Internal wall insulation · Greater London
Internal wall insulation in New Malden
Looking for internal wall insulation in New Malden? We survey homes across New Malden and the KT3 area, then give you a fixed written price before any work starts. We plan internal insulation in New Malden homes room by room so you keep the rest of the house usable.
- Free survey in KT3 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in New Malden
Postcode, service and a phone number is all we need.
What's included
- Loses roughly 50–100mm per insulated wall
- Can be done one room at a time during a renovation
- Keeps the outside of the house exactly as it is
- Needs careful detailing at floor joists, reveals and corners
New Malden: walls, weather and approvals
As well as New Malden itself, we quote in Surbiton, Morden and Wimbledon. London's housing includes a large stock of Victorian and Edwardian solid-wall terraces, inter-war semis and post-war blocks, and conservation areas cover many streets — so planning is often the first question for external work.
Much of Greater London sits in the lower wind-driven rain exposure bands, which keeps the choice of finishes wide — though hilltop, coastal and exposed gable walls can still need a tougher specification, so we check the actual site.
For terraced homes in New Malden with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Postcode district
- KT3
- County or area
- Greater London
- Nation
- England
- Nearby
- Surbiton, Morden, Wimbledon, Mitcham
Approvals in England
Internal insulation rarely needs planning permission, but in England and Wales insulating or replastering more than half of a wall's area involves building control, and listed buildings need consent for internal changes that affect their character.
What are the risks with internal insulation?
Insulating inside makes the masonry colder, so moisture risk rises. Weak points are where floor joists bear into the wall, window reveals and corners. A condensation risk check for the build-up, a continuous vapour control layer where specified, and returning insulation into reveals deal with most of it.
Internal wall insulation prices in New Malden
| Item | Guide price | Notes |
|---|---|---|
| Insulated plasterboard, supplied and skimmed | £75–£110 per m²0% VAT | |
| Insulated stud wall | £90–£130 per m²0% VAT | |
| Typical bedroom, one external wall | £1,795–£2,9950% VAT | Including making good |
Confirmed by a fixed written quote after survey. 0% VAT: installing insulation in a home is zero-rated until 31 March 2027, so these figures are the total; 5% applies from 1 April 2027.
From enquiry to finished wall
Tell us about the property
Use the quote tool or form, or call. Photos help.
Free survey
We measure, check the walls and confirm approvals.
Fixed written quote
System, details, access, exclusions and VAT in writing.
Installation
Scheduled for suitable weather, with a clear programme.
Internal wall insulation in New Malden: questions
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
Is internal insulation cheaper than external?
Per m² usually yes, but the cost of moving fittings and redecorating narrows the gap on whole-house jobs.
How much room space will I lose?
Usually 50–100mm on each insulated wall, depending on the system.
Do you cover New Malden?
Yes — we survey and quote internal wall insulation in New Malden (KT3) and nearby Surbiton, Morden and Wimbledon, with a fixed written price before any work starts.