Merthyr Tydfil EPC ratings

Over the last 4 quarters, 2,120 domestic Energy Performance Certificates were lodged in Merthyr Tydfil. 76% were rated C or better, 11.5 points above the England and Wales average of 64.5%. That puts Merthyr Tydfil at 15 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.

76.0%rated C or better, last 4 quarters
15of 320 local authorities
32,937certificates since 2008
84.0 m²average floor area per certificate

Band distribution

Last 4 quarters

A 4.2%B 5.8%C 65.9%D 21.1%E 2.1%F 0.5%G 0.3%

All certificates since 2008

A 0.7%B 5.6%C 36.6%D 40.8%E 13.0%F 2.4%G 0.8%

Certificates lodged by quarter

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

Postcode districts in Merthyr Tydfil

CF46 · CF47 · CF48

Radon potential in Merthyr Tydfil

63.5% of postcodes in Merthyr Tydfil sit in a radon Affected Area, where at least 1 home in 100 is estimated to be at or above the radon action level. 16.6% 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

Crawley77.3%C or better · #12Knowsley76.5%C or better · #13Sunderland76.1%C or better · #14South Cambridgeshire75.6%C or better · #16Wandsworth75.3%C or better · #17Welwyn Hatfield74.9%C or better · #18
Want the certificate for a specific address in Merthyr Tydfil? 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.