Internal wall insulation · Greater London
Internal wall insulation in Finchley
If you're planning internal wall insulation in Finchley, start with a free survey: we measure, check the walls and confirm planning and building control for your address. We plan internal insulation in Finchley homes room by room so you keep the rest of the house usable.
- Free survey in N3 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Finchley
Postcode, service and a phone number is all we need.
What you get
- Loses roughly 50–100mm per insulated wall
- Insulated plasterboard, stud wall or breathable systems
- Sockets, radiators, skirting and coving are moved and refitted
- Keeps the outside of the house exactly as it is
Homes and walls in Finchley
As well as Finchley itself, we quote in Muswell Hill, Cricklewood and Kilburn. 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.
Where a property in Finchley is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Postcode district
- N3
- County or area
- Greater London
- Nation
- England
- Nearby
- Muswell Hill, Cricklewood, Kilburn, Wood Green
Planning and building control in England
Planning isn't usually involved with internal insulation. Building control is, once more than half of a wall is treated, and listed buildings need listed building consent.
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 Finchley
| 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.
How it works
Enquiry
Send your postcode and a few details.
Measured survey
Walls, damp, eaves, cills and services recorded.
Written price
A fixed price with the specification attached.
Work and handover
Installed, inspected and documents handed over.
Internal wall insulation in Finchley: questions
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
How much room space will I lose?
Usually 50–100mm on each insulated wall, depending on the system.
What happens to my radiators and sockets?
They're taken off and refitted on the new wall face. Electrical work is done by a qualified electrician.
Do you cover Finchley?
Yes — we survey and quote internal wall insulation in Finchley (N3) and nearby Muswell Hill, Cricklewood and Kilburn, with a fixed written price before any work starts.