Edinburgh Napier University

  The demand for energy efficient retrofitting in residential buildings is rising, particularly in the UK, which has some of the oldest housing stock in Europe. Existing retrofit strategies primarily focus on operational energy savings while overlooking embodied carbon and holistic impact. This study addresses identified gaps through a case study analysis of a 1950s bungalow retrofit which included layout re-configuration for modern contemporary living whilst maximising solar gain and, integration of renewable energy solutions with increased footprint and fabric performance utilising timber modern methods of construction (MMC). Adopting a "Living Lab" methodology the project spanned two phases (2011-okay 2017 and 2021-2024) involving systematic in-situ measurements, Life Cycle Assessment (LCA), and building performance analysis. The project undertaken has resulted in a substantial reduction in operational carbon emissions combined with low embodied carbon impact as a result of using sustainable materials and a local supply chain, with further environmental benefit when carbon sequestration is considered. The outcomes therefore support the use of timber MMC for retrofit as a viable, scalable solution for residential buildings offering a replicable model in the drive for net zero carbon impact. Highlights The research case study is a practical demonstration of retrofit and property extension utilising offsite timber MMC and renewable technologies. The audience should anticipate taking away: • A comprehensive analysis coordinated by LCA of the staged retrofit to address embodied carbon impacts. • An evidence base for the use of timber MMC as a method for significantly reducing the embodied carbon impact of retrofit. • A demonstration of a phased retrofit strategy that integrates renewable energy solutions to reduce operational energy demand and associated carbon impacts.