Notable findings
Patterns that stand out when you look at every UK Energy Performance Certificate at once.
Most efficient local authorities
Authorities with the highest average current efficiency score. Sample size at least 500 certificates.
Least efficient local authorities
Authorities with the lowest average current efficiency score. Sample size at least 500 certificates.
Biggest improvement potential by authority
Authorities with the largest gap between average current and average potential efficiency. The biggest collective wins if every recommendation were carried out.
Oldest certificates still on the register
EPCs are valid for 10 years; these are the oldest still recorded and likely overdue a refresh.
Newest A-band properties
Most recently lodged certificates rated band A. These are almost always new build or freshly retrofitted.