Housing Stock and Utilities Under the Highest Temperature

In Japan, extensive consideration is given to utilising ageing housing complexes as part of the housing stock. However, when renovating old buildings, some prioritise costs but neglect energy consumption. While insulation retrofitting is a highly effective measure, it often becomes unaffordable due to competing priorities, such as design improvements and ensuring airtightness. To date, there has been little academic analysis of the costs and energy conservation benefits of retrofitting existing housing stock. This study aims to analyse the cost and energy efficiency of ageing housing complexes, such as apartment buildings. The evaluation focuses on the cost and energy consumption of an old apartment building, with findings showing that ceiling insulation has a significant impact. The collected data are presented in numerical form, providing practical results for designers to utilise in their projects.