Cost to upgrade a home to EPC band C
Upgrading a UK home to EPC band C costs about £7,480 on average, according to English Housing Survey data. Industry cost analyses put a one-bedroom flat at roughly £3,653 and a large detached house around £12,540. A reasonably efficient home that only needs loft top-up, draught-proofing and controls can often move from D to C for £1,000 to £2,000. Eligible households can cut the bill with grants.
Typical cost by property type
| Property | Cost to reach band C | Notes |
|---|---|---|
| One-bedroom flat | around £3,653 | From EPC D to C |
| Small mid-terrace house | up to £6,400 | From EPC D to C |
| Average home (all types) | around £7,480 | English Housing Survey average |
| Large detached house | around £12,540 | Older, harder-to-treat stock costs more |
Common measures and what they cost
| Measure | Typical cost | Notes |
|---|---|---|
| Loft insulation top-up | £300 to £600 | If existing depth is low |
| Cavity wall insulation | £800 to £1,500 | Where walls are suitable |
| Draught-proofing and heating controls | £200 to £500 | Low-cost EPC points |
| A reasonably efficient home, D to C | £1,000 to £2,000 | If only minor measures are needed |
Last updated 2026-06-24. Compiled by VettedHome from the English Housing Survey and published 2026 retrofit cost guides. Figures are indicative averages; older and harder-to-treat homes cost more. The government has proposed requiring privately rented homes to reach EPC C by 2030 (consultation stage, verify the current rule before acting).
Common questions
What is the cheapest way to improve an EPC?
Loft insulation top-up, draught-proofing and better heating controls are the lowest-cost points. Many reasonably efficient homes move from D to C for £1,000 to £2,000.
Why does my detached house cost so much more?
Larger and older homes have more wall and roof area and are often harder to treat, so the average detached upgrade (around £12,540) runs well above the £7,480 all-homes average.
Can grants reduce the cost?
Yes. Eligible households can cut the cost substantially through schemes such as the Boiler Upgrade Scheme (heating) and insulation grants. Eligibility depends on income, property and area.
Planning an upgrade?
We match homeowners and landlords with vetted insulation and heating installers. Compare quotes before you commit.
See energy upgrade guidance →Sources: English Housing Survey (£7,480 average) · industry retrofit cost analyses (by-type figures).