Internal wall insulation · County Antrim
Internal wall insulation in Belfast
We quote internal wall insulation for homes in Belfast (BT1) and nearby Castlereagh and Newtownabbey, with guide prices online and a free survey to fix the price. We plan internal insulation in Belfast homes room by room so you keep the rest of the house usable.
- Free survey in BT1 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Belfast
Postcode, service and a phone number is all we need.
What's included
- Keeps the outside of the house exactly as it is
- Can be done one room at a time during a renovation
- Loses roughly 50–100mm per insulated wall
- Needs careful detailing at floor joists, reveals and corners
Homes and walls in Belfast
We also cover Castlereagh and Newtownabbey, close to Belfast. Northern Ireland has many rendered and pebble-dashed homes, older solid-walled rural houses, and estates built by the Housing Executive.
Parts of County Antrim fall in the higher wind-driven rain exposure bands, especially coastal and upland sites, so render specification, movement joints and detailing at cills, verges and the base of the wall matter more than usual.
Where a property in Belfast is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Postcode district
- BT1
- County or area
- County Antrim
- Nation
- Northern Ireland
- Nearby
- Castlereagh, Newtownabbey, Holywood, Lisburn
Approvals in Northern Ireland
Internal insulation rarely needs planning permission; listed buildings need consent for internal changes.
Council building control in Northern Ireland checks insulation work of this kind; the quote says how the application is handled.
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 Belfast
| 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.
What happens next
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 Belfast: questions
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.
How much room space will I lose?
Usually 50–100mm on each insulated wall, depending on the system.
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
Do you cover Belfast?
Yes — we survey and quote internal wall insulation in Belfast (BT1) and nearby Castlereagh, Newtownabbey and Holywood, with a fixed written price before any work starts.