What percentage of homes in Gwynedd are below EPC band C?

70.0% of rated homes in Gwynedd are below EPC band C (as of 2026-Q2) — 26,144 of 37,348 rated dwellings. Source: The Home Index, from EPC Open Data under the Open Government Licence.

How many homes in Gwynedd need upgrading to reach EPC band C?

26,144 rated dwellings in Gwynedd sit below EPC band C and would need improvement to reach the band-C standard.

How does Gwynedd rank for the EPC band C retrofit gap?

Gwynedd ranks #2 for the widest retrofit gap among local authority areas in England and Wales.

Local authority diagnosis

Gwynedd

Name: The Home Index — Gwynedd
Creator: The Home Index
License: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/

W06000002vintage 2026-Q2#2 by retrofit gap

In Gwynedd, 26,144 rated homes sit below EPC band C. That puts the area at #2 for the widest gap among local authority areas in England & Wales.

Direction of travel

Not on track at the current rate

Projection from the 15-year rated-stock trend; not a forecast.

Retrofit gap

70.0%

of 37,348 rated domestic dwellings are below band C.

EPC Open Data · Open Government Licence · free to cite with attribution.

Homes below band C

26,144

League rank

1 = widest gap.

Cost to reach band C

£295.3m(modelled estimate of the cost to reach band C)

Position and trajectory

Is the gap closing?

The latest position for Gwynedd, set against the recent direction of travel.

Fig.1Retrofit gap over time

Stock · year-end

Share of Gwynedd's rated dwellings below band C at each year-end, ending at its headline 70.0%. Tracks every home by its latest certificate. EPC register.

Land Registry × EPC — matched-sale signals

What is at stake in the local market

We match HM Land Registry sales to EPC certificates: price per m², below-C matched-sale exposure, the observed C-or-above price/m² spread, and transaction-rate signals. Modelled estimates, shown with match coverage; not valuations. Methodology

Matched-sale exposure

£4.0bn

estimate for below-C stock; not a valuation.

Median sale price

£214k

typical matched sale here.

Matched sale £/m²

£2,253/m²

median, from matched sales.

Spread vs cost

0.27×

observed C+ price/m² spread ÷ modelled cost-to-C.

50.7% coverageMatched-sale estimate from recent HM Land Registry sales. Not a valuation. Methodology.

Matched sale £/m²

£2,253/m²

Matched-sale exposure

£4.0bnmatched-sale estimate of below-C rated stock value; not a valuation

C+ sale-price premium — size/type/location controlled

+12.5%

Homes rated C or better sell for ~+12.5% more per m², holding size, type and location constant (95% CI +12.5%–+12.5%).

Below-C transaction rate

1.42×

Local context

Fuel poverty & deprivation here

WIMD provides current local deprivation context. The latest Welsh fuel-poverty estimate is national only, so no local percentage is inferred for this authority.

Neighbourhoods in the most-deprived 10%

4.0%

share of LSOAs in the most-deprived national decile · Welsh Index of Multiple Deprivation 2025.

Private rented sector

The rented-stock cut

75.6% (based on 91.0% tenure coverage)

Make it specific

Area averages cannot tell you what one home needs.

Check a real address in Gwynedd for its EPC, running costs, route to band C and available support. Landlords can then compare that home across a portfolio.

Check a home →Check a portfolio →

Prefer a general estimate? Model a home type in the cost calculator.

For local reporters: this is Gwynedd's citable figure — copy the line below or embed the live widget, free to use with attribution.

Cite this figure / embed

Citation

The Home Index (2026-Q2): Gwynedd has a retrofit gap of 70.0% — the share of rated homes below EPC band C. Source: EPC Open Data (Open Government Licence).

Embed this figure

<iframe src="https://thehomeindex.org/embed/lad/W06000002" width="320" height="200" style="border:0" title="The Home Index — Gwynedd" loading="lazy"></iframe>