External wall insulation in Carshalton
Looking for external wall insulation in Carshalton? We survey homes across Greater London and the SM5 postcode district, measure every wall and give you a fixed price in writing before any work is booked.
Homes in and around Carshalton
Carshalton is in the SM5 postcode district, about 10 miles from London. 6 other towns we cover are within 25 miles.
From Carshalton we also cover Wallington (1 miles away), Sutton (2 miles) and Mitcham (2 miles).
Whatever the exposure of your street, the details at sills, eaves and the base of the wall are what keep an EWI system dry, and we draw them before work starts.
Nearby towns we cover: Wallington (1 mile), Sutton (2 miles), Mitcham (2 miles), Morden (2 miles), Croydon (3 miles), South Croydon (3 miles).
External wall insulation prices in Carshalton
Guide prices for external wall insulation in Carshalton 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.
What moves the price most is the board and finish you choose, the access around the house, and details such as roofline extensions or moving a gas meter.
Popular services in Carshalton
- Mineral wool EWI
- Phenolic EWI
- Wood fibre EWI
- Brick slip EWI
- Solid wall insulation
- Bungalow EWI
- Flats & low-rise blocks
- Social housing EWI
- EWI for landlords
- EWI surveys
- All 24 services
Rules that apply in Carshalton
- 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 Carshalton: questions
How much should I budget for external wall insulation in Carshalton?
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 Carshalton and fixes the total in writing.
Is VAT charged on external wall insulation in Carshalton?
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 Wallington as well as Carshalton?
Yes. From Carshalton we also cover Wallington, Sutton and Mitcham, and the rest of Greater London.