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EPC Momentum Index · September 2026

EPC ratings in Gwynedd

113 existing homes in Gwynedd got a new EPC rated C or better in September 2026, 43% 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

113

up 15% on the previous month

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

43%

England and Wales: 63%

EPCs from the last 10 years still below C

69%

2nd highest of 317 councils

Estimated homes that moved up to C, September 2026

about 58

homes whose previous EPC was below C

Month by month

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

  1. October '25126 / 334
  2. November '25107 / 313
  3. December '2554 / 170
  4. January '2684 / 219
  5. February '26116 / 322
  6. March '26153 / 366
  7. April '26235 / 436
  8. May '26125 / 275
  9. June '26117 / 275
  10. July '2699 / 267
  11. August '2698 / 244
  12. September '26113 / 264

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

EPCs on record, by band

32,171 certificates lodged in Gwynedd in the last ten years.

  • A2%
  • B6%
  • C23%
  • D31%
  • E22%
  • F11%
  • G5%

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 Gwynedd

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.