Cardiff EPC ratings

Over the last 4 quarters, 10,274 domestic Energy Performance Certificates were lodged in Cardiff. 73.7% were rated C or better, 9.2 points above the England and Wales average of 64.5%. That puts Cardiff at 26 of 320 local authorities. The most common recent band is C. These figures cover certificates lodged when homes were built, sold or let, so they lean towards housing that recently changed hands rather than the whole stock.

73.7%rated C or better, last 4 quarters
26of 320 local authorities
191,816certificates since 2008
82.4 m²average floor area per certificate

Band distribution

Last 4 quarters

A 7.6%B 17.3%C 48.8%D 22.9%E 2.7%F 0.4%G 0.3%

All certificates since 2008

A 0.9%B 10.4%C 37.4%D 37.4%E 11.5%F 1.9%G 0.5%

Certificates lodged by quarter

Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026

Postcode districts in Cardiff

CF10 · CF11 · CF14 · CF15 · CF23 · CF24 · CF3 · CF5

Radon potential in Cardiff

59.1% of postcodes in Cardiff sit in a radon Affected Area, where at least 1 home in 100 is estimated to be at or above the radon action level. 12.7% are in the two highest classes, where at least 1 home in 10 is affected. The highest class found in the area is 5 of 6. Check any postcode on the radon map.

Contains British Geological Survey and UK Health Security Agency data © BGS/UKHSA, and Ordnance Survey Code-Point Open data © Crown copyright and database right, used under the Open Government Licence v3.0.

Similar-ranked areas

Central Bedfordshire74.2%C or better · #23Newham74.2%C or better · #24Barnet73.8%C or better · #25Liverpool73.4%C or better · #27Oldham73.3%C or better · #28North Tyneside73.3%C or better · #29
Want the certificate for a specific address in Cardiff? Use the official lookup: find an energy certificate on gov.uk. If your home is rated D or below, start with how to improve your EPC rating.
Source: MHCLG, Live tables on Energy Performance of Buildings Certificates, Table D1 (by local authority), published under the Open Government Licence v3.0. Data covers domestic certificates lodged up to 2026 Q2. Retrieved and last checked on 2026-09-06. Read more on how we handle the data.