Integrating smart technologies and nanomaterials to promote sustainable construction in Saudi Arabia's building sector

Integrating smart technologies and nanomaterials to promote sustainable construction in Saudi Arabia's building sector | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Systematic Review Integrating smart technologies and nanomaterials to promote sustainable construction in Saudi Arabia's building sector Shukri Elbellahy This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9342985/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 12 You are reading this latest preprint version Abstract Saudi Arabia’s commitment to achieving net‑zero emissions by 2060 has positioned the building sector—one of the Kingdom’s highest energy-consuming industries—as a priority for decarbonization. This review synthesizes recent research on the integration of nanomaterials and smart technologies to support sustainable construction in hot arid regions, with a focus on the Saudi context. Nanomaterials, such as nano‑enhanced concrete, coatings, glazing, and insulation, demonstrate significant potential to improve structural durability, reduce thermal loads, and lower life-cycle environmental impacts. At the operational level, smart technologies—including Internet of Things (IoT)-enabled systems, Artificial Intelligence (AI)-driven controls, digital twins, and advanced building management systems—enable real‑time optimization and predictive maintenance, with evidence from Saudi case studies showing energy savings of up to 30%. Despite these benefits, adoption within the Kingdom remains limited due to data gaps, high upfront costs, regulatory uncertainty, interoperability challenges, and shortages in specialized skills. The analysis highlights opportunities to strengthen performance, enhance energy efficiency, and support climate resilience, while emphasizing the need for improved risk assessment, localized cost–benefit studies, and clearer regulatory pathways. The study concludes with strategic recommendations addressing standardization, capacity building, and lifecycle‑based decision frameworks to accelerate the integration of these technologies. By bridging critical knowledge gaps and aligning with Saudi Vision 2030 sustainability objectives, the combined use of nanomaterials and smart systems offers a viable pathway toward high‑performance and low‑carbon buildings in Saudi Arabia. Nanomaterials Smart technologies Sustainable Construction Building Energy Efficiency Saudi building sector Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 1 Introduction 1.1 Background The global shift toward sustainability has intensified in recent years as nations confront accelerating environmental challenges, including climate change, global warming, and the depletion of natural resources. The building sector plays a central role in these challenges due to its substantial consumption of energy and materials throughout a building’s life cycle. In Saudi Arabia, the magnitude of this impact is particularly significant: the building sector accounts for 29% of total raw energy consumption and more than 75% of electricity use, with an annual growth rate of 7.2% [1]. Residential buildings alone represent approximately half of national electricity demand [2], largely driven by cooling requirements in hot summer months, where air conditioning loads can reach up to 65% of household energy use. At the global level, the urgency of intervention is underscored by the fact that the building sector accounted for 34% of total CO₂ emissions in 2023, making it the largest single source of energy-related emissions [3]. Additionally, embodied carbon associated with construction materials represents up to 39% of global energy-related carbon emissions [4]. Recognizing these pressures, Saudi Arabia has committed to achieving net-zero greenhouse gas emissions by 2060, supported by expanded deployment of renewable energy, carbon capture solutions, and systematic improvements in building-sector energy efficiency [2]. This transition is embedded within the Kingdom’s broader transformation under Saudi Vision 2030 [5], which seeks to modernize national infrastructure, promote digital technologies, and integrate sustainability into all economic sectors, including construction. Despite these national commitments, many existing buildings in Saudi Arabia remain inadequately adapted to the region’s harsh climatic conditions. Common deficiencies include limited use of climate-responsive design strategies, inefficient building envelopes, and continued reliance on outdated or low-efficiency electrical systems and cooling technologies. To address these inefficiencies, the Saudi Energy Efficiency Center (SEEC) has launched extensive programs to establish performance standards, enhance public awareness, and promote the adoption of energy-efficient materials and appliances [6]. These initiatives target the building sector’s share of approximately 30% of total national energy consumption, highlighting the critical need for improved building performance at scale. Material selection represents another essential dimension of sustainable construction in the Kingdom. Green building materials—characterized by durability, recyclability, and low environmental impact—play a pivotal role in improving building performance, reducing lifecycle costs, and meeting certification requirements such as those of the Saudi Green Building Forum and LEED. Architects and engineers increasingly recognize that material choices influence not only structural integrity but also long-term environmental performance and user comfort [7]. In parallel, emerging advances in nanotechnology and smart technologies offer new pathways to significantly enhance building performance through improved thermal regulation, reduced energy consumption, and enhanced durability. These innovations are particularly relevant in hot arid regions, where extreme temperatures impose substantial energy demands and challenge conventional building systems. Against this backdrop, Saudi Arabia is experiencing a transformative shift in its construction practices, driven by national sustainability goals, rapid digital transformation, and the region's unique climatic challenges. Recent studies emphasize the potential of integrating nanomaterials and smart technologies to tackle key issues such as desertification, resource scarcity, and rising energy demands. The combination of material-level innovations (e.g., nano-enhanced concrete, coatings, glazing, and insulation) with building-scale intelligent systems (e.g., IoT platforms, AI-driven controls, and digital twins) offers a promising path toward high-performance, low-carbon buildings aligned with Vision 2030 objectives. Therefore, this background provides the foundational context for this study: a rapidly evolving construction sector where environmental needs, climate conditions, and technological advancements intersect. It highlights the importance of thoroughly examining how nanomaterials and smart technologies can be strategically integrated to support sustainable, resilient, and future-ready buildings in Saudi Arabia. 1.2 Literature review Many prior articles have explored nanomaterials and smart technologies in construction, focusing on their impacts, benefits, challenges, and opportunities in architecture, building performance, and infrastructure. Others proposed indicators for the use of nanomaterials, developed sustainability assessment methods, and created matrices to compare alternatives to traditional materials. Another study explored Smart Building Technology in Saudi Arabia and the Gulf, including terminology, expertise, and lifecycle challenges. Table 1 summarizes prior findings on nanomaterials and smart technologies in the building sector. Table 1 summarizes previous research on nanomaterials and smart technologies in the building sector. Study No. Objectives Methodology Results [8] Review of nanomaterials in construction and finishing materials, with an emphasis on their application within architecture, their impact on building performance, and their associated benefits. A review of academic publications related to Nanomaterials and their applications in the construction industry was conducted. It helps create efficient, cost-effective buildings with unique designs and visual appeal by selecting suitable nanomaterials and application areas. Greater awareness of modern and nanotechnologies enhances building performance. [9] Explores the role of nanotechnology and nanostructures in reaching the UN Sustainable Development Goals (SDGs). An exhaustive review of research literature and data from various sources. Harnessing nanotechnology's potential enables policymakers, researchers, and stakeholders to collaborate for a sustainable future and achieve the 17 UN Sustainable Development Goals. [10] Explores how nanomaterials in housing construction impact technical and structural aspects. Review of academic publications on Nanomaterials in construction. Nanomaterials improve construction materials by boosting durability and strength by over 20%, reducing thermal conductivity, enabling self-cleaning, and enhancing various properties. [11] Performs a comprehensive review and recommends suitable indicators for the use of nanomaterials in construction. Reviewing standards for traditional materials and bibliometric networks in nanomaterial research. A review of nanomaterials and European standards highlights the need for mandatory environmental, human health, and economic indicators for their use in construction. [12] Develop a method to evaluate the sustainability of nanomaterials in construction, focusing on four key sustainability aspects. Explore the fundamentals of nanotechnology and its link to sustainable architecture, reviewing key nanomaterials, their effectiveness, and applications. Incorporating nanomaterials into construction enhances building materials, promotes sustainable architecture, and reduces carbon emissions. [13] Develop an evaluation matrix for nanomaterials based on a "sustainable/economic" scale to compare and select alternatives within the same field, in contrast to traditional materials. Analyses nanomaterials for sustainability, sets criteria, and creates a "sustainable/economic” tool to compare options. Provide an evaluation matrix for material sustainability and economics, divided into four zones, using nano-thermal protection materials as an example for sustainable building design. [14] Analyze smart building technology, terminology, and expertise in Saudi Arabia and the Gulf. The study also examines lifecycle challenges. A literature review, a pilot test, and a survey of 90 architects, engineers, managers, and contractors. Enhance the understanding of building construction professionals by providing insights into the challenges associated with the adoption of Smart Building Technology. 1.3 Data gaps Recent literature (2020–2026) has identified data gaps in the application of nanomaterials and smart technologies in the building construction sector, both globally and in Saudi Arabia. Table 2 summarizes data gaps in the application of nanomaterials and smart technologies in the building construction sector. Table 2 summarizes data gaps in the global application of nanomaterials and smart technologies, as well as in the Saudi building sector. Gap Area Global Context Saudi Context Implications Economic Feasibility Lack of direct cost-benefit data for nanomaterials [15] No localized cost studies [15] (prices, supply chains, dust/soiling conditions, labor) Capital budgeting under uncertainty, Limits investment decisions Health & Environmental Risk Inadequate nanoparticle risk data (chronic exposure, transport, end‑of‑life) [16] No local risk assessment protocols (exposure assessment, monitoring, waste handling) Risks for worker safety and slow adoption rates. Data Standardization Lack of universal DT/BIM standards [17], no common schemas for exchanging envelopes, sensors, and lifecycle data across design, construction, and operations. Undefined BIM data exchange methods [18], and limited interoperability across public and private platforms. Poor interoperability, higher integration costs, and data silos. Integration Frameworks Fragmented tech adoption [19]; isolated pilots (BIM, blockchain, IoT, DT) rather than integrated delivery and operations frameworks. Isolated BIM/Blockchain initiatives without codified materials‑plus‑intelligence frameworks in KSA guidance [18, 20]. Reduced synergy and benefits. Skills & Training Education gaps in emerging technologies [19] Shortage of skilled personnel [18] Slower adoption, O&M performance drift 1.4 Research objectives This study explores how nanomaterials and smart technologies can promote sustainable construction in Saudi Arabia by reviewing recent advancements in nano-enhanced materials and smart systems for hot, arid conditions. It identifies technical, economic, and regulatory gaps impacting their adoption domestically and globally. The study analyzes Saudi case studies to quantify energy, comfort, and lifecycle improvements, evaluates alignment with national strategies like Saudi Vision 2030, and develops an integration framework to standardize adoption, enhance skills, and inform lifecycle decisions. These objectives outline a focused approach to using materials and smart solutions for low-carbon, high-performance buildings in Saudi Arabia. 1.5 Importance of this research This article presents a novel, integrated approach to sustainable construction by combining nano-enhanced materials with smart, data-driven technologies. It introduces a 'materials-plus-intelligence' framework that connects improvements in nanomaterials to operational optimization through IoT, AI, digital twins, and advanced building systems. The study highlights that these technologies can reduce energy use by up to 30% while enhancing durability, comfort, and lifecycle efficiency, using recent Saudi case studies. Key contributions include synthesizing nanomaterials and smart tech into a model, identifying data gaps and barriers, evaluating Saudi projects' outcomes, and offering strategic recommendations for policy, standardization, capacity building, and lifecycle design. These efforts support Saudi Vision 2030’s goal of high-performance and low-carbon buildings. 2 Methodology This study employs a systematic, structured literature review to analyze the integration of nanomaterials and smart technologies in sustainable construction, with particular focus on hot arid regions and the Saudi Arabian building sector. The review follows a multi-stage process that ensures rigor, transparency, and relevance, as shown in Fig. 1 . Google Scholar and ScienceDirect (including the ScienceDirect AI/ LeapSpace assistant for query refinement and article surfacing) were used to identify articles and pertinent data. First, a search strategy was developed to identify peer-reviewed studies, empirical research, and technical reports published over the past 12 years (2014–2026), with emphasis on recent advancements in materials science, smart systems, and sustainable building technologies. Key primary sources comprised academic bibliographic databases and scholarly and scientific platforms, which were queried using targeted keywords related to nanomaterials, smart buildings, Saudi construction, PCM, insulation materials, and smart city applications. Inclusion criteria (Filters) prioritized: English‑language publications; primary studies, systematic reviews, meta‑analyses, and high‑quality modeling/empirical studies; peer‑reviewed journals prioritized. Grey literature (policy/technical reports) was considered only to contextualize Saudi‑specific implementation barriers/enablers and was not used for quantitative synthesis. Add to that, studies offer quantitative or qualitative insights into material performance, energy efficiency, environmental impact, or technological integration. Non-peer-reviewed sources, insufficiently detailed conference abstracts, non‑building contexts (e.g., unrelated nanomedicine, electronics) without clear transferability to buildings, opinion pieces, editorials, and non‑scholarly blog posts were excluded to maintain methodological rigor. Hundreds of studies in literature were reviewed for relevance, validity, data quality, and alignment with the study objectives. Ultimately, only 88 studies were included. Data extraction and synthesis were conducted through thematic analysis, which enabled the identification of key research trends, performance insights, data gaps, and adoption barriers. The process included organizing studies into material-level innovations, building-scale smart technologies, and urban-level infrastructure systems, followed by evaluating their collective implications for the Saudi context. The methodological workflow and the research structure are illustrated in the research process diagram in Fig. 2 . This systematic approach ensures that the findings are evidence-based, comprehensive, and aligned with contemporary advancements in sustainable construction. 2.1 Assumptions & Limitations a) Assumptions: The performance and sustainability benefits of nanomaterials and smart technologies are generalizable across diverse urban contexts. Cost and risk data are based on current market and regulatory conditions, which may evolve. b) Limitations: Long-term health and environmental impacts of nanomaterials remain underexplored due to limited chronic exposure studies. Smart technology adoption is context-dependent, with varying levels of digital infrastructure and public acceptance. Data gaps exist in life cycle assessments and standardized risk evaluation protocols for both domains. 3 Sustainable construction Sustainable construction represents a comprehensive approach to planning, designing, constructing, and operating buildings that minimizes environmental impact, enhances social well‑being, and ensures long‑term economic efficiency. Given the growing environmental pressures—particularly in hot, arid regions such as Saudi Arabia—sustainable construction has become a central strategy for transforming the built environment. Within this frame, the sector’s multidimensional complexity—spanning buildings, infrastructure, industrial facilities, renovation activities, and demolition—requires coordinated engagement among diverse stakeholders, including architects, engineers, regulators, developers, suppliers, and financiers. This interdependence underscores the need for comprehensive frameworks that embed sustainability principles across all project phases rather than addressing environmental performance as an isolated design consideration. As global environmental challenges intensify, traditional construction practices have become insufficient for achieving the emissions reductions required to meet national and international sustainability targets. In response, contemporary sustainable construction strategies should increasingly encourage the integration of innovative materials, advanced digital technologies, and performance‑driven design practices. The following section presents a summary of opportunities and challenges for integrating nanomaterials and smart technologies at the levels of building materials and the urban context. 3.1 Material-level innovations. The integration of nanomaterials and smart technologies at the level of building materials is a fundamental driver of modern sustainable construction. This approach enhances the physical, mechanical, thermal, and functional performance of building components while enabling responsive and resource‑efficient building operation. Together, these innovations support higher durability, improved energy efficiency, and better environmental performance. The subsequent section focuses on nanomaterial integration into base construction materials, such as concrete, coatings, glazing, and insulation. Concrete is vital for construction, but it causes environmental issues like CO 2 emissions and resource depletion. Sustainable concrete, using alternative materials and innovative methods, has emerged to improve performance and reduce impact [ 21 ]. Recently, attention has focused on nanomaterials to enhance concrete [ 22 ], with nanoparticles listed in Table 3. Table 3 outlines the functions of nanoparticles used in concrete mixtures. Nanoparticles Purpose Nano-SiO 2 Rapid hydration, improved mechanical strength, and increased durability Nano-TiO 2 Photocatalytic and photovoltaic properties; increased hydration level, enhanced mechanical strength, and improved durability. Nano-Alumina (Nano-Al 2 O 3 ) Enhancing mechanical properties and increasing the compactness of the interfacial transition zone (ITZ). Carbon nanotube Mechanical, self-sensing & self-healing Nano-Fe 2 O 3 Abrasion resistance enhances compressive strength. Nano clays Enhance surface roughness and improve compressive strength. Recent studies show that nanomaterials enhance cementitious systems [ 23 ], improving their properties, durability, and microstructure while accelerating hydration. Nano-modified concrete exhibits improved strength, reduced water absorption, and enhanced resistance to heat and radiation, making it suitable for self-healing and 3D printing. Addressing health and environmental challenges is essential. New methods can support resilient and sustainable construction [ 21 ]. 2. Nano coatings are 1 to 100 nanometers thick [ 23 ], serve as ultra‑thin protective layers that enhance mechanical strength, corrosion resistance [ 22 ], surface hygiene, and UV durability. Their densely packed nanostructure prevents dirt and moisture penetration and provides self‑cleaning, antibacterial, and anti‑scratch functionalities. From a cost‑effectiveness perspective, nano‑coatings outperform traditional coatings by extending service life threefold and reducing repainting cycles by more than a decade [ 21 ], making them one of the highest‑ROI envelope innovations [ 24 ]. Environmental risks associated with nanoparticle persistence remain a regulatory gap, yet compared with PCMs or aerogels, nano‑coatings exhibit lower integration complexity and broader applicability across façades, interior surfaces, and PV modules. (3) Smart glass refers to advanced glazing technologies that can automatically or actively modify their tint, opacity, and transparency in response to external stimuli such as light, heat, or electricity. This capability allows buildings to control sunlight, glare, heat gain, and indoor brightness, improving both comfort and energy efficiency. There are three major categories of smart glass: Photochromic Glass (Passive Smart Glass) Adjusts tint automatically based on sunlight intensity. Darkens in bright light and becomes clear in low light. Ideal for large windows but lacks manual control. Thermochromic Glass (Passive Smart Glass) Reacts to temperature changes. Tints when exposed to high temperatures to reduce heat gain and glare. Becomes clearer in cooler conditions, maximizing natural daylight. Supports lower HVAC demands and better indoor comfort. Electrochromic Glass (Active Smart Glass) changes transparency through low‑voltage DC electricity. Helps regulate sunlight and heat, reducing electricity use by 75% and natural gas consumption by 60%. Improves safety, acoustics, and thermal stress resistance. Light transmittance shifts from 60% (clear) to 18% (tinted). Compared to passive photochromic and thermochromic systems, which are simpler and more cost‑effective, electrochromic glazing delivers superior adaptability, making it more suitable for high‑performance buildings and regions with extreme solar gain. However, integration costs and durability remain adoption barriers, especially compared with simpler envelope upgrades. 3. Insulation materials improve thermal regulation, cut energy use, and reduce CO 2 emissions, with advantages that vary according to climate and strategy [ 25 ]. Challenges include high costs, unpredictable performance, implementation issues, and limited applications. The paragraph below describes two types of smart insulation materials: a. Aerogel provides one of the highest insulation efficiencies among building materials due to its extremely low density and high porosity (95% air). In hot‑arid climates, aerogels deliver exceptional thermal resistance, acoustic dampening, and moisture stability while maintaining minimal thickness requirements. Compared to PCMs, aerogels provide more consistent passive insulation without performance degradation over time. However, their high manufacturing costs limit large‑scale deployment. While nano‑coatings enhance durability and smart glass controls solar gain, aerogels represent the most effective single material for reducing conductive heat transfer, especially in retrofits where wall thickness is constrained. b) Phase Change Material (PCMs) effectiveness relies on their thermophysical, chemical, and economic attributes, as illustrated in Fig. 3 . PCMs enhance building thermal storage by absorbing and releasing heat during phase transitions, effectively smoothing indoor temperature fluctuations, reducing peak cooling loads by 1–10°C, and offering up to six‑fold increases in thermal storage capacity [ 26 ]. Their payback period (4–10 years) is competitive with smart glass and often more favorable than aerogels[ 26 ]. However, PCMs face challenges such as low thermal conductivity, flammability, and material incompatibility [ 26 ]. Compared with aerogels, which offer steady-state insulation, PCMs excel at dynamic thermal regulation, making them ideal for climates with large diurnal temperature swings—but require careful integration to avoid performance degradation. 4. Building Integrated Photovoltaics (BIPV) embeds solar panels into buildings, turning surfaces into energy sources while maintaining aesthetics [ 27 ]. It replaces traditional materials on roofs, skylights, or facades, serving as both a building element and a power generator [ 28 ]. Nanoscale BIPV employs nanotechnology to enhance performance and aesthetics, offering more efficient and attractive solar options. Figure 4 illustrates the benefits of BIPV [ 30 ]. BIPV solutions consist of PV skylights, PV curtain walls, PV claddings, PV canopies, PV pavements, louvers, and balustrades [ 27 ]. Photovoltaic (PV) system efficiency is hindered by soiling, particularly in desert environments, where dust reduces light and increases maintenance costs [ 29 ]. Nano-coatings can cut soiling, boost light absorption, and increase energy yield [ 29 ]. An experiment showed that dust reduces BIPV power, whereas hydrophilic Nano coatings increase power by 18% relative to wiping and reduce the payback period to 3.9 years [ 31 ]. Overall, nano‑coatings and smart glass offer the most immediate and scalable energy savings, whereas aerogels and PCMs provide high-performance solutions better suited to specialized applications or advanced building envelopes. The strategic combination of these materials—linking passive insulation (aerogels, PCMs) with active envelope control (smart glass) and durability enhancements (nano‑coatings)—forms a synergistic pathway toward achieving high‑performance and low‑carbon buildings. Although the above innovations are reshaping the sustainability landscape by enabling reductions in energy use, lowering lifecycle costs, and improving resilience to extreme climatic conditions, many challenges remain in their application. Table 5 provides a summarized, evidence-based comparative overview of the pros and cons of nanomaterials and smart technologies, equipping decision-makers with the insights needed for informed adoption in building and urban contexts [ 32 ]. Table 5 provides an overview of the pros and cons of nanomaterials and smart technologies. Dimension Nanomaterials: Pros Nanomaterials: Cons Smart Technologies: Pros Smart Technologies: Cons Performance Enhanced strength, durability, and functionality. Self-cleaning, antibacterial, UV protection [ 33 ]. Improved energy efficiency and resilience. Long-term aging and degradation, agglomeration and dispersion problems - Real-time monitoring and adaptive control, Improved operational efficiency and comfort, Enhanced safety and security - System compatibility and interoperability issues - Potential for system failures and technical complexity Sustainability Reduced energy use and carbon emissions [ 34 – 35 ] - Extended lifespan of materials - Potential for green/recycled nanomaterials Energy-intensive production - Environmental persistence and toxicity - Disposal and recycling challenges Energy and resource savings (up to 30% reduction) [ 32 , 36 – 38 ] - Waste reduction and environmental management - Supports net-zero and green goals - Electronic waste generation - Digital divide and access inequities - Data center energy use Cost - Long-term savings via durability and reduced maintenance [ 39 – 40 ] - Material savings - High initial production and integration costs - Limited industrial experience Reduce operational costs (up to 20%) [ 32 , 36 , 37 , 38 ]- Increased property values - High upfront investment - Ongoing maintenance and upgrade costs [ 41 – 42 ]. Safety Potential for safer, more resilient structures - Health risks (toxicity, chronic exposure) - Regulatory gaps - Occupational hazards - Improved physical safety (e.g., surveillance, alarms) - AI-driven threat detection - Cybersecurity threats - Privacy risks - Data breaches and misuse [ 43 – 44 ] Implementation - Enables smart, adaptive infrastructure - Supports circular economy with recycled nanomaterials - Regulatory and standardization challenges - Need for comprehensive risk management - Limited long-term data - Scalable with open standards - Enables citizen engagement and participatory governance - Stakeholder engagement and public acceptance hurdles - Data governance and trust issues. Generally, nanomaterials provide notable performance improvements, such as greater strength and durability, and additional functions, including self-cleaning and antibacterial properties, which result in longer lifespans and energy savings in building components, but they also entail higher production costs and potential health and environmental risks. Also, smart technologies offer efficiency gains through real-time monitoring, lower costs via energy optimization, and better security systems; however, they also introduce challenges related to cybersecurity, data privacy, interoperability, and high initial capital costs. 3.2 Building‑/district‑scale Smart systems The integration of nanotechnology and smart technologies into urban infrastructure is transforming city systems by embedding advanced materials and sensors, which enhance the management and operation of transportation networks, energy grids, and building systems. This integration leads to improved efficiency, real-time monitoring, predictive maintenance, and intelligent decision-making, all of which contribute to more sustainable, resilient, and livable cities. Nevertheless, the incorporation of nanomaterials and intelligent technologies into urban infrastructure bears technological, environmental, economic, and social implications as delineated below. Technological impacts : The integration of nanomaterials and smart technologies into urban infrastructure has led to significant advancements in material performance, real-time monitoring, and intelligent decision-making [ 45 – 47 ]. Smart technologies, including the Internet of Things (IoT), artificial intelligence (AI), big data analytics, and digital twins, enable real-time monitoring, predictive maintenance, and intelligent management of infrastructure systems [ 46 – 47 ]. These technologies optimize resource use, enhance public safety, and support efficient decision-making before, during, and after hazards such as floods. The integration of nanotechnology with AI and IoT further enhances infrastructure resilience and functionality. Environmental impacts : Nanomaterials and smart technologies support environmental sustainability by lowering carbon emissions, boosting energy efficiency, and improving pollution control. Quantitative results show up to a 30% reduction in carbon emissions and a 25% increase in energy performance through nano-enhanced materials [ 45 – 46 ]. Smart city technologies, including ICT, IoT, and smart mobility systems, enhance energy efficiency in buildings and transportation, reducing greenhouse gas emissions and improving air quality [ 45 – 46 ]. They also promote water conservation through leak detection and optimized distribution and enhance waste management by increasing recycling rates and reducing waste produced. Nevertheless, the production of electronic devices for smart technologies can produce electronic waste and environmental damage if not managed responsibly, underscoring the necessity for sustainable solutions and appropriate management. Economics impacts : The adoption of nanomaterials and smart technologies in urban infrastructure can lead to economic benefits such as reduced operational costs, improved efficiency, and increased asset longevity [ 45 – 46 ]. Smart mobility and intelligent transport systems support economic competitiveness by minimizing disruptions to economic activity and improving access to essential goods and services [ 46 , 48 ]. Despite these benefits, challenges such as high implementation costs, production scalability, and integration with existing infrastructure remain significant barriers to widespread adoption [ 45 , 47 ]. Social impacts : The integration of nanomaterials and smart technologies into urban infrastructure can enhance quality of life, promote social equity, and encourage community engagement [ 45 – 47 , 49 ]. Smart city initiatives aim to enhance public services, mobility, and resource efficiency, benefiting the entire community and reducing digital divides. Open big data analysis and transparent governance can increase public trust in government and support inclusive urban innovation. However, there are concerns about privacy and data security, as well as the potential for reduced human engagement with nature due to increased reliance on technological solutions [ 47 ]. Robust data governance frameworks and stakeholder collaboration are necessary to balance technological innovation with ethical and social considerations. Additionally, the deployment of clean technologies and improved living conditions can increase the welfare of marginalized urban populations, promoting comprehensive economic and social development. However, integrating nanomaterials with smart technologies in urban infrastructure is multifaceted. Table 6 summarizes the key insights, challenges/risks, and opportunities/recommendations concerning the impact dimension of integrating nanomaterials with smart technologies in urban infrastructure. Table 6 summarizes key insights, challenges/risks, and opportunities/recommendations on integrating nanomaterials with smart tech. in urban infrastructure. Dimension Key Insights Challenges / Risks Opportunities / Recommendations Technological Nanomaterials (e.g., nano‑silica, nano‑TiO₂) and smart systems (IoT, AI, blockchain) enhance infrastructure adaptability, durability, and automation. Scalability limitations, interoperability issues with legacy systems, cybersecurity risks, and regulatory gaps. Advance green synthesis methods; adopt modular/open digital architectures; develop unified standards to enable scalable integration. Environmental Nanomaterials enhance durability, reduce pollution, and increase resilience; smart green infrastructure promotes climate-adaptive operations. Long-term ecological risks: including nanoparticle accumulation, soil/water toxicity, and uncertain end‑of‑life behavior. Establish comprehensive risk‑assessment protocols; pair engineered systems with nature‑based solutions to mitigate ecological impacts. Economic Long-term savings via durability, reduced maintenance, and operational efficiency. Blockchain improves transparency. High initial costs, regulatory uncertainty, and limited field-scale cost-benefit analyses. Use public–private partnerships; create standardized evaluation frameworks; employ digital twins to optimize the economy. Social Support citizen-centric innovation, ethical governance, and participatory models that foster trust and inclusivity. Digital gaps, privacy concerns, algorithmic bias, and inconsistent public acceptance. Implement inclusive design guidelines; strengthen data governance; establish urban living labs to build trust and accelerate adoption. 4 Saudi Arabia's construction sector 4.1 Sustainability strategies The building sector in Saudi Arabia is experiencing significant changes aligned with the Kingdom’s Vision 2030, guided by the following key strategies, as illustrated in Fig. 5 . Adopting green building materials enhances energy efficiency, reduces maintenance costs, and complies with the Leadership in Energy and Environmental Design (LEED) system and Saudi Green Building Forum standards by using eco-friendly, recyclable, and durable materials with minimal environmental impact. Achieving energy efficiency through reducing consumption and emissions to meet environmental goals. Key measures include solar panels, efficient lighting, and smart systems. Achieving water efficiency involves minimizing water use, reusing wastewater, conserving energy, and reducing costs. Water conservation is vital for Saudi Arabia’s sustainability in its arid climate. New technologies such as rainwater harvesting, greywater recycling, smart appliances, water-efficient fixtures, and irrigation systems significantly reduce water consumption. Renewable energy sources integration: Saudi Arabia, guided by Vision 2030, seeks to diversify its energy mix and boost renewables like solar, wind, and hydrogen to 50% through on-site and off-site sources by 2030. Building-Integrated Photovoltaics (BIPV) substitutes conventional building elements with photovoltaic (PV) modules, thereby enhancing both energy generation and aesthetic appeal. BIPV facilitates the production of renewable energy, serves as a protective barrier, reduces overall costs, and minimizes installation expenses compared to traditional panels. Consequently, these benefits render BIPV advantageous for applications such as skylights, railings, and other areas. While BAPV modules are integrated into building elements, they expand space and convert solar energy for residential use [ 50 ]. Waste reduction: Emphasizing the importance of reducing construction waste through the promotion of modular and prefabricated buildings, as well as recycling and reusing materials, to lessen environmental impact, decrease waste, and accelerate project timelines. 4.2 Sustainable construction: Key drivers Green building (GB) practices aim to mitigate CO 2 emissions and reduce energy consumption [ 51 ] while complying with sustainability principles, namely economic, social, and environmental considerations. The main drivers leading green construction encompass economic, environmental, social, regulatory, and technological factors that motivate stakeholders to adopt sustainable methods. For example, Saudi Arabia’s Vision 2030 and government initiatives focus on promoting sustainable construction. Moreover, growing environmental awareness among decision-makers, construction industry leaders, and building practices provides long-term savings through energy and water conservation, while waste management emphasizes reducing, reusing, and recycling construction and demolition waste to lower environmental impact. 4.3 Efforts for Sustainable Construction in KSA Saudi Arabia's Vision 2030 promotes sustainable construction to diversify the economy and improve living standards. It promotes the integration of nanomaterials and intelligent technologies to tackle challenges related to the hot arid climate, energy, and economic development. Saudi Arabia’s construction sector is at the forefront of integrating nanomaterials and intelligent technologies to address the intertwined challenges of hot arid climates, energy efficiency, and economic development. Case studies and simulation analyses consistently demonstrate substantial energy savings, improved indoor comfort, and positive economic impacts. The Schematic Table 7 summarizes Saudi building projects that integrate nanomaterials and intelligent technologies to address the challenges of the hot arid climate, energy, and economic development. These projects demonstrate energy savings (up to 30%), improved indoor comfort, and economic benefits such as reduced lifecycle costs and support for national sustainability initiatives [ 52 – 58 ]. Table 7 summarizes Saudi building projects that integrate nanomaterials and intelligent technologies. Project/Location Climate Adaptation Strategies Nanomaterials Used Intelligent Technologies Measured Outcomes (Energy/Economic) Riyadh Residential Compound Adaptive facades, optimized envelope electrochromic glass Smart facade controls 30% HVAC energy reduction; improved comfort [ 53 ] Case studies in Riyadh Commercial/Residential HVAC optimization, building orientation, window placement, and insulation materials HVAC improvements, Nano-insulation, Digital tools (BIM-PMBOK–ML) framework 13–15% energy savings; 20–25% GHG emission reduction [ 54 ]. NEOM Smart City passive-based techniques (Dynamic shading, PCM, PV integration) 5–20 cm insulation (PCM) Digital tools Reduced heat exchange by 63.5% in PCM-filled building envelopes [ 56 ]. Saudi Commercial Buildings Building envelope optimization - Nanogel glazing - Nano vacuum insulation panel (VIP)- Digital tools (Autodesk Revit, Ecotect software) 14.5–14.8% energy savings; short payback [ 58 ]. Moreover, Saudi Arabia's Vision 2030 and National Transformation Program (NTP) prioritize smart cities and infrastructure, making smart buildings a key focus for the industry. Government support for sustainability and technology fosters the growth of smart buildings. The focus aligns with Vision 2030 by incorporating IoT, AI, and big data into urban planning to improve city flow, boost energy efficiency, and promote economic diversity, livability, and sustainability. Several important factors underscore the significance of smart cities in Saudi Arabia, such as: Smart cities enhance economic diversity through the attraction of technology companies, startups, and innovation sectors, thereby fostering research and development, entrepreneurship, and knowledge-based industries. Saudi Arabia’s smart cities prioritize environmental sustainability, featuring eco-friendly infrastructure, waste management systems, renewable energy sources, and lowered emissions. They also improve residents’ quality of life through advanced transportation, smart healthcare, and digital education. Additionally, the influence of cities on urban life is profound, transformative, and multifaceted as follows: Connectivity: High-speed internet facilitates remote access. Safety: Security systems improve public safety. Mobility: Smart cities offer efficient transport, decreasing pollution and congestion. Economic Growth: Tech companies and startups drive growth and jobs. The subsequent paragraph presents examples of intelligent cities and districts in the Kingdom of Saudi Arabia, highlighting major projects featuring buildings that integrate smart technologies. King Abdullah Financial District (KAFD) – Riyadh: KAFD exemplifies a smart district with buildings and infrastructure using smart tech. Features include LEED Platinum sustainable design, energy-efficient facades, solar panels, and smart HVAC. An underground waste system reduces energy consumption by 50% and emissions by 90% [ 59 ]. Climate-controlled skywalks and monorails support pedestrian access [ 59 ]. NEOM Megaprojects : NEOM is building smart cities like The Line, Oxagon, and Trojena with AI, IoT, high-efficiency materials, and digital twins for real-time monitoring. They aim to boost energy efficiency, automate services, and achieve zero-carbon targets, demonstrating Saudi Arabia’s smart-city and environmental goals. Key highlights include Innovation and Sustainability: NEOM is an eco-friendly city powered by renewable energy. It highlights impressive green infrastructure and an advanced water technology system, all working together to create a sustainable, innovative community. Robots will enhance residents’ lives [ 60 ]. It's a flexible regulatory framework that supports autonomous transportation and AI. The Line City exemplifies future urban development, balancing innovation with climate resilience. Success hinges on managing construction impacts, environmental risks, and scalability [ 61 ]. Mohammed Bin Salman Nonprofit City – Riyadh: This development is a smart nonprofit city for education and innovation, featuring Smart Concrete with sensors, Technology-Ready Infrastructure, and AI-powered Smart Classrooms for campus management and learning. 4.4 Nanomaterials and Smart Technologies Adoption: Opportunities and Challenges The Saudi construction industry can adopt adaptive nanomaterials and smart technologies, guided by Saudi Vision 2030 and giga projects such as NEOM. Opportunities to leverage adaptive nanomaterials and smart technologies in Saudi Arabia's building sector are robust, with recent global advances demonstrating significant potential for energy efficiency, dynamic environmental response, and durability enhancement. However, to fully capitalize on these innovations, Saudi Arabia must overcome technical and organizational barriers by developing updated policy frameworks aligned with Vision 2030 and by conducting interdisciplinary research that integrates digital transformation with materials science [ 62 – 63 ]. Table 8 summarizes the current status, opportunities, challenges, gaps, future directions, and recommendations for integrating nanomaterials and smart technologies in the Saudi construction sector. Table 8 summarizes the current status, opportunities, challenges, gaps, future directions, and recommendations for integrating nanomaterials and smart technologies in the Saudi construction sector. Theme/Area Current Status & Opportunities Challenges & Gaps Future Directions & Recommendations Adaptive Nanomaterials Improve durability, self-healing, and energy efficiency in building materials [ 64 ]. High cost, fire/toxicity risks, limited long-term data, scalability constraints [ 65 – 67 ]. Conduct localized performance evaluations; support regulatory frameworks; enhance interdisciplinary R&D. [ 68 – 69 ]. Smart Technologies (IoT, BIM, Digital Twins) Enable real-time monitoring, predictive maintenance, and improve operational efficiency [ 70 – 72 , 62 ]. Interoperability issues; infrastructure readiness, skills gaps, cybersecurity vulnerabilities [ 74 ], [ 74 ]. Upskill Workforce, strengthen leadership and governance models, and adopt open digital standards [ 76 ]. Policy & Vision 2030 Alignment Strong national push toward digitalization and sustainability; incentives for smart technologies [ 76 – 77 ]. Absence of clear guidelines for nanomaterial adoption; inconsistent regulatory frameworks. [ 78 – 79 ]. Embed material‑tech integration in building codes; support green‑transition incentives [ 79 – 80 ]. Hot Arid Climate Adaptation PCMs, aerogels, and biomimetic facades reduce cooling loads and improve comfort [ 65 , 81 ]. Economic feasibility concerns and limited market readiness [ 82 ]. Pilot projects, simulation-based research, and local material optimization [ 83 – 84 ]. Organizational & Social Factors Leadership engagement and management support critical for adoption [ 73 ]. Cultural resistance, high upfront costs, and lack of public awareness [ 85 – 86 ]. Awareness campaigns, stakeholder engagement, and financial incentives for sustainable technologies [ 87 ]. Interdisciplinary Approaches Recognized as essential for delivering integrated sustainable solutions [ 68 , 69 ]. Limited multi-sector collaboration and insufficient integration across academia, industry, and government. [ 32 ]. Foster structured partnerships; develop joint research platforms; integrate materials, digital technologies, and policy domains [ 68 , 18 ]. 5 Results Nanomaterials enhance the properties of core building components, densify the microstructure in cement, and improve durability. Nano-coatings create long-lasting barriers against dirt, moisture, UV radiation, and chemicals, reducing maintenance requirements. Envelope Technologies and Thermal Regulation: Smart glazing controls solar gain, lowering HVAC needs. Advanced insulation, such as aerogels and PCMs, stabilizes indoor temperatures; PCMs enhance thermal storage and reduce peak temperatures (~ 1–10°C), with payback in ~ 4–10 years. Renewable integration in desert conditions reveals that building‑integrated photovoltaics (BIPV) remain effective even under soiling challenges typical of desert environments. Hydrophilic nano‑coatings boost PV output by 18%, resulting in a 3.9-year cost-recovery period. Operational enhancements through smart systems—such as IoT sensors, Building Management Systems (BMS), AI analytics, and digital twins—support real-time monitoring, adaptive controls, predictive maintenance, and better decision-making. These advancements contribute to improved energy performance and service quality at both the building and district levels. Operationally , IoT‑based sensing, AI analytics, and digital‑twin control systems enhanced building responsiveness through real‑time monitoring, adaptive HVAC regulation, and predictive maintenance — collectively improving energy efficiency, indoor environmental quality, and overall system resilience. Quantitative Outcomes and Saudi Evidence: Synthesis across sources indicates up to ~ 30% carbon emission reduction and notable energy performance gains when nano-enhanced materials and smart city technologies are applied in tandem. Saudi case studies (e.g., residential compounds, campuses, smart city districts) report energy savings of up to ~ 30%, improved comfort, and positive life-cycle economics. 6 Discussion Mechanism of System-Level Value: Passive–Active Synergy: Findings align around a complementary logic: nanomaterials reduce baseline loads and prolong material lifetimes (passive resilience), while smart systems continually optimize operation based on weather and occupancy (active control). Their integration supports high-performance buildings and resilient urban systems. Saudi Implementation Landscape: National strategies emphasize green materials, energy and water efficiency, renewable energy (including BIPV), and waste reduction, thereby creating an enabling environment for integrated solutions. projects—KAFD, NEOM, and Mohammed Bin Salman Non-profit City—demonstrate feasibility through efficient façades, solar integration, smart HVAC/controls, and connected services. Nevertheless, mainstream adoption of smart buildings remains in its early stages, with many assets still built and operated conventionally. Overall, sustainable construction in Saudi Arabia is not simply a shift in material choices or digital practices. It represents a systemic transformation—integrating innovative materials, smart technologies, improved design methods, and stronger regulatory frameworks to create buildings and cities that meet present needs while safeguarding future generations. Adoption Barriers and Enablers: Persistent barriers mirror global gaps: economic feasibility and upfront capital, skills and training shortages, data standardization/interoperability, and fragmented integration frameworks. Targeted interventions open standards across BIM/IoT/digital twin ecosystems, focused workforce upskilling, and procurement/coding guidance that recognize lifecycle value—are pivotal to translating technical potential into routine practice. Policy and Practice Implications: Three priorities emerge: a) Codify integration of nano-enhanced materials and smart systems in codes/specifications with performance-based compliance paths; b) Mitigate first costs via incentives and lifecycle-costing frameworks recognizing durability and O&M savings; c) Invest in capacity across design, materials, analytics, and cyber-secure operations. Collectively, these steps align with the Kingdom’s sustainability strategy and accelerate measurable performance at building and district scales. Limitations: Generalizability is constrained by (i) limited long-term health and environmental data on certain nanomaterials under chronic exposure, and (ii) the context dependence of smart-technology outcomes (infrastructure readiness, user acceptance, governance). Gaps persist in standardized LCA and risk-evaluation protocols across both domains. Priority Directions for Future Research : Immediate opportunities include: Saudi-specific comparative studies (simulation + field monitoring) contrasting standard vs. integrated buildings to quantify energy, water, comfort, and economic outcomes; localized techno-economic and safety assessments for nano-enhanced materials (including end-of-life and exposure pathways); and integration trials that co-deploy PCMs/aerogels, switchable glazing, and anti-soiling BIPV with AI-enabled BMS/digital twins to identify optimal design–operation bundles and payback ranges. Concluding Perspective : A materials-plus-intelligence strategy—pairing nano-enhanced envelopes with data-driven operations—offers the clearest route to durable reductions in energy intensity, improved comfort, and lower lifecycle costs for Saudi buildings, provided that standards, skills, and governance advance in parallel. 7 Conclusion This review demonstrates that integrating nanomaterials with smart technologies provides a robust pathway for advancing high-performance and low-carbon construction in Saudi Arabia. Nano-enhanced materials—such as nano-modified concrete, nano-coatings, smart glazing, aerogels, PCMs, and BIPV—offer significant improvements in durability, thermal performance, and environmental efficiency, supporting long-term resilience in hot, arid climates. On the operational scale, smart systems, including IoT sensors, AI-driven analytics, BMS platforms, and digital twins, offer real-time monitoring, adaptive control, and predictive maintenance. Their combined application in Saudi building projects has already demonstrated energy savings of up to 30% and improved indoor comfort, underscoring the complementary value of integrating passive material innovations with active intelligent optimization. Despite these benefits, adoption remains limited due to high initial costs, scarce long-term health and environmental data on nanomaterials, interoperability issues, and shortages in digital and materials science expertise. Addressing these constraints requires a coordinated national framework that aligns with Saudi Vision 2030’s sustainability goals. Key priorities include embedding nano-enhanced materials and smart systems within building codes and performance-based standards, establishing lifecycle-costing and incentive mechanisms to overcome economic barriers, and expanding research and capacity-building programs focused on localized performance, risk assessment, and techno-economic evaluation. Overall, the findings confirm that a materials-plus-intelligence approach—pairing advanced nanomaterials with digitally enabled building operations—offers one of the most effective strategies for reducing energy intensity, enhancing climate resilience, and improving lifecycle economics across Saudi Arabia’s construction sector. As the Kingdom accelerates its transition toward smart, decarbonized urban development, integrating these technologies at scale will be essential to achieving durable, measurable sustainability outcomes. Declarations Acknowledgment The author extends his sincere appreciation to all individuals and institutions at Najran University who supported the preparation and publication of this work Competing interests The author declares that he has no relevant financial or non-financial interests to disclose. Funding The author declares that no funds, grants, or other support were received during the preparation of this manuscript. 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IoT and Big Data Analytics for Smart Buildings: A Survey. Procedia Comput Sci. 2019;170:161–8. https://doi.org/10.1016/j.procs.2020.03.021 . Taha OS, Alshibani A, AlTuraik AS, Mahmoud MA, Mohammed A, Hassanain MA. Digital technologies and sustainability barriers in heavy construction: A structural equation modeling study on triple-bottom-line outcomes. Results Eng. 2025;28:107808. https://doi.org/10.1016/j.rineng.2025.107808 . Waqar A, Shafiq N, Othman I, Alsulamy SH, Alshehri AM, Falqi II. Deterrents to the IoT for smart buildings and infrastructure development: A partial least square modeling approach. Heliyon. 2024;10(10):e31035. https://doi.org/10.1016/j.heliyon.2024.e31035 . Padmapriya R, Tripathy S, Gupta S, Swathi V, Manjunath HR. A comprehensive review of nanomaterials in sustainable construction: Advancing strength, durability, and cost efficiency. Multidisciplinary Reviews. 2025;8:2025ss0127. https://doi.org/10.31893/multirev.2025ss0127 . 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Advancements in green sustainable concrete technologies for sustainable development in Saudi Arabia: A review in light of vision 2030, Materials Research Proceedings, Vol. 48, pp 271–278, 2025. Amir M, Deshmukh RG, Khalid HM, Said Z, Raza A, Muyeen S, Nizami A, Elavarasan RM, Saidur R, Sopian K. Energy storage technologies: An integrated survey of developments, global economical/environmental effects, optimal scheduling model, and sustainable adaption policies. J Energy Storage. 2023;72:108694. https://doi.org/10.1016/j.est.2023.108694 . Morales-Inzunza S, González-Trevizo M, Martínez-Torres K, Luna-León A, Tamayo-Pérez U, Fernández-Melchor F, Santamouris M. On the potential of cool materials in the urban heat island context: Scalability challenges and technological setbacks towards building decarbonization. Energy Build. 2023;296:113330. https://doi.org/10.1016/j.enbuild.2023.113330 . Baskar I, Chellapandian M, Jeyasubramanian K. LA-PA eutectic/ nano- SiO2 composite phase change material for thermal energy storage application in buildings. Constr Build Mater. 2022;338:127663. https://doi.org/10.1016/j.conbuildmat.2022.127663 . Mohamed AS, Binabid J. Synergizing Nature-Inspired Adaptive Facades: Harnessing Plant Responses for Elevated Building Performance in Alignment with Saudi Green Initiatives. Buildings. 2024;15(21):3878. https://doi.org/10.3390/buildings15213878 . Guan J, Chen M. Nanoencapsulation of binary fatty acids for high-stability phase change materials: Synergistic synthesis and thermophysical characterization. Energy. 2025;335:138125. https://doi.org/10.1016/j.energy.2025.138125 . Qahtan AM, Al-Tamimi N, Baklouti I, Dodo YA, Elbellahy S. Building-integrated photovoltaics (BIPV) in Saudi Arabia for sustainable energy transition: A comprehensive review of status, challenges, and future prospects. Energy Build. 2025;347:116301. https://doi.org/10.1016/j.enbuild.2025.116301 . 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The building sector plays a central role in these challenges due to its substantial consumption of energy and materials throughout a building\u0026rsquo;s life cycle. In Saudi Arabia, the magnitude of this impact is particularly significant: the building sector accounts for 29% of total raw energy consumption and more than 75% of electricity use, with an annual growth rate of 7.2% [1]. Residential buildings alone represent approximately half of national electricity demand [2], largely driven by cooling requirements in hot summer months, where air conditioning loads can reach up to 65% of household energy use. At the global level, the urgency of intervention is underscored by the fact that the building sector accounted for 34% of total CO₂\u0026nbsp;emissions in 2023, making it the largest single source of energy-related emissions [3]. Additionally, embodied carbon associated with construction materials represents up to 39% of global energy-related carbon emissions [4]. Recognizing these pressures, Saudi Arabia has committed to achieving net-zero greenhouse gas emissions by 2060, supported by expanded deployment of renewable energy, carbon capture solutions, and systematic improvements in building-sector energy efficiency [2]. This transition is embedded within the Kingdom\u0026rsquo;s broader transformation under Saudi Vision 2030 [5], which seeks to modernize national infrastructure, promote digital technologies, and integrate sustainability into all economic sectors, including construction.\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eDespite these national commitments, many existing buildings in Saudi Arabia remain inadequately adapted to the region\u0026rsquo;s harsh climatic conditions. Common deficiencies include limited use of climate-responsive design strategies, inefficient building envelopes, and continued reliance on outdated or low-efficiency electrical systems and cooling technologies. To address these inefficiencies, the Saudi Energy Efficiency Center (SEEC) has launched extensive programs to establish performance standards, enhance public awareness, and promote the adoption of energy-efficient materials and appliances [6]. These initiatives target the building sector\u0026rsquo;s share of approximately 30% of total national energy consumption, highlighting the critical need for improved building performance at scale. Material selection represents another essential dimension of sustainable construction in the Kingdom. Green building materials\u0026mdash;characterized by durability, recyclability, and low environmental impact\u0026mdash;play a pivotal role in improving building performance, reducing lifecycle costs, and meeting certification requirements such as those of the Saudi Green Building Forum and LEED. Architects and engineers increasingly recognize that material choices influence not only structural integrity but also long-term environmental performance and user comfort [7]. In parallel, emerging advances in nanotechnology and smart technologies offer new pathways to significantly enhance building performance through improved thermal regulation, reduced energy consumption, and enhanced durability. These innovations are particularly relevant in hot arid regions, where extreme temperatures impose substantial energy demands and challenge conventional building systems.\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eAgainst this backdrop, Saudi Arabia is experiencing a transformative shift in its construction practices, driven by national sustainability goals, rapid digital transformation, and the region\u0026apos;s unique climatic challenges. Recent studies emphasize the potential of integrating nanomaterials and smart technologies to tackle key issues such as desertification, resource scarcity, and rising energy demands. The combination of material-level innovations (e.g., nano-enhanced concrete, coatings, glazing, and insulation) with building-scale intelligent systems (e.g., IoT platforms, AI-driven controls, and digital twins) offers a promising path toward high-performance, low-carbon buildings aligned with Vision 2030 objectives.\u003c/p\u003e\n\u003cp\u003eTherefore, this background provides the foundational context for this study: a rapidly evolving construction sector where environmental needs, climate conditions, and technological advancements intersect. It highlights the importance of thoroughly examining how nanomaterials and smart technologies can be strategically integrated to support sustainable, resilient, and future-ready buildings in Saudi Arabia.\u003c/p\u003e\n\u003cp\u003e1.2 Literature review\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eMany prior articles have explored nanomaterials and smart technologies in construction, focusing on their impacts, benefits, challenges, and opportunities in architecture, building performance, and infrastructure. Others proposed indicators for the use of nanomaterials, developed sustainability assessment methods, and created matrices to compare alternatives to traditional materials. Another study explored Smart Building Technology in Saudi Arabia and the Gulf, including terminology, expertise, and lifecycle challenges. Table 1 summarizes prior findings on nanomaterials and smart technologies in the building sector. \u0026nbsp;\u003c/p\u003e\n\u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"0\" class=\"fr-table-selection-hover\"\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd colspan=\"4\"\u003e\n \u003cp\u003eTable 1 summarizes previous research on nanomaterials and smart technologies in the building sector.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003eStudy No.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eObjectives\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eMethodology\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eResults\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e[8]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eReview of nanomaterials in construction and finishing materials, with an emphasis on their application within architecture, their impact on building performance, and their associated benefits.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eA review of academic publications related to Nanomaterials and their applications in the construction industry was conducted.\u0026nbsp;\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eIt helps create efficient, cost-effective buildings with unique designs and visual appeal by selecting suitable nanomaterials and application areas. Greater awareness of modern and nanotechnologies enhances building performance.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e[9]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eExplores the role of nanotechnology and nanostructures in reaching the UN Sustainable Development Goals (SDGs).\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eAn exhaustive review of research literature and data from various sources.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eHarnessing nanotechnology\u0026apos;s potential enables policymakers, researchers, and stakeholders to collaborate for a sustainable future and achieve the 17 UN Sustainable Development Goals.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e[10]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eExplores how nanomaterials in housing construction impact technical and structural aspects.\u0026nbsp;\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eReview of academic publications on Nanomaterials in construction.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eNanomaterials improve construction materials by boosting durability and strength by over 20%, reducing thermal conductivity, enabling self-cleaning, and enhancing various properties.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e[11]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003ePerforms a comprehensive review and recommends suitable indicators for the use of nanomaterials in construction.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eReviewing standards for traditional materials and bibliometric networks in nanomaterial research.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eA review of nanomaterials and European standards highlights the need for mandatory environmental, human health, and economic indicators for their use in construction.\u0026nbsp;\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e[12]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eDevelop a method to evaluate the sustainability of nanomaterials in construction, focusing on four key sustainability aspects.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eExplore the fundamentals of nanotechnology and its link to sustainable architecture, reviewing key nanomaterials, their effectiveness, and applications.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eIncorporating nanomaterials into construction enhances building materials, promotes sustainable architecture, and reduces carbon emissions.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e[13]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eDevelop an evaluation matrix for nanomaterials based on a \u0026quot;sustainable/economic\u0026quot; scale to compare and select alternatives within the same field, in contrast to traditional materials.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eAnalyses nanomaterials for sustainability, sets criteria, and creates a \u0026quot;sustainable/economic\u0026rdquo; tool to compare options.\u0026nbsp;\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eProvide an evaluation matrix for material sustainability and economics, divided into four zones, using nano-thermal protection materials as an example for sustainable building design.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e\u0026nbsp;\u0026nbsp;[14]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eAnalyze smart building technology, terminology, and expertise in Saudi Arabia and the Gulf. The study also examines lifecycle challenges.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eA literature review, a pilot test, and a survey of 90 architects, engineers, managers, and contractors.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eEnhance the understanding of building construction professionals by providing insights into the challenges associated with the adoption of Smart Building Technology.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n \u003c/table\u003e\n\u003c/div\u003e\n\u003cp\u003e1.3 Data gaps\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eRecent literature (2020\u0026ndash;2026) has identified data gaps in the application of nanomaterials and smart technologies in the building construction sector, both globally and in Saudi Arabia. Table 2 summarizes data gaps in the application of nanomaterials and smart technologies in the building construction sector.\u0026nbsp;\u003c/p\u003e\n\u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"0\"\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd colspan=\"4\"\u003e\n \u003cp\u003eTable 2 summarizes data gaps in the global application of nanomaterials and smart technologies, as well as in the Saudi building sector.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003eGap Area\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eGlobal Context\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eSaudi Context\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eImplications\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003eEconomic Feasibility\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eLack of direct cost-benefit data for nanomaterials [15]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eNo localized cost studies [15] (prices, supply chains, dust/soiling conditions, labor)\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eCapital budgeting under uncertainty,\u003c/p\u003e\n \u003cp\u003eLimits investment decisions\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003e\u0026nbsp;Health \u0026amp; Environmental Risk\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eInadequate nanoparticle risk data (chronic exposure, transport, end‑of‑life) [16]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eNo local risk assessment protocols (exposure assessment, monitoring, waste handling)\u0026nbsp;\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eRisks for worker safety and slow adoption rates.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003eData Standardization\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eLack of universal DT/BIM standards [17], no common schemas for exchanging envelopes, sensors, and lifecycle data across design, construction, and operations.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eUndefined BIM data exchange methods [18],\u0026nbsp;and limited interoperability across public and private platforms.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003ePoor interoperability, higher integration costs, and data silos.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003eIntegration Frameworks\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eFragmented tech adoption [19]; isolated pilots (BIM, blockchain, IoT, DT) rather than integrated delivery and operations frameworks.\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eIsolated BIM/Blockchain initiatives without codified materials‑plus‑intelligence frameworks in KSA guidance [18, 20].\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eReduced synergy and benefits.\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\n \u003cp\u003eSkills \u0026amp; Training\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eEducation gaps in emerging technologies [19]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eShortage of skilled personnel [18]\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd\u003e\n \u003cp\u003eSlower adoption, O\u0026amp;M performance drift\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n\u003c/table\u003e\n\u003cp\u003e1.4 Research objectives\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eThis study explores how nanomaterials and smart technologies can promote sustainable construction in Saudi Arabia by reviewing recent advancements in nano-enhanced materials and smart systems for hot, arid conditions. It identifies technical, economic, and regulatory gaps impacting their adoption domestically and globally. The study analyzes Saudi case studies to quantify energy, comfort, and lifecycle improvements, evaluates alignment with national strategies like Saudi Vision 2030, and develops an integration framework to standardize adoption, enhance skills, and inform lifecycle decisions. These objectives outline a focused approach to using materials and smart solutions for low-carbon, high-performance buildings in Saudi Arabia.\u003c/p\u003e\n\u003cp\u003e1.5 Importance of this research\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eThis article presents a novel, integrated approach to sustainable construction by combining nano-enhanced materials with smart, data-driven technologies. It introduces a \u0026apos;materials-plus-intelligence\u0026apos; framework that connects improvements in nanomaterials to operational optimization through IoT, AI, digital twins, and advanced building systems. The study highlights that these technologies can reduce energy use by up to 30% while enhancing durability, comfort, and lifecycle efficiency, using recent Saudi case studies. Key contributions include synthesizing nanomaterials and smart tech into a model, identifying data gaps and barriers, evaluating Saudi projects\u0026apos; outcomes, and offering strategic recommendations for policy, standardization, capacity building, and lifecycle design. These efforts support Saudi Vision 2030\u0026rsquo;s goal of high-performance and low-carbon buildings.\u003c/p\u003e"},{"header":"2 Methodology","content":"\u003cp\u003eThis study employs a systematic, structured literature review to analyze the integration of nanomaterials and smart technologies in sustainable construction, with particular focus on hot arid regions and the Saudi Arabian building sector. The review follows a multi-stage process that ensures rigor, transparency, and relevance, as shown in Fig.\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e. Google Scholar and ScienceDirect (including the ScienceDirect AI/ LeapSpace assistant for query refinement and article surfacing) were used to identify articles and pertinent data.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eFirst, a search strategy was developed to identify peer-reviewed studies, empirical research, and technical reports published over the past 12 years (2014\u0026ndash;2026), with emphasis on recent advancements in materials science, smart systems, and sustainable building technologies. Key primary sources comprised academic bibliographic databases and scholarly and scientific platforms, which were queried using targeted keywords related to nanomaterials, smart buildings, Saudi construction, PCM, insulation materials, and smart city applications.\u003c/p\u003e \u003cp\u003eInclusion criteria (Filters) prioritized: English‑language publications; primary studies, systematic reviews, meta‑analyses, and high‑quality modeling/empirical studies; peer‑reviewed journals prioritized. Grey literature (policy/technical reports) was considered only to contextualize Saudi‑specific implementation barriers/enablers and was not used for quantitative synthesis. Add to that, studies offer quantitative or qualitative insights into material performance, energy efficiency, environmental impact, or technological integration. Non-peer-reviewed sources, insufficiently detailed conference abstracts, non‑building contexts (e.g., unrelated nanomedicine, electronics) without clear transferability to buildings, opinion pieces, editorials, and non‑scholarly blog posts were excluded to maintain methodological rigor. Hundreds of studies in literature were reviewed for relevance, validity, data quality, and alignment with the study objectives. Ultimately, only 88 studies were included.\u003c/p\u003e \u003cp\u003eData extraction and synthesis were conducted through thematic analysis, which enabled the identification of key research trends, performance insights, data gaps, and adoption barriers. The process included organizing studies into material-level innovations, building-scale smart technologies, and urban-level infrastructure systems, followed by evaluating their collective implications for the Saudi context. The methodological workflow and the research structure are illustrated in the research process diagram in Fig.\u0026nbsp;\u003cspan refid=\"Fig2\" class=\"InternalRef\"\u003e2\u003c/span\u003e. This systematic approach ensures that the findings are evidence-based, comprehensive, and aligned with contemporary advancements in sustainable construction.\u003c/p\u003e \u003cp\u003e2.1 Assumptions \u0026amp; Limitations\u003c/p\u003e \u003cp\u003ea) Assumptions:\u003c/p\u003e \u003cp\u003eThe performance and sustainability benefits of nanomaterials and smart technologies are generalizable across diverse urban contexts.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eCost and risk data are based on current market and regulatory conditions, which may evolve.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eb) Limitations:\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eLong-term health and environmental impacts of nanomaterials remain underexplored due to limited chronic exposure studies.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eSmart technology adoption is context-dependent, with varying levels of digital infrastructure and public acceptance.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eData gaps exist in life cycle assessments and standardized risk evaluation protocols for both domains.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e"},{"header":"3 Sustainable construction","content":"\u003cp\u003eSustainable construction represents a comprehensive approach to planning, designing, constructing, and operating buildings that minimizes environmental impact, enhances social well‑being, and ensures long‑term economic efficiency. Given the growing environmental pressures\u0026mdash;particularly in hot, arid regions such as Saudi Arabia\u0026mdash;sustainable construction has become a central strategy for transforming the built environment. Within this frame, the sector\u0026rsquo;s multidimensional complexity\u0026mdash;spanning buildings, infrastructure, industrial facilities, renovation activities, and demolition\u0026mdash;requires coordinated engagement among diverse stakeholders, including architects, engineers, regulators, developers, suppliers, and financiers. This interdependence underscores the need for comprehensive frameworks that embed sustainability principles across all project phases rather than addressing environmental performance as an isolated design consideration. As global environmental challenges intensify, traditional construction practices have become insufficient for achieving the emissions reductions required to meet national and international sustainability targets.\u003c/p\u003e \u003cp\u003eIn response, contemporary sustainable construction strategies should increasingly encourage the integration of innovative materials, advanced digital technologies, and performance‑driven design practices. The following section presents a summary of opportunities and challenges for integrating nanomaterials and smart technologies at the levels of building materials and the urban context.\u003c/p\u003e \u003cdiv id=\"Sec8\" class=\"Section2\"\u003e \u003ch2\u003e3.1 Material-level innovations.\u003c/h2\u003e \u003cp\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eThe integration of nanomaterials and smart technologies at the level of building materials is a fundamental driver of modern sustainable construction. This approach enhances the physical, mechanical, thermal, and functional performance of building components while enabling responsive and resource‑efficient building operation. Together, these innovations support higher durability, improved energy efficiency, and better environmental performance. The subsequent section focuses on nanomaterial integration into base construction materials, such as concrete, coatings, glazing, and insulation.\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003cp\u003e \u003col\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eConcrete is vital for construction, but it causes environmental issues like CO\u003csub\u003e2\u003c/sub\u003e emissions and resource depletion. Sustainable concrete, using alternative materials and innovative methods, has emerged to improve performance and reduce impact [\u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e]. Recently, attention has focused on nanomaterials to enhance concrete [\u003cspan citationid=\"CR22\" class=\"CitationRef\"\u003e22\u003c/span\u003e], with nanoparticles listed in Table\u0026nbsp;3.\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003c/ol\u003e \u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"No\" id=\"Taba\" border=\"1\"\u003e \u003ccolgroup cols=\"3\"\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colspan=\"3\" nameend=\"c2\" namest=\"c1\"\u003e \u003cp\u003eTable\u0026nbsp;3 outlines the functions of nanoparticles used in concrete mixtures.\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eNanoparticles\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003ePurpose\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eNano-SiO\u003csub\u003e2\u003c/sub\u003e\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eRapid hydration, improved mechanical strength, and increased durability\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eNano-TiO\u003csub\u003e2\u003c/sub\u003e\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003ePhotocatalytic and photovoltaic properties; increased hydration level, enhanced mechanical strength, and improved durability.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eNano-Alumina\u003c/p\u003e \u003cp\u003e(Nano-Al\u003csub\u003e2\u003c/sub\u003eO\u003csub\u003e3\u003c/sub\u003e)\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eEnhancing mechanical properties and increasing the compactness of the interfacial transition zone (ITZ).\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eCarbon nanotube\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eMechanical, self-sensing \u0026amp; self-healing\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eNano-Fe\u003csub\u003e2\u003c/sub\u003eO\u003csub\u003e3\u003c/sub\u003e\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eAbrasion resistance enhances compressive strength.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eNano clays\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eEnhance surface roughness and improve compressive strength.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003cp\u003eRecent studies show that nanomaterials enhance cementitious systems [\u003cspan citationid=\"CR23\" class=\"CitationRef\"\u003e23\u003c/span\u003e], improving their properties, durability, and microstructure while accelerating hydration. Nano-modified concrete exhibits improved strength, reduced water absorption, and enhanced resistance to heat and radiation, making it suitable for self-healing and 3D printing. Addressing health and environmental challenges is essential. New methods can support resilient and sustainable construction [\u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e].\u003c/p\u003e \u003cp\u003e \u003cb\u003e2. Nano coatings\u003c/b\u003e are 1 to 100 nanometers thick [\u003cspan citationid=\"CR23\" class=\"CitationRef\"\u003e23\u003c/span\u003e], serve as ultra‑thin protective layers that enhance mechanical strength, corrosion resistance [\u003cspan citationid=\"CR22\" class=\"CitationRef\"\u003e22\u003c/span\u003e], surface hygiene, and UV durability. Their densely packed nanostructure prevents dirt and moisture penetration and provides self‑cleaning, antibacterial, and anti‑scratch functionalities. From a cost‑effectiveness perspective, nano‑coatings outperform traditional coatings by extending service life threefold and reducing repainting cycles by more than a decade [\u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e], making them one of the highest‑ROI envelope innovations [\u003cspan citationid=\"CR24\" class=\"CitationRef\"\u003e24\u003c/span\u003e]. Environmental risks associated with nanoparticle persistence remain a regulatory gap, yet compared with PCMs or aerogels, nano‑coatings exhibit lower integration complexity and broader applicability across fa\u0026ccedil;ades, interior surfaces, and PV modules.\u003c/p\u003e \u003cp\u003e \u003cb\u003e(3) Smart glass\u003c/b\u003e refers to advanced glazing technologies that can automatically or actively modify their tint, opacity, and transparency in response to external stimuli such as light, heat, or electricity. This capability allows buildings to control sunlight, glare, heat gain, and indoor brightness, improving both comfort and energy efficiency. There are three major categories of smart glass:\u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003ePhotochromic Glass\u003c/b\u003e (Passive Smart Glass) Adjusts tint automatically based on sunlight intensity.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eDarkens in bright light and becomes clear in low light. Ideal for large windows but lacks manual control.\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eThermochromic Glass\u003c/b\u003e (Passive Smart Glass) Reacts to temperature changes. Tints when exposed to high temperatures to reduce heat gain and glare. Becomes clearer in cooler conditions, maximizing natural daylight. Supports lower HVAC demands and better indoor comfort.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eElectrochromic Glass\u003c/b\u003e (Active Smart Glass) changes transparency through low‑voltage DC electricity. Helps regulate sunlight and heat, reducing electricity use by 75% and natural gas consumption by 60%. Improves safety, acoustics, and thermal stress resistance. Light transmittance shifts from 60% (clear) to 18% (tinted). Compared to passive photochromic and thermochromic systems, which are simpler and more cost‑effective, electrochromic glazing delivers superior adaptability, making it more suitable for high‑performance buildings and regions with extreme solar gain. However, integration costs and durability remain adoption barriers, especially compared with simpler envelope upgrades.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003cp\u003e \u003cb\u003e3. Insulation materials\u003c/b\u003e improve thermal regulation, cut energy use, and reduce CO\u003csub\u003e2\u003c/sub\u003e emissions, with advantages that vary according to climate and strategy [\u003cspan citationid=\"CR25\" class=\"CitationRef\"\u003e25\u003c/span\u003e]. Challenges include high costs, unpredictable performance, implementation issues, and limited applications. The paragraph below describes two types of smart insulation materials:\u003c/p\u003e\u003cp\u003e \u003cb\u003ea. Aerogel\u003c/b\u003e provides one of the highest insulation efficiencies among building materials due to its extremely low density and high porosity (95% air). In hot‑arid climates, aerogels deliver exceptional thermal resistance, acoustic dampening, and moisture stability while maintaining minimal thickness requirements. Compared to PCMs, aerogels provide more consistent passive insulation without performance degradation over time. However, their high manufacturing costs limit large‑scale deployment. While nano‑coatings enhance durability and smart glass controls solar gain, aerogels represent the most effective single material for reducing conductive heat transfer, especially in retrofits where wall thickness is constrained.\u003c/p\u003e \u003cp\u003e \u003cb\u003eb) Phase Change Material\u003c/b\u003e (PCMs) effectiveness relies on their thermophysical, chemical, and economic attributes, as illustrated in Fig.\u0026nbsp;\u003cspan refid=\"Fig3\" class=\"InternalRef\"\u003e3\u003c/span\u003e. PCMs enhance building thermal storage by absorbing and releasing heat during phase transitions, effectively smoothing indoor temperature fluctuations, reducing peak cooling loads by 1\u0026ndash;10\u0026deg;C, and offering up to six‑fold increases in thermal storage capacity [\u003cspan citationid=\"CR26\" class=\"CitationRef\"\u003e26\u003c/span\u003e].\u003c/p\u003e \u003cp\u003eTheir payback period (4\u0026ndash;10 years) is competitive with smart glass and often more favorable than aerogels[\u003cspan citationid=\"CR26\" class=\"CitationRef\"\u003e26\u003c/span\u003e]. However, PCMs face challenges such as low thermal conductivity, flammability, and material incompatibility [\u003cspan citationid=\"CR26\" class=\"CitationRef\"\u003e26\u003c/span\u003e]. Compared with aerogels, which offer steady-state insulation, PCMs excel at dynamic thermal regulation, making them ideal for climates with large diurnal temperature swings\u0026mdash;but require careful integration to avoid performance degradation.\u003c/p\u003e \u003cp\u003e \u003cb\u003e4. Building Integrated Photovoltaics\u003c/b\u003e (BIPV) embeds solar panels into buildings, turning surfaces into energy sources while maintaining aesthetics [\u003cspan citationid=\"CR27\" class=\"CitationRef\"\u003e27\u003c/span\u003e]. It replaces traditional materials on roofs, skylights, or facades, serving as both a building element and a power generator [\u003cspan citationid=\"CR28\" class=\"CitationRef\"\u003e28\u003c/span\u003e]. Nanoscale BIPV employs nanotechnology to enhance performance and aesthetics, offering more efficient and attractive solar options. Figure\u0026nbsp;\u003cspan refid=\"Fig4\" class=\"InternalRef\"\u003e4\u003c/span\u003e illustrates the benefits of BIPV [\u003cspan citationid=\"CR30\" class=\"CitationRef\"\u003e30\u003c/span\u003e]. BIPV solutions consist of PV skylights, PV curtain walls, PV claddings, PV canopies, PV pavements, louvers, and balustrades [\u003cspan citationid=\"CR27\" class=\"CitationRef\"\u003e27\u003c/span\u003e]. Photovoltaic (PV) system efficiency is hindered by soiling, particularly in desert environments, where dust reduces light and increases maintenance costs [\u003cspan citationid=\"CR29\" class=\"CitationRef\"\u003e29\u003c/span\u003e]. Nano-coatings can cut soiling, boost light absorption, and increase energy yield [\u003cspan citationid=\"CR29\" class=\"CitationRef\"\u003e29\u003c/span\u003e]. An experiment showed that dust reduces BIPV power, whereas hydrophilic Nano coatings increase power by 18% relative to wiping and reduce the payback period to 3.9 years [\u003cspan citationid=\"CR31\" class=\"CitationRef\"\u003e31\u003c/span\u003e].\u003c/p\u003e \u003cp\u003eOverall, nano‑coatings and smart glass offer the most immediate and scalable energy savings, whereas aerogels and PCMs provide high-performance solutions better suited to specialized applications or advanced building envelopes. The strategic combination of these materials\u0026mdash;linking passive insulation (aerogels, PCMs) with active envelope control (smart glass) and durability enhancements (nano‑coatings)\u0026mdash;forms a synergistic pathway toward achieving high‑performance and low‑carbon buildings. Although the above innovations are reshaping the sustainability landscape by enabling reductions in energy use, lowering lifecycle costs, and improving resilience to extreme climatic conditions, many challenges remain in their application. Table\u0026nbsp;\u003cspan refid=\"Tab3\" class=\"InternalRef\"\u003e5\u003c/span\u003e provides a summarized, evidence-based comparative overview of the pros and cons of nanomaterials and smart technologies, equipping decision-makers with the insights needed for informed adoption in building and urban contexts [\u003cspan citationid=\"CR32\" class=\"CitationRef\"\u003e32\u003c/span\u003e].\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab3\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 5\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003eprovides an overview of the pros and cons of nanomaterials and smart technologies.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"5\"\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c5\" colnum=\"5\"\u003e\u003c/div\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eDimension\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eNanomaterials: Pros\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003eNanomaterials: Cons\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c4\"\u003e \u003cp\u003eSmart Technologies: Pros\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c5\"\u003e \u003cp\u003eSmart Technologies: Cons\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003ePerformance\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eEnhanced strength, durability, and functionality. Self-cleaning, antibacterial, UV protection [\u003cspan citationid=\"CR33\" class=\"CitationRef\"\u003e33\u003c/span\u003e]. Improved energy efficiency and resilience.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eLong-term aging and degradation, agglomeration and dispersion problems\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003e- Real-time monitoring and adaptive control, Improved operational efficiency and comfort, Enhanced safety and security\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003e- System compatibility and interoperability issues - Potential for system failures and technical complexity\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eSustainability\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eReduced energy use and carbon emissions [\u003cspan citationid=\"CR34\" class=\"CitationRef\"\u003e34\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR35\" class=\"CitationRef\"\u003e35\u003c/span\u003e] - Extended lifespan of materials - Potential for green/recycled nanomaterials\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eEnergy-intensive production - Environmental persistence and toxicity - Disposal and recycling challenges\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eEnergy and resource savings (up to 30% reduction) [\u003cspan citationid=\"CR32\" class=\"CitationRef\"\u003e32\u003c/span\u003e, \u003cspan additionalcitationids=\"CR37\" citationid=\"CR36\" class=\"CitationRef\"\u003e36\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR38\" class=\"CitationRef\"\u003e38\u003c/span\u003e] - Waste reduction and environmental management - Supports net-zero and green goals\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003e- Electronic waste generation - Digital divide and access inequities - Data center energy use\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eCost\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003e- Long-term savings via durability and reduced maintenance [\u003cspan citationid=\"CR39\" class=\"CitationRef\"\u003e39\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR40\" class=\"CitationRef\"\u003e40\u003c/span\u003e] - Material savings\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003e- High initial production and integration costs - Limited industrial experience\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eReduce operational costs (up to 20%) [\u003cspan citationid=\"CR32\" class=\"CitationRef\"\u003e32\u003c/span\u003e, \u003cspan citationid=\"CR36\" class=\"CitationRef\"\u003e36\u003c/span\u003e, \u003cspan citationid=\"CR37\" class=\"CitationRef\"\u003e37\u003c/span\u003e, \u003cspan citationid=\"CR38\" class=\"CitationRef\"\u003e38\u003c/span\u003e]- Increased property values\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003e- High upfront investment - Ongoing maintenance and upgrade costs [\u003cspan citationid=\"CR41\" class=\"CitationRef\"\u003e41\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR42\" class=\"CitationRef\"\u003e42\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eSafety\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003ePotential for safer, more resilient structures\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003e- Health risks (toxicity, chronic exposure) - Regulatory gaps - Occupational hazards\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003e- Improved physical safety (e.g., surveillance, alarms) - AI-driven threat detection\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003e- Cybersecurity threats - Privacy risks - Data breaches and misuse [\u003cspan citationid=\"CR43\" class=\"CitationRef\"\u003e43\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR44\" class=\"CitationRef\"\u003e44\u003c/span\u003e]\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eImplementation\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003e- Enables smart, adaptive infrastructure - Supports circular economy with recycled nanomaterials\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003e- Regulatory and standardization challenges - Need for comprehensive risk management - Limited long-term data\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003e- Scalable with open standards - Enables citizen engagement and participatory governance\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003e- Stakeholder engagement and public acceptance hurdles - Data governance and trust issues.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003cp\u003eGenerally, nanomaterials provide notable performance improvements, such as greater strength and durability, and additional functions, including self-cleaning and antibacterial properties, which result in longer lifespans and energy savings in building components, but they also entail higher production costs and potential health and environmental risks. Also, smart technologies offer efficiency gains through real-time monitoring, lower costs via energy optimization, and better security systems; however, they also introduce challenges related to cybersecurity, data privacy, interoperability, and high initial capital costs.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec9\" class=\"Section2\"\u003e \u003ch2\u003e3.2 Building‑/district‑scale Smart systems\u003c/h2\u003e \u003cp\u003eThe integration of nanotechnology and smart technologies into urban infrastructure is transforming city systems by embedding advanced materials and sensors, which enhance the management and operation of transportation networks, energy grids, and building systems. This integration leads to improved efficiency, real-time monitoring, predictive maintenance, and intelligent decision-making, all of which contribute to more sustainable, resilient, and livable cities. Nevertheless, the incorporation of nanomaterials and intelligent technologies into urban infrastructure bears technological, environmental, economic, and social implications as delineated below.\u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eTechnological impacts\u003c/b\u003e: The integration of nanomaterials and smart technologies into urban infrastructure has led to significant advancements in material performance, real-time monitoring, and intelligent decision-making [\u003cspan additionalcitationids=\"CR46\" citationid=\"CR45\" class=\"CitationRef\"\u003e45\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR47\" class=\"CitationRef\"\u003e47\u003c/span\u003e]. Smart technologies, including the Internet of Things (IoT), artificial intelligence (AI), big data analytics, and digital twins, enable real-time monitoring, predictive maintenance, and intelligent management of infrastructure systems [\u003cspan citationid=\"CR46\" class=\"CitationRef\"\u003e46\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR47\" class=\"CitationRef\"\u003e47\u003c/span\u003e]. These technologies optimize resource use, enhance public safety, and support efficient decision-making before, during, and after hazards such as floods. The integration of nanotechnology with AI and IoT further enhances infrastructure resilience and functionality.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eEnvironmental impacts\u003c/b\u003e: Nanomaterials and smart technologies support environmental sustainability by lowering carbon emissions, boosting energy efficiency, and improving pollution control. Quantitative results show up to a 30% reduction in carbon emissions and a 25% increase in energy performance through nano-enhanced materials [\u003cspan citationid=\"CR45\" class=\"CitationRef\"\u003e45\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR46\" class=\"CitationRef\"\u003e46\u003c/span\u003e]. Smart city technologies, including ICT, IoT, and smart mobility systems, enhance energy efficiency in buildings and transportation, reducing greenhouse gas emissions and improving air quality [\u003cspan citationid=\"CR45\" class=\"CitationRef\"\u003e45\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR46\" class=\"CitationRef\"\u003e46\u003c/span\u003e]. They also promote water conservation through leak detection and optimized distribution and enhance waste management by increasing recycling rates and reducing waste produced. Nevertheless, the production of electronic devices for smart technologies can produce electronic waste and environmental damage if not managed responsibly, underscoring the necessity for sustainable solutions and appropriate management.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eEconomics impacts\u003c/b\u003e: The adoption of nanomaterials and smart technologies in urban infrastructure can lead to economic benefits such as reduced operational costs, improved efficiency, and increased asset longevity [\u003cspan citationid=\"CR45\" class=\"CitationRef\"\u003e45\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR46\" class=\"CitationRef\"\u003e46\u003c/span\u003e]. Smart mobility and intelligent transport systems support economic competitiveness by minimizing disruptions to economic activity and improving access to essential goods and services [\u003cspan citationid=\"CR46\" class=\"CitationRef\"\u003e46\u003c/span\u003e, \u003cspan citationid=\"CR48\" class=\"CitationRef\"\u003e48\u003c/span\u003e]. Despite these benefits, challenges such as high implementation costs, production scalability, and integration with existing infrastructure remain significant barriers to widespread adoption [\u003cspan citationid=\"CR45\" class=\"CitationRef\"\u003e45\u003c/span\u003e, \u003cspan citationid=\"CR47\" class=\"CitationRef\"\u003e47\u003c/span\u003e].\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eSocial impacts\u003c/b\u003e: The integration of nanomaterials and smart technologies into urban infrastructure can enhance quality of life, promote social equity, and encourage community engagement [\u003cspan additionalcitationids=\"CR46\" citationid=\"CR45\" class=\"CitationRef\"\u003e45\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR47\" class=\"CitationRef\"\u003e47\u003c/span\u003e, \u003cspan citationid=\"CR49\" class=\"CitationRef\"\u003e49\u003c/span\u003e]. Smart city initiatives aim to enhance public services, mobility, and resource efficiency, benefiting the entire community and reducing digital divides. Open big data analysis and transparent governance can increase public trust in government and support inclusive urban innovation. However, there are concerns about privacy and data security, as well as the potential for reduced human engagement with nature due to increased reliance on technological solutions [\u003cspan citationid=\"CR47\" class=\"CitationRef\"\u003e47\u003c/span\u003e]. Robust data governance frameworks and stakeholder collaboration are necessary to balance technological innovation with ethical and social considerations. Additionally, the deployment of clean technologies and improved living conditions can increase the welfare of marginalized urban populations, promoting comprehensive economic and social development.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003cp\u003eHowever, integrating nanomaterials with smart technologies in urban infrastructure is multifaceted. Table\u0026nbsp;\u003cspan refid=\"Tab4\" class=\"InternalRef\"\u003e6\u003c/span\u003e summarizes the key insights, challenges/risks, and opportunities/recommendations concerning the impact dimension of integrating nanomaterials with smart technologies in urban infrastructure.\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab4\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 6\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003esummarizes key insights, challenges/risks, and opportunities/recommendations on integrating nanomaterials with smart tech. in urban infrastructure.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"4\"\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eDimension\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eKey Insights\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003eChallenges / Risks\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c4\"\u003e \u003cp\u003eOpportunities / Recommendations\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eTechnological\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eNanomaterials (e.g., nano‑silica, nano‑TiO₂) and smart systems (IoT, AI, blockchain) enhance infrastructure adaptability, durability, and automation.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eScalability limitations, interoperability issues with legacy systems, cybersecurity risks, and regulatory gaps.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eAdvance green synthesis methods; adopt modular/open digital architectures; develop unified standards to enable scalable integration.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eEnvironmental\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eNanomaterials enhance durability, reduce pollution, and increase resilience; smart green infrastructure promotes climate-adaptive operations.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eLong-term ecological risks: including nanoparticle accumulation, soil/water toxicity, and uncertain end‑of‑life behavior.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eEstablish comprehensive risk‑assessment protocols; pair engineered systems with nature‑based solutions to mitigate ecological impacts.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eEconomic\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eLong-term savings via durability, reduced maintenance, and operational efficiency. Blockchain improves transparency.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eHigh initial costs, regulatory uncertainty, and limited field-scale cost-benefit analyses.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eUse public\u0026ndash;private partnerships; create standardized evaluation frameworks; employ digital twins to optimize the economy.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eSocial\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eSupport citizen-centric innovation, ethical governance, and participatory models that foster trust and inclusivity.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eDigital gaps, privacy concerns, algorithmic bias, and inconsistent public acceptance.\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eImplement inclusive design guidelines; strengthen data governance; establish urban living labs to build trust and accelerate adoption.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003c/div\u003e"},{"header":"4 Saudi Arabia's construction sector","content":"\u003cdiv id=\"Sec11\" class=\"Section2\"\u003e \u003ch2\u003e4.1 Sustainability strategies\u003c/h2\u003e \u003cp\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eThe building sector in Saudi Arabia is experiencing significant changes aligned with the Kingdom\u0026rsquo;s Vision 2030, guided by the following key strategies, as illustrated in Fig.\u0026nbsp;\u003cspan refid=\"Fig5\" class=\"InternalRef\"\u003e5\u003c/span\u003e.\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eAdopting green building materials enhances energy efficiency, reduces maintenance costs, and complies with the Leadership in Energy and Environmental Design (LEED) system and Saudi Green Building Forum standards by using eco-friendly, recyclable, and durable materials with minimal environmental impact.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eAchieving energy efficiency through reducing consumption and emissions to meet environmental goals. Key measures include solar panels, efficient lighting, and smart systems.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eAchieving water efficiency involves minimizing water use, reusing wastewater, conserving energy, and reducing costs. Water conservation is vital for Saudi Arabia\u0026rsquo;s sustainability in its arid climate. New technologies such as rainwater harvesting, greywater recycling, smart appliances, water-efficient fixtures, and irrigation systems significantly reduce water consumption.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eRenewable energy sources integration: Saudi Arabia, guided by Vision 2030, seeks to diversify its energy mix and boost renewables like solar, wind, and hydrogen to 50% through on-site and off-site sources by 2030. Building-Integrated Photovoltaics (BIPV) substitutes conventional building elements with photovoltaic (PV) modules, thereby enhancing both energy generation and aesthetic appeal. BIPV facilitates the production of renewable energy, serves as a protective barrier, reduces overall costs, and minimizes installation expenses compared to traditional panels. Consequently, these benefits render BIPV advantageous for applications such as skylights, railings, and other areas. While BAPV modules are integrated into building elements, they expand space and convert solar energy for residential use [\u003cspan citationid=\"CR50\" class=\"CitationRef\"\u003e50\u003c/span\u003e].\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eWaste reduction: Emphasizing the importance of reducing construction waste through the promotion of modular and prefabricated buildings, as well as recycling and reusing materials, to lessen environmental impact, decrease waste, and accelerate project timelines.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec12\" class=\"Section2\"\u003e \u003ch2\u003e4.2 Sustainable construction: Key drivers\u003c/h2\u003e \u003cp\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eGreen building (GB) practices aim to mitigate CO\u003csub\u003e2\u003c/sub\u003e emissions and reduce energy consumption [\u003cspan citationid=\"CR51\" class=\"CitationRef\"\u003e51\u003c/span\u003e] while complying with sustainability principles, namely economic, social, and environmental considerations. The main drivers leading green construction encompass economic, environmental, social, regulatory, and technological factors that motivate stakeholders to adopt sustainable methods. For example, Saudi Arabia\u0026rsquo;s Vision 2030 and government initiatives focus on promoting sustainable construction. Moreover, growing environmental awareness among decision-makers, construction industry leaders, and building practices provides long-term savings through energy and water conservation, while waste management emphasizes reducing, reusing, and recycling construction and demolition waste to lower environmental impact.\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec13\" class=\"Section2\"\u003e \u003ch2\u003e4.3 Efforts for Sustainable Construction in KSA\u003c/h2\u003e \u003cp\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eSaudi Arabia's Vision 2030 promotes sustainable construction to diversify the economy and improve living standards. It promotes the integration of nanomaterials and intelligent technologies to tackle challenges related to the hot arid climate, energy, and economic development.\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003cp\u003eSaudi Arabia\u0026rsquo;s construction sector is at the forefront of integrating nanomaterials and intelligent technologies to address the intertwined challenges of hot arid climates, energy efficiency, and economic development. Case studies and simulation analyses consistently demonstrate substantial energy savings, improved indoor comfort, and positive economic impacts. The Schematic Table\u0026nbsp;\u003cspan refid=\"Tab5\" class=\"InternalRef\"\u003e7\u003c/span\u003e summarizes Saudi building projects that integrate nanomaterials and intelligent technologies to address the challenges of the hot arid climate, energy, and economic development. These projects demonstrate energy savings (up to 30%), improved indoor comfort, and economic benefits such as reduced lifecycle costs and support for national sustainability initiatives [\u003cspan additionalcitationids=\"CR53 CR54 CR55 CR56 CR57\" citationid=\"CR52\" class=\"CitationRef\"\u003e52\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR58\" class=\"CitationRef\"\u003e58\u003c/span\u003e].\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab5\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 7\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003esummarizes Saudi building projects that integrate nanomaterials and intelligent technologies.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"8\"\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c5\" colnum=\"5\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c6\" colnum=\"6\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c7\" colnum=\"7\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c8\" colnum=\"8\"\u003e\u003c/div\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colspan=\"2\" nameend=\"c2\" namest=\"c1\"\u003e \u003cp\u003eProject/Location\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003eClimate Adaptation Strategies\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colspan=\"2\" nameend=\"c5\" namest=\"c4\"\u003e \u003cp\u003eNanomaterials Used\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colspan=\"2\" nameend=\"c7\" namest=\"c6\"\u003e \u003cp\u003eIntelligent Technologies\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c8\"\u003e \u003cp\u003eMeasured Outcomes (Energy/Economic)\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eRiyadh Residential Compound\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eAdaptive facades, optimized envelope\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eelectrochromic glass\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c6\" namest=\"c5\"\u003e \u003cp\u003eSmart facade controls\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c8\" namest=\"c7\"\u003e \u003cp\u003e30% HVAC energy reduction; improved comfort [\u003cspan citationid=\"CR53\" class=\"CitationRef\"\u003e53\u003c/span\u003e]\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eCase studies in Riyadh Commercial/Residential\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eHVAC optimization, building orientation, window placement, and insulation materials\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eHVAC improvements, Nano-insulation,\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c6\" namest=\"c5\"\u003e \u003cp\u003eDigital tools (BIM-PMBOK\u0026ndash;ML) framework\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c8\" namest=\"c7\"\u003e \u003cp\u003e13\u0026ndash;15% energy savings; 20\u0026ndash;25% GHG emission reduction [\u003cspan citationid=\"CR54\" class=\"CitationRef\"\u003e54\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eNEOM Smart City\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003epassive-based techniques (Dynamic shading, PCM, PV integration)\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003e5\u0026ndash;20 cm insulation (PCM)\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c6\" namest=\"c5\"\u003e \u003cp\u003eDigital tools\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c8\" namest=\"c7\"\u003e \u003cp\u003eReduced heat exchange by 63.5% in PCM-filled building envelopes [\u003cspan citationid=\"CR56\" class=\"CitationRef\"\u003e56\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eSaudi Commercial Buildings\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c3\" namest=\"c2\"\u003e \u003cp\u003eBuilding envelope optimization\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003e- Nanogel glazing\u003c/p\u003e \u003cp\u003e- Nano\u0026nbsp;vacuum insulation panel\u0026nbsp;(VIP)-\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c6\" namest=\"c5\"\u003e \u003cp\u003eDigital tools (Autodesk Revit, Ecotect software)\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c8\" namest=\"c7\"\u003e \u003cp\u003e14.5\u0026ndash;14.8% energy savings; short payback [\u003cspan citationid=\"CR58\" class=\"CitationRef\"\u003e58\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003cp\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eMoreover, Saudi Arabia's Vision 2030 and National Transformation Program (NTP) prioritize smart cities and infrastructure, making smart buildings a key focus for the industry. Government support for sustainability and technology fosters the growth of smart buildings. The focus aligns with Vision 2030 by incorporating IoT, AI, and big data into urban planning to improve city flow, boost energy efficiency, and promote economic diversity, livability, and sustainability. Several important factors underscore the significance of smart cities in Saudi Arabia, such as:\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eSmart cities enhance economic diversity through the attraction of technology companies, startups, and innovation sectors, thereby fostering research and development, entrepreneurship, and knowledge-based industries.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eSaudi Arabia\u0026rsquo;s smart cities prioritize environmental sustainability, featuring eco-friendly infrastructure, waste management systems, renewable energy sources, and lowered emissions.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eThey also improve residents\u0026rsquo; quality of life through advanced transportation, smart healthcare, and digital education. Additionally, the influence of cities on urban life is profound, transformative, and multifaceted as follows:\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eConnectivity: High-speed internet facilitates remote access.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eSafety: Security systems improve public safety.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eMobility: Smart cities offer efficient transport, decreasing pollution and congestion.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eEconomic Growth: Tech companies and startups drive growth and jobs.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003cp\u003eThe subsequent paragraph presents examples of intelligent cities and districts in the Kingdom of Saudi Arabia, highlighting major projects featuring buildings that integrate smart technologies.\u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eKing Abdullah\u003c/b\u003e Financial District (KAFD) \u0026ndash; Riyadh: KAFD exemplifies a smart district with buildings and infrastructure using smart tech. Features include LEED Platinum sustainable design, energy-efficient facades, solar panels, and smart HVAC. An underground waste system reduces energy consumption by 50% and emissions by 90% [\u003cspan citationid=\"CR59\" class=\"CitationRef\"\u003e59\u003c/span\u003e]. Climate-controlled skywalks and monorails support pedestrian access [\u003cspan citationid=\"CR59\" class=\"CitationRef\"\u003e59\u003c/span\u003e].\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eNEOM Megaprojects\u003c/b\u003e: NEOM is building smart cities like The Line, Oxagon, and Trojena with AI, IoT, high-efficiency materials, and digital twins for real-time monitoring. They aim to boost energy efficiency, automate services, and achieve zero-carbon targets, demonstrating Saudi Arabia\u0026rsquo;s smart-city and environmental goals. Key highlights include Innovation and Sustainability: NEOM is an eco-friendly city powered by renewable energy. It highlights impressive green infrastructure and an advanced water technology system, all working together to create a sustainable, innovative community. Robots will enhance residents\u0026rsquo; lives [\u003cspan citationid=\"CR60\" class=\"CitationRef\"\u003e60\u003c/span\u003e]. It's a flexible regulatory framework that supports autonomous transportation and AI. The Line City exemplifies future urban development, balancing innovation with climate resilience. Success hinges on managing construction impacts, environmental risks, and scalability [\u003cspan citationid=\"CR61\" class=\"CitationRef\"\u003e61\u003c/span\u003e].\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eMohammed Bin Salman\u003c/b\u003e Nonprofit City \u0026ndash; Riyadh: This development is a smart nonprofit city for education and innovation, featuring Smart Concrete with sensors, Technology-Ready Infrastructure, and AI-powered Smart Classrooms for campus management and learning.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec14\" class=\"Section2\"\u003e \u003ch2\u003e4.4 Nanomaterials and Smart Technologies Adoption: Opportunities and Challenges\u003c/h2\u003e \u003cp\u003e \u003cdiv class=\"BlockQuote\"\u003e \u003cp\u003eThe Saudi construction industry can adopt adaptive nanomaterials and smart technologies, guided by Saudi Vision 2030 and giga projects such as NEOM. Opportunities to leverage adaptive nanomaterials and smart technologies in Saudi Arabia's building sector are robust, with recent global advances demonstrating significant potential for energy efficiency, dynamic environmental response, and durability enhancement. However, to fully capitalize on these innovations, Saudi Arabia must overcome technical and organizational barriers by developing updated policy frameworks aligned with Vision 2030 and by conducting interdisciplinary research that integrates digital transformation with materials science [\u003cspan citationid=\"CR62\" class=\"CitationRef\"\u003e62\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR63\" class=\"CitationRef\"\u003e63\u003c/span\u003e]. Table\u0026nbsp;\u003cspan refid=\"Tab6\" class=\"InternalRef\"\u003e8\u003c/span\u003e summarizes the current status, opportunities, challenges, gaps, future directions, and recommendations for integrating nanomaterials and smart technologies in the Saudi construction sector.\u003c/p\u003e \u003c/div\u003e \u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab6\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 8\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003esummarizes the current status, opportunities, challenges, gaps, future directions, and recommendations for integrating nanomaterials and smart technologies in the Saudi construction sector.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"5\"\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c5\" colnum=\"5\"\u003e\u003c/div\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eTheme/Area\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eCurrent Status \u0026amp; Opportunities\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colspan=\"2\" nameend=\"c4\" namest=\"c3\"\u003e \u003cp\u003eChallenges \u0026amp; Gaps\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c5\"\u003e \u003cp\u003eFuture Directions \u0026amp; Recommendations\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eAdaptive Nanomaterials\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eImprove durability, self-healing, and energy efficiency in building materials\u0026nbsp;[\u003cspan citationid=\"CR64\" class=\"CitationRef\"\u003e64\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eHigh cost, fire/toxicity risks, limited long-term data, scalability\u0026nbsp;constraints [\u003cspan additionalcitationids=\"CR66\" citationid=\"CR65\" class=\"CitationRef\"\u003e65\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR67\" class=\"CitationRef\"\u003e67\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c5\" namest=\"c4\"\u003e \u003cp\u003eConduct localized performance evaluations; support regulatory frameworks; enhance interdisciplinary R\u0026amp;D. [\u003cspan citationid=\"CR68\" class=\"CitationRef\"\u003e68\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR69\" class=\"CitationRef\"\u003e69\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eSmart Technologies (IoT, BIM, Digital Twins)\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eEnable real-time monitoring, predictive maintenance, and improve operational efficiency [\u003cspan additionalcitationids=\"CR71\" citationid=\"CR70\" class=\"CitationRef\"\u003e70\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR72\" class=\"CitationRef\"\u003e72\u003c/span\u003e, \u003cspan citationid=\"CR62\" class=\"CitationRef\"\u003e62\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eInteroperability issues; infrastructure readiness, skills gaps, cybersecurity vulnerabilities [\u003cspan citationid=\"CR74\" class=\"CitationRef\"\u003e74\u003c/span\u003e], [\u003cspan citationid=\"CR74\" class=\"CitationRef\"\u003e74\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c5\" namest=\"c4\"\u003e \u003cp\u003eUpskill Workforce, strengthen leadership and governance models, and adopt open digital standards [\u003cspan citationid=\"CR76\" class=\"CitationRef\"\u003e76\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003ePolicy \u0026amp; Vision 2030 Alignment\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eStrong national push toward digitalization and sustainability; incentives for smart technologies [\u003cspan citationid=\"CR76\" class=\"CitationRef\"\u003e76\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR77\" class=\"CitationRef\"\u003e77\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eAbsence of clear guidelines for nanomaterial adoption; inconsistent regulatory frameworks. [\u003cspan citationid=\"CR78\" class=\"CitationRef\"\u003e78\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR79\" class=\"CitationRef\"\u003e79\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c5\" namest=\"c4\"\u003e \u003cp\u003eEmbed material‑tech integration in building codes; support green‑transition incentives [\u003cspan citationid=\"CR79\" class=\"CitationRef\"\u003e79\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR80\" class=\"CitationRef\"\u003e80\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eHot Arid Climate Adaptation\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003ePCMs, aerogels, and biomimetic facades reduce cooling loads and improve comfort [\u003cspan citationid=\"CR65\" class=\"CitationRef\"\u003e65\u003c/span\u003e, \u003cspan citationid=\"CR81\" class=\"CitationRef\"\u003e81\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eEconomic feasibility concerns and limited market readiness [\u003cspan citationid=\"CR82\" class=\"CitationRef\"\u003e82\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c5\" namest=\"c4\"\u003e \u003cp\u003ePilot projects, simulation-based research, and local material optimization [\u003cspan citationid=\"CR83\" class=\"CitationRef\"\u003e83\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR84\" class=\"CitationRef\"\u003e84\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOrganizational \u0026amp; Social Factors\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eLeadership engagement and management support critical for adoption [\u003cspan citationid=\"CR73\" class=\"CitationRef\"\u003e73\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCultural resistance, high upfront costs, and lack of public awareness [\u003cspan citationid=\"CR85\" class=\"CitationRef\"\u003e85\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR86\" class=\"CitationRef\"\u003e86\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c5\" namest=\"c4\"\u003e \u003cp\u003eAwareness campaigns, stakeholder engagement, and financial incentives for sustainable technologies [\u003cspan citationid=\"CR87\" class=\"CitationRef\"\u003e87\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eInterdisciplinary Approaches\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eRecognized as essential for delivering integrated\u003c/p\u003e \u003cp\u003esustainable solutions [\u003cspan citationid=\"CR68\" class=\"CitationRef\"\u003e68\u003c/span\u003e, \u003cspan citationid=\"CR69\" class=\"CitationRef\"\u003e69\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eLimited multi-sector collaboration and insufficient integration across academia, industry, and government. [\u003cspan citationid=\"CR32\" class=\"CitationRef\"\u003e32\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colspan=\"2\" nameend=\"c5\" namest=\"c4\"\u003e \u003cp\u003eFoster structured partnerships; develop joint research platforms; integrate materials, digital technologies, and policy domains [\u003cspan citationid=\"CR68\" class=\"CitationRef\"\u003e68\u003c/span\u003e, \u003cspan citationid=\"CR18\" class=\"CitationRef\"\u003e18\u003c/span\u003e].\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003c/div\u003e"},{"header":"5 Results","content":"\u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eNanomaterials\u003c/b\u003e enhance the properties of core building components, densify the microstructure in cement, and improve durability. Nano-coatings create long-lasting barriers against dirt, moisture, UV radiation, and chemicals, reducing maintenance requirements.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eEnvelope Technologies\u003c/b\u003e and Thermal Regulation: Smart glazing controls solar gain, lowering HVAC needs. Advanced insulation, such as aerogels and PCMs, stabilizes indoor temperatures; PCMs enhance thermal storage and reduce peak temperatures (~\u0026thinsp;1\u0026ndash;10\u0026deg;C), with payback in ~\u0026thinsp;4\u0026ndash;10 years.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eRenewable integration\u003c/b\u003e in desert conditions reveals that building‑integrated photovoltaics (BIPV) remain effective even under soiling challenges typical of desert environments. Hydrophilic nano‑coatings boost PV output by 18%, resulting in a 3.9-year cost-recovery period. Operational enhancements through smart systems\u0026mdash;such as IoT sensors, Building Management Systems (BMS), AI analytics, and digital twins\u0026mdash;support real-time monitoring, adaptive controls, predictive maintenance, and better decision-making. These advancements contribute to improved energy performance and service quality at both the building and district levels.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eOperationally\u003c/b\u003e, IoT‑based sensing, AI analytics, and digital‑twin control systems enhanced building responsiveness through real‑time monitoring, adaptive HVAC regulation, and predictive maintenance \u0026mdash; collectively improving energy efficiency, indoor environmental quality, and overall system resilience.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eQuantitative\u003c/b\u003e Outcomes and Saudi Evidence: Synthesis across sources indicates up to ~\u0026thinsp;30% carbon emission reduction and notable energy performance gains when nano-enhanced materials and smart city technologies are applied in tandem. Saudi case studies (e.g., residential compounds, campuses, smart city districts) report energy savings of up to ~\u0026thinsp;30%, improved comfort, and positive life-cycle economics.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e"},{"header":"6 Discussion","content":"\u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eMechanism of System-Level Value: Passive\u0026ndash;Active Synergy: Findings align around a complementary logic: nanomaterials reduce baseline loads and prolong material lifetimes (passive resilience), while smart systems continually optimize operation based on weather and occupancy (active control). Their integration supports high-performance buildings and resilient urban systems.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eSaudi Implementation Landscape: National strategies emphasize green materials, energy and water efficiency, renewable energy (including BIPV), and waste reduction, thereby creating an enabling environment for integrated solutions. projects\u0026mdash;KAFD, NEOM, and Mohammed Bin Salman Non-profit City\u0026mdash;demonstrate feasibility through efficient fa\u0026ccedil;ades, solar integration, smart HVAC/controls, and connected services. Nevertheless, mainstream adoption of smart buildings remains in its early stages, with many assets still built and operated conventionally.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eOverall, sustainable construction in Saudi Arabia is not simply a shift in material choices or digital practices. It represents a systemic transformation\u0026mdash;integrating innovative materials, smart technologies, improved design methods, and stronger regulatory frameworks to create buildings and cities that meet present needs while safeguarding future generations.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eAdoption Barriers and Enablers: Persistent barriers mirror global gaps: economic feasibility and upfront capital, skills and training shortages, data standardization/interoperability, and fragmented integration frameworks. Targeted interventions open standards across BIM/IoT/digital twin ecosystems, focused workforce upskilling, and procurement/coding guidance that recognize lifecycle value\u0026mdash;are pivotal to translating technical potential into routine practice.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003ePolicy and Practice Implications: Three priorities emerge:\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003cp\u003ea) Codify integration of nano-enhanced materials and smart systems in codes/specifications with performance-based compliance paths; b) Mitigate first costs via incentives and lifecycle-costing frameworks recognizing durability and O\u0026amp;M savings; c) Invest in capacity across design, materials, analytics, and cyber-secure operations. Collectively, these steps align with the Kingdom\u0026rsquo;s sustainability strategy and accelerate measurable performance at building and district scales.\u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eLimitations: Generalizability is constrained by (i) limited long-term health and environmental data on certain nanomaterials under chronic exposure, and (ii) the context dependence of smart-technology outcomes (infrastructure readiness, user acceptance, governance). Gaps persist in standardized LCA and risk-evaluation protocols across both domains.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003ePriority Directions for Future Research\u003c/b\u003e: Immediate opportunities include: Saudi-specific comparative studies (simulation\u0026thinsp;+\u0026thinsp;field monitoring) contrasting standard vs. integrated buildings to quantify energy, water, comfort, and economic outcomes; localized techno-economic and safety assessments for nano-enhanced materials (including end-of-life and exposure pathways); and integration trials that co-deploy PCMs/aerogels, switchable glazing, and anti-soiling BIPV with AI-enabled BMS/digital twins to identify optimal design\u0026ndash;operation bundles and payback ranges.\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003e \u003cb\u003eConcluding Perspective\u003c/b\u003e: A materials-plus-intelligence strategy\u0026mdash;pairing nano-enhanced envelopes with data-driven operations\u0026mdash;offers the clearest route to durable reductions in energy intensity, improved comfort, and lower lifecycle costs for Saudi buildings, provided that standards, skills, and governance advance in parallel.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e"},{"header":"7 Conclusion","content":"\u003cp\u003eThis review demonstrates that integrating nanomaterials with smart technologies provides a robust pathway for advancing high-performance and low-carbon construction in Saudi Arabia. Nano-enhanced materials\u0026mdash;such as nano-modified concrete, nano-coatings, smart glazing, aerogels, PCMs, and BIPV\u0026mdash;offer significant improvements in durability, thermal performance, and environmental efficiency, supporting long-term resilience in hot, arid climates. On the operational scale, smart systems, including IoT sensors, AI-driven analytics, BMS platforms, and digital twins, offer real-time monitoring, adaptive control, and predictive maintenance. Their combined application in Saudi building projects has already demonstrated energy savings of up to 30% and improved indoor comfort, underscoring the complementary value of integrating passive material innovations with active intelligent optimization.\u003c/p\u003e \u003cp\u003eDespite these benefits, adoption remains limited due to high initial costs, scarce long-term health and environmental data on nanomaterials, interoperability issues, and shortages in digital and materials science expertise. Addressing these constraints requires a coordinated national framework that aligns with Saudi Vision 2030\u0026rsquo;s sustainability goals. Key priorities include embedding nano-enhanced materials and smart systems within building codes and performance-based standards, establishing lifecycle-costing and incentive mechanisms to overcome economic barriers, and expanding research and capacity-building programs focused on localized performance, risk assessment, and techno-economic evaluation.\u003c/p\u003e \u003cp\u003eOverall, the findings confirm that a materials-plus-intelligence approach\u0026mdash;pairing advanced nanomaterials with digitally enabled building operations\u0026mdash;offers one of the most effective strategies for reducing energy intensity, enhancing climate resilience, and improving lifecycle economics across Saudi Arabia\u0026rsquo;s construction sector. As the Kingdom accelerates its transition toward smart, decarbonized urban development, integrating these technologies at scale will be essential to achieving durable, measurable sustainability outcomes.\u003c/p\u003e"},{"header":"Declarations","content":"\u003cp\u003eAcknowledgment\u003c/p\u003e\n\u003cp\u003eThe author extends his sincere appreciation to all individuals and institutions at Najran University who supported the preparation and publication of this work\u003c/p\u003e\n\u003cp\u003eCompeting interests\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eThe author declares that he has no relevant financial or non-financial interests to disclose.\u003c/p\u003e\n\u003cp\u003eFunding\u0026nbsp;\u003c/p\u003e\n\u003cp\u003eThe author declares that no funds, grants, or other support were received during the preparation of this manuscript.\u003c/p\u003e\n\u003cp\u003eEthics declaration\u003c/p\u003e\n\u003cp\u003eNot applicable\u003c/p\u003e\n\u003cp\u003eClinical Trial Number\u003c/p\u003e\n\u003cp\u003e\u0026nbsp;Not applicable\u003c/p\u003e\n\u003cp\u003eConsent to Participate Declaration\u003c/p\u003e\n\u003cp\u003e\u0026nbsp;Not applicable\u003c/p\u003e\n\u003cp\u003eConsent to Publish declaration\u003c/p\u003e\n\u003cp\u003eNot applicable\u003c/p\u003e\n\u003cp\u003eData Availability\u003c/p\u003e\n\u003cp\u003eNot applicable\u003c/p\u003e\u003ch2\u003eAuthor Contribution\u003c/h2\u003e\u003cp\u003eShukri Mohammed Elbellahy: Literature Review, Conceptualization, Methodology, Data analysis, Writing the original draft, Corresponding author.\u003c/p\u003e"},{"header":"References","content":"\u003col\u003e\u003cli\u003e\u003cspan\u003eAl-Tamimi N, Qahtan A, Alotaibi BS, Abuhussain MA. 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Future Generation Comput Syst. 2020;107:1061\u0026ndash;76. \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.future.2017.12.057\u003c/span\u003e\u003cspan address=\"10.1016/j.future.2017.12.057\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e\u003c/ol\u003e"}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":true,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":false,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"discover-sustainability","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"disu","sideBox":"Learn more about [Discover Sustainability](https://www.springer.com/43621)","snPcode":"","submissionUrl":"","title":"Discover Sustainability","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Discover Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Nanomaterials, Smart technologies, Sustainable Construction, Building Energy Efficiency, Saudi building sector","lastPublishedDoi":"10.21203/rs.3.rs-9342985/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-9342985/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eSaudi Arabia\u0026rsquo;s commitment to achieving net‑zero emissions by 2060 has positioned the building sector\u0026mdash;one of the Kingdom\u0026rsquo;s highest energy-consuming industries\u0026mdash;as a priority for decarbonization. This review synthesizes recent research on the integration of nanomaterials and smart technologies to support sustainable construction in hot arid regions, with a focus on the Saudi context. Nanomaterials, such as nano‑enhanced concrete, coatings, glazing, and insulation, demonstrate significant potential to improve structural durability, reduce thermal loads, and lower life-cycle environmental impacts. At the operational level, smart technologies\u0026mdash;including Internet of Things (IoT)-enabled systems, Artificial Intelligence (AI)-driven controls, digital twins, and advanced building management systems\u0026mdash;enable real‑time optimization and predictive maintenance, with evidence from Saudi case studies showing energy savings of up to 30%. Despite these benefits, adoption within the Kingdom remains limited due to data gaps, high upfront costs, regulatory uncertainty, interoperability challenges, and shortages in specialized skills. The analysis highlights opportunities to strengthen performance, enhance energy efficiency, and support climate resilience, while emphasizing the need for improved risk assessment, localized cost\u0026ndash;benefit studies, and clearer regulatory pathways. The study concludes with strategic recommendations addressing standardization, capacity building, and lifecycle‑based decision frameworks to accelerate the integration of these technologies. By bridging critical knowledge gaps and aligning with Saudi Vision 2030 sustainability objectives, the combined use of nanomaterials and smart systems offers a viable pathway toward high‑performance and low‑carbon buildings in Saudi Arabia.\u003c/p\u003e","manuscriptTitle":"Integrating smart technologies and nanomaterials to promote sustainable construction in Saudi Arabia's building sector","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-05-09 00:19:24","doi":"10.21203/rs.3.rs-9342985/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2026-05-06T10:15:58+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-05-05T14:21:19+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-05-05T08:44:07+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-04-29T20:31:23+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"184877359655933114010856671398373472785","date":"2026-04-25T11:40:33+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"18865526925070802999364619297725440553","date":"2026-04-25T01:23:35+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"230384903883420214111840673408293406678","date":"2026-04-24T18:23:07+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2026-04-24T13:05:23+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2026-04-24T12:45:49+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2026-04-24T11:40:37+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2026-04-21T05:59:37+00:00","index":"","fulltext":""},{"type":"submitted","content":"Discover Sustainability","date":"2026-04-21T05:54:05+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"discover-sustainability","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"disu","sideBox":"Learn more about [Discover Sustainability](https://www.springer.com/43621)","snPcode":"","submissionUrl":"","title":"Discover Sustainability","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Discover Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"36412362-1b06-4683-84da-3c2bfb0f0bf9","owner":[],"postedDate":"May 9th, 2026","published":true,"recentEditorialEvents":[{"type":"decision","content":"Revision requested","date":"2026-05-06T10:15:58+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-05-05T14:21:19+00:00","index":26,"fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-05-05T08:44:07+00:00","index":25,"fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-04-29T20:31:23+00:00","index":24,"fulltext":""}],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2026-05-16T08:08:34+00:00","versionOfRecord":[],"versionCreatedAt":"2026-05-09 00:19:24","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-9342985","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-9342985","identity":"rs-9342985","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}