Upgraded Intelligence has found that 1,883,842 homes in England and Wales had an earliest usable Energy Performance Certificate rating below C and a latest usable rating of C or above.
The analysis covers 7,656,746 homes with usable assessments on at least two different dates, linked by the same property reference. A further 444,123 homes crossed the threshold in the opposite direction.
Across this same group, the share rated C or above was 35.88% at the first usable assessment and 54.68% at the latest. Homes that remained below C numbered 3,025,757, while 2,303,024 remained at C or above.
What the comparison measures
The assessment dates span 21 September 2008 to 31 October 2026. Each home contributes its own first and latest usable assessment, so the time between them varies. These figures are not a change over one common annual period.
Homes with repeated certificates are a selected group. The findings do...