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

56.9% of rated homes in Cornwall are below EPC band C (as of 2026-Q2) — 108,836 of 191,435 rated dwellings. Source: The Home Index, from EPC Open Data under the Open Government Licence.

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

108,836 rated dwellings in Cornwall sit below EPC band C and would need improvement to reach the band-C standard.

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

Cornwall ranks #39 for the widest retrofit gap among local authority areas in England and Wales.

Local authority diagnosis

Cornwall

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

E06000052vintage 2026-Q2#39 by retrofit gap

In Cornwall, 108,836 rated homes sit below EPC band C. That puts the area at #39 for the widest gap among local authority areas in England & Wales.

Direction of travel

On current pace, reaches band C by 2069

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

Retrofit gap

56.9%

of 191,435 rated domestic dwellings are below band C.

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

Homes below band C

108,836

League rank

#39

1 = widest gap.

Cost to reach band C

£1.2bn(modelled estimate of the cost to reach band C)

Position and trajectory

Is the gap closing?

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

Fig.1Retrofit gap over time

Stock · year-end

Share of Cornwall's rated dwellings below band C at each year-end, ending at its headline 56.9%. Tracks every home by its latest certificate. EPC register.

Cold Homes Index

60 / 100

#80 of 296 English local authorities (hardest to heat & fix). How it's built →

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

£26.9bn

estimate for below-C stock; not a valuation.

Median sale price

£306k

typical matched sale here.

Matched sale £/m²

£3,318/m²

median, from matched sales.

54.8% coverageMatched-sale estimate from recent HM Land Registry sales. Not a valuation. Methodology.

Matched sale £/m²

£3,318/m²

Matched-sale exposure

£26.9bnmatched-sale estimate of below-C rated stock value; not a valuation

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

+3.4%

Homes rated C or better sell for ~+3.4% more per m², holding size, type and location constant (95% CI +3.4%–+3.4%).

Below-C transaction rate

1.35×

Local context

Fuel poverty & deprivation here

Current official local-authority data for gauging household hardship, grant-funding focus and where retrofit support is targeted.

Households in fuel poverty

11.0%

DESNZ sub-regional fuel poverty (LILEE), England.

Neighbourhoods in the most-deprived 10%

3.3%

share of LSOAs in the most-deprived national decile · English Indices of Deprivation 2025.

Retrofit funding available here

Retrofit grants concentrate in areas like this — schemes that may help fund work on below-C homes in Cornwall:

Boiler Upgrade Scheme ↗ — £7,500 towards an air- or ground-source heat pump (or biomass).
Warm Homes: Local Grant ↗ — Insulation and low-carbon heating, delivered by your local authority.
Energy Company Obligation (ECO) / insulation schemes ↗ — Supplier-funded insulation and heating measures.

Schemes, eligibility rules and funding windows change. These are signposts, not an eligibility decision — confirm current rules via each scheme's official page. Eligibility usually depends on the household's income or benefits and the property.

Private rented sector

The rented-stock cut

65.9% (based on 83.7% tenure coverage)

Make it specific

Area averages cannot tell you what one home needs.

Check a real address in Cornwall 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 Cornwall'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): Cornwall has a retrofit gap of 56.9% — the share of rated homes below EPC band C. Source: EPC Open Data (Open Government Licence).

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