Home insulation in London
£585 to £9,114 installed, and 36% of homes in the council area rated EPC D to G.
What insulation costs in London
Loft only
£585–£1,395
Saves up to £233 a year. Pays back in about 4 years.
Loft + cavity walls (most common)
£2,301–£5,487
Saves up to £478 a year. Pays back in about 7 years.
Full package
£3,822–£9,114
Saves up to £546 a year. Pays back in about 11 years.
Source: Home Energy Quotes Cost Index, costs modelled September 2026, savings at the October to December 2026 price cap. Prices are estimates and include installation and VAT. Actual costs may vary.
London in numbers
Published statistics for the Westminster council area, not our estimates.
36% of homes with an EPC in the Westminster council area are rated D to G, and the median energy score is 71, which is band C. The council is part of a Warm Homes: Local Grant consortium led by Greater London Authority, allocated £53,470,024 in principle across the consortium for April 2025 to March 2028.
| Westminster council area | Figure | Source |
|---|---|---|
| Homes with an EPC rated D to G | 36% | ONS, EPCs lodged to March 2025 |
| Median EPC energy score | 71 (band C) | ONS, EPCs lodged to March 2025 |
| Warm Homes: Local Grant, 2025 to 2028 | £53,470,024 to the consortium led by Greater London Authority | DESNZ, list updated July 2026 |
| Households on mains gas heating only | 56.2% | Census 2021, ONS |
| Electricity network operator | UK Power Networks (London) | NESO licence area boundaries |
These are published official statistics for the Westminster council area, which covers London, not Home Energy Quotes estimates. Sources checked 6 October 2026.
Is London a good place for home insulation?
The area’s housing stock includes a range of properties suited to home insulation installations throughout London. Combined with South East’s energy prices, home insulation installations here may offer good value (individual results will vary).
London has a population of 8,900,000, and the area falls within the South East region. We recommend getting at least 3 quotes to compare prices.
Find Installers in London
We recommend getting at least 3 quotes from qualified installers before making a decision. Check reviews, ask for local references, and make sure warranties are clearly stated in writing.
What to check before hiring an installer in London
- Qualifications — check the installer holds relevant qualifications and certifications for home insulation before signing any contract
- Local references — ask for completed jobs in London or Greater London
- Reviews — check online reviews before committing
- Warranty — product and workmanship warranties should be clearly stated in writing
- 3 quotes minimum — we recommend comparing at least three quotes to ensure you get a fair price
Questions about home insulation in London
How much does home insulation cost in London?
How energy efficient are homes in London?
Is there a grant for home insulation in London?
The Warm Homes: Local Grant may fund insulation and low-carbon heating in London for homes in England with an EPC rating of D to G, where household income is usually £36,000 or less or someone receives certain benefits.
How long is the payback period in London?
Do I need planning permission in London?
How do I find a good installer in London?
Get quotes for your home in London
Up to three approved installers who cover London may contact you. Free, no obligation.
Home Insulation in nearby towns
Last reviewed: . Costs are modelled estimates from the Home Energy Quotes Cost Index — see how we calculate them. Grant rates are checked against GOV.UK.