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EPC Momentum Index · September 2026

EPC ratings in Cardiff

501 existing homes in Cardiff got a new EPC rated C or better in September 2026, 66% of the month's new certificates. Every privately rented home must be rated C by 1 October 2030, 1,449 days away.

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New EPCs at C or better, September 2026

501

up 12% on the previous month

Share of the month's new EPCs at C or better

66%

England and Wales: 63%

EPCs from the last 10 years still below C

40%

259th highest of 317 councils

Estimated homes that moved up to C, September 2026

about 125

homes whose previous EPC was below C

Month by month

New EPCs for existing homes in Cardiff, and how many were C or better.

  1. October '25539 / 797
  2. November '25481 / 709
  3. December '25378 / 549
  4. January '26373 / 561
  5. February '26471 / 690
  6. March '26511 / 751
  7. April '26455 / 665
  8. May '26391 / 588
  9. June '26491 / 745
  10. July '26502 / 738
  11. August '26449 / 666
  12. September '26501 / 757

Green: rated C or better. Grey: all new EPCs that month. New builds are left out.

EPCs on record, by band

99,913 certificates lodged in Cardiff in the last ten years.

  • A1%
  • B14%
  • C45%
  • D33%
  • E6%
  • F1%
  • G0%

Bands D to G are below the 2030 standard. A C lodged before 1 October 2029 counts until it expires, and under the government's proposed new metrics a gas boiler can't score above D on heating, so a gas-heated C may need checking too.

What this means for landlords in Cardiff

Below C today. From 1 October 2030 the home can't be let until it reaches C, with a cost cap of £10,000 and exemptions for homes that can't get there. Spend from 1 October 2025 counts. The rules · Exemptions

Rated C already. Lodged before 1 October 2029, it counts until it expires. Gas-heated homes should check whether the C survives the proposed new metrics. The new metrics

Help with the cost. Warm Homes: Local Grant funds a landlord's first D–G property at up to 100% where tenants are on a low income, through the council, until March 2028. Grants and the eligibility checker

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Nearby councils

Source and method

Energy Performance of Buildings Register (MHCLG), Open Government Licence v3.0, data to the end of September 2026. Existing homes only (RdSAP assessments); a home with several certificates is counted once per certificate. "Moved up to C" is estimated from a sample of the month's C-or-better certificates checked against each home's previous EPC. Monthly shares are hidden below 30 certificates. Rankings cover councils with at least 1,000 certificates on record. See how we count.