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Home Insulation

Home Insulation in London — 2026 Guide

By Meera Patel, Contributor · Updated April 2026 · London, Greater London

Home Insulation hero image
Quick answer: Home Insulation in London cost between £570 and £4050 installed (2026 prices). The average homeowner may save an estimated £440 per year on energy bills. Government support: grants may be available for eligible installations.
£1740
Est. installed cost
£440/yr
Est. annual saving
~6 yrs
Est. payback
1625 hrs
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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.

London

Home Insulation Costs in London (2026)

System size Typical cost Est. annual saving Est. payback
Loft only £320–£860 £220/yr 7 yrs
Loft + cavity walls (most common) £920–£2290 £470/yr 6 yrs
Full package £2290–£5010 £740/yr 5 yrs

Source: Green Reach Energy research, March 2026. Prices are estimates and include installation and VAT. Actual costs may vary.

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Available Grants in London

A government energy efficiency grant is available for eligible installations.

Home Insulation grants in London

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.

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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
Home Insulation installer in London

Frequently Asked Questions

How much do home insulation cost in London?
Home Insulation in London cost between £570 and £4050 installed. A typical mid-range system costs around £1740 including installation and VAT (estimated, based on our research).
Is there a grant for home insulation in London?
Yes. The government energy efficiency grant (amounts vary by eligibility) is available for eligible installations. Use a qualified installer to claim it.
How long is the payback period in London?
The estimated payback period in London is around 6 years, based on estimated annual savings of around £440. Actual payback depends on your property type, current insulation level and heating system.
Do I need planning permission in London?
Most home insulation installations fall under permitted development rights and do not require planning permission. However, listed buildings, conservation areas and flats may need approval. Always check with your local planning authority in London before installation.
How do I find a good installer in London?
We recommend getting at least 3 quotes from qualified installers. Check online reviews and verify that the installer holds relevant qualifications before signing any contract.