External wall insulation in Isleworth
Homeowners in Isleworth look at external wall insulation for warmer rooms, lower heat loss and a new exterior in one job. Here is how it works, what it costs and which England rules apply.
Homes in and around Isleworth
Isleworth is in the TW7 postcode district, about 10 miles from London. 6 other towns we cover are within 25 miles.
Our Isleworth surveys cover the TW7 district and the surrounding area, including Hounslow, Heston and Richmond.
Most EWI failures start at the edges rather than the middle of a wall, so the quote for your Isleworth home sets out how each detail will be built.
Nearby towns we cover: Hounslow (1 mile), Heston (2 miles), Richmond (2 miles), Southall (3 miles), Hanworth (3 miles), Feltham (4 miles).
External wall insulation prices in Isleworth
Guide prices for external wall insulation in Isleworth run from about £109 to £175 per square metre installed, depending on system and finish; scaffolding priced per house, with VAT at 0% on homes until 31 March 2027.
Brick slips, cladding and mineral wool cost more than EPS and render; the survey shows you the difference side by side.
Popular services in Isleworth
- EWI installation
- Wood fibre EWI
- Brick slip EWI
- Mineral & silicate render
- Pebbledash & dry dash EWI
- Terraced house EWI
- Park home insulation
- Flats & low-rise blocks
- EWI for landlords
- Failed EWI remediation
- All 24 services
Rules that apply in Isleworth
- Planning
- On a house, external wall insulation is usually permitted development if the finish looks similar to the existing walls. Render or cladding on a house in a conservation area, National Park, National Landscape (AONB), the Broads or a World Heritage Site needs planning permission. Flats and maisonettes have no householder permitted development rights, listed buildings need listed building consent, and an Article 4 direction can remove rights locally.
- VAT
- Installing insulation in a home is zero-rated for VAT until 31 March 2027, then 5%.
Checked October 2026. Rules change, so we confirm them for your address at survey.
External wall insulation in Isleworth: questions
How much should I budget for external wall insulation in Isleworth?
Budget around £109–£175 per square metre of wall for the system and finish, plus scaffolding priced per house. The survey measures your walls in Isleworth and fixes the total in writing.
Is VAT charged on external wall insulation in Isleworth?
Not on installing insulation in a home at the moment: that's zero-rated until 31 March 2027, after which the rate is due to be 5%. Work on commercial buildings is standard-rated.
Do you cover Hounslow as well as Isleworth?
Yes. From Isleworth we also cover Hounslow, Heston and Richmond, and the rest of Greater London.