Analysis of 17.6 million EPC records identifies 4.3 million rated D or below with potential A or B
New EPC Atlas research finds more than half of lower-rated records examined show potential for an A or B rating, highlighting the scale of the gap between current and potential energy performance.
A major analysis of 17.6 million searchable Energy Performance Certificate records across England and Wales has identified 4,318,888 records that are currently rated EPC D or below but have a potential rating of A or B.
The 4.32 million records represent 24.50% of the entire research corpus and 50.41% of all records currently rated D or below. A narrower group of 2,481,531 records also carry owner-occupied tenure classification and House property type.
The analysis shows a strong descriptive construction-era divide. Pre-1900 records are 81.79% D-or-below, compared with 3.89% for the broad 2007-and-later group.
The study also identifies 1,733,755 House or Bungalow records that combine a D-or-below rating with a recorded numerical loft depth of 100 mm or less.
Key figures
- 8,567,591 records are current EPC D or below.
- 4,318,888 are D or below with potential A/B.
- 2,481,531 are additionally owner-occupied classification and Houses.
- 235,239 records explicitly show Solar PV.
- 299,719 contain recognized heat-pump evidence.
About the research
The EPC Atlas UK Data Book 2026 Volume One v0.3 analyses 17,624,989 searchable records across ten England-and-Wales regional datasets. Scotland and Northern Ireland are outside the research corpus.
About EPC Atlas
EPC Atlas is a UK property and energy-performance data research and intelligence project designed to make large-scale EPC evidence searchable, comparable and easier to analyse at national, regional and local level.