PARLIAMENTARY WRITTEN QUESTION
(15 July 2026)

The Department has funded evidence on the relationship between predicted and actual home energy performance through its publicly available EPC Accuracy Research. The research identified differences between modelled EPC energy use and metered household energy consumption and found that these differences reflected a range of factors, including assumptions within methodologies, occupancy rates and changes to properties since EPCs were produced. The findings helped inform the development of RdSAP 10 and are informing the upcoming Home Energy Model to better reflect real-world building performance.