EPC Ratings in Gwynedd: How Many Homes Are Below Band C Before the 2030 Rule
Of the 3,483 homes in Gwynedd that had an EPC lodged from July 2025 to June 2026, 59% were rated D to G — the bands a privately rented home must leave by 1 October 2030. The Wales figure is 42%; England and Wales 40%.
EPC bands in Gwynedd, July 2025 to June 2026
| Rating | Certificates | Share |
|---|---|---|
| Band A | 58 | 1.7% |
| Band B | 244 | 7.0% |
| Band C | 1,134 | 33% |
| Band D | 1,112 | 32% |
| Band E | 635 | 18% |
| Band F | 197 | 5.7% |
| Band G | 103 | 3.0% |
59% below C (bands D to G) against 42% in Wales and 40% across England and Wales. Gwynedd ranks 5 of 318 local authorities for the share below C (1 = highest share). Since 2008, 55,221 EPCs have been lodged for existing homes in Gwynedd and 78% of them were below C — recent certificates run better than the long-run stock because newer and improved homes transact more.
The deeper problem here is the bottom of the scale. 27% of recent certificates in Gwynedd were E, F or G — against 9.3% in Wales. F and G have been unlettable since the 2018–2020 minimum-E rules unless an exemption is registered, and an E-rated home has two bands to climb, not one; check the register before any new tenancy and budget for the cap being reached.
Is Gwynedd moving towards C?
Little movement year on year in Gwynedd: 60% of certificates were below C in July 2024 to June 2025 and 59% in July 2025 to June 2026 (−1.6 points; England and Wales −2.5 points). The area is 190th of 318 for the size of its year-on-year change, so the picture here is stable rather than shifting.
Average floor area per certificate is 89.1 m², close to the 87.1 m² England-and-Wales figure, so national cost guides apply here without much adjustment.
What the 2030 rule costs in Gwynedd
Privately rented homes need band C from 1 October 2030, with a £10,000 cap on what a landlord must spend before an exemption can be registered; the rules, exemptions and what counts towards the cap are on the EPC C for rentals by 2030 guide.
Put the £10,000 cap in local terms: average private rent in Gwynedd is £722 a month (ONS, July 2026), so the cap is roughly 13.9 months of rent — and every month a property stands empty for works costs another £722 on top of the bill. The area’s rents, prices and yields are on Gwynedd: rents, house prices and yield.
Whether the certificate and the works are deductible is on EPC, gas and electrical certificates: deductible? — revenue repairs come off the year’s rent, improvements that add capital value do not (allowable expenses guide).
Nearest neighbours in the ranking, in Wales
| Area | Below C | Year-on-year (pts) |
|---|---|---|
| Carmarthenshire | 58% | +1.5 |
| Pembrokeshire | 55% | −6.9 |
| Denbighshire | 54% | −1 |
| Isle of Anglesey | 53% | +3.3 |
| Ceredigion | 53% | −8.7 |
| Conwy | 51% | −6.5 |
All 318 areas ranked · council tax in Gwynedd 2026/27 · rent, prices and yield in Gwynedd.
MHCLG, Live tables on Energy Performance of Buildings Certificates, table EB1 — domestic EPCs lodged for existing dwellings by energy-efficiency band, published 30 July 2026, latest four quarters (July 2025 to June 2026) summed per local authority; cumulative figures from 2008. Contains public sector information licensed under the Open Government Licence v3.0. An EPC is lodged when a home is sold, let or newly built, so these are certificates issued, not a census of the housing stock. Shares, ranks and regional figures are ours, computed across 318 local authorities. Download: CSV.
Asked about EPCs here
Of EPCs lodged for existing homes from July 2025 to June 2026, 41% were band C or better and 59% were D to G; band D alone was 32%. (MHCLG live table EB1.)
The share below C moved from 60% (July 2024 to June 2025) to 59% (July 2025 to June 2026): −1.6 percentage points, against −2.5 across England and Wales.
From 1 October 2030 under the government's EPC consultation response, with a £10,000 spending cap before an exemption. Until then the minimum for a new letting is band E.
59% below C against 42% in Wales — a larger share needing work.
No — only homes with an EPC lodged in the period (sold, let or built). Since 2008 the cumulative share below C is 78%, higher because older certificates and unimproved homes sit in that total.