Internal wall insulation · County Down
Internal wall insulation in Castlereagh
Looking for internal wall insulation in Castlereagh? We survey homes across Castlereagh and the BT5 area, then give you a fixed written price before any work starts. Where a property in Castlereagh is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Free survey in BT5 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Castlereagh
Postcode, service and a phone number is all we need.
What you get
- Can be done one room at a time during a renovation
- Sockets, radiators, skirting and coving are moved and refitted
- Needs careful detailing at floor joists, reveals and corners
- Loses roughly 50–100mm per insulated wall
Before we quote in Castlereagh
As well as Castlereagh itself, we quote in Belfast, Holywood and Newtownabbey. Castlereagh is about 11 miles from Bangor (County Down). Northern Ireland has many rendered and pebble-dashed homes, older solid-walled rural houses, and estates built by the Housing Executive.
Exposure to wind-driven rain varies across County Down: sheltered town streets fare better than walls on high ground or facing the prevailing weather, and the render, beads and cill details are chosen with that in mind.
We plan internal insulation in Castlereagh homes room by room so you keep the rest of the house usable.
- Postcode district
- BT5
- County or area
- County Down
- Nation
- Northern Ireland
- Nearby
- Belfast, Holywood, Newtownabbey, Lisburn
Planning and building control 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 options for internal insulation?
- Insulated plasterboard — PIR or phenolic foam bonded to plasterboard, fixed to the wall and skimmed. Thinnest option.
- Insulated stud wall — a timber or metal frame filled with insulation, with a vapour control layer and plasterboard. Takes more space but runs services easily.
- Wood fibre and lime — breathable boards finished in lime plaster, for older walls that need to manage moisture.
Internal wall insulation prices in Castlereagh
| 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
Get a guide price
Try the online quote tool for a ballpark figure.
Book the survey
A visit at a time that suits you.
Agree the quote
Nothing starts until you've signed the written price.
We do the work
Planned around weather, with you kept informed.
Internal wall insulation in Castlereagh: questions
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.
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 Castlereagh?
Yes — we survey and quote internal wall insulation in Castlereagh (BT5) and nearby Belfast, Holywood and Newtownabbey, with a fixed written price before any work starts.