Review of retrofit assessment in Scotland for improving home energy efficiency: technical report.

In November 2024 the Scottish Government commissioned a team led by Glasgow Caledonian University, Robert Gordon University, Carbon Futures, and Bield Housing and Care to conduct a review to support the design of a Home Energy Efficiency Technical Suitability Assessment (HEETSA). The research for this project combined a series of four workshops and a survey, supported by a light-touch literature search, and peer-reviewed by a panel of three experts selected for their specialist expertise. This Technical Report includes a summary of the background to this research, a full summary of the methodology, a list of stakeholders contacted about the project, and a non-exhaustive list of written sources that informed the work. The work was originally intended to be published as a single, short, final report. However, thanks to an unexpectedly high level of engagement with the project, the publication has been expanded in order to more accurately reflect the volume of evidence gathered, and the views of participants. Rather than significantly extend the intended single report, the research team recognised the benefits of splitting the work into two reports - this Technical Report and a more accessible Policy Report with clear recommendations. By publishing this Technical Report, we are recognising that some of the evidence gathered from our participants was very nuanced, with differing levels of agreement, sometimes over very specific and technical points, and with considerable overlaps in the discussions under each objective. Therefore, its purpose is to enable us to be as transparent as possible as to how we arrived at the text of the Policy Report. We encourage readers to begin by reading the Policy Report and use it as a jumping off point to consult the relevant sections of this Technical Report. Finally, we wish to thank all our participants and all those who have supported this work.