Internal wall insulation · Gwynedd
Internal wall insulation in Bangor (Gwynedd)
We quote internal wall insulation for homes in Bangor (Gwynedd, LL57) and nearby Llangefni and Caernarfon, with guide prices online and a free survey to fix the price. Where a property in Bangor (Gwynedd) is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Free survey in LL57 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Bangor (Gwynedd)
Postcode, service and a phone number is all we need.
What the job covers
- Keeps the outside of the house exactly as it is
- Can be done one room at a time during a renovation
- Insulated plasterboard, stud wall or breathable systems
- Needs careful detailing at floor joists, reveals and corners
What we look for in Bangor (Gwynedd)
As well as Bangor (Gwynedd) itself, we quote in Llangefni, Caernarfon and Llandudno. North Wales has many solid stone and slate-built homes, Victorian seaside terraces and post-war council estates.
Parts of Gwynedd 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.
For terraced homes in Bangor (Gwynedd) with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Postcode district
- LL57
- County or area
- Gwynedd
- Nation
- Wales
- Nearby
- Llangefni, Caernarfon, Llandudno, Colwyn Bay
Approvals in Wales
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 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 Bangor (Gwynedd)
| 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 Bangor (Gwynedd): 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.
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.
Do you cover Bangor (Gwynedd)?
Yes — we survey and quote internal wall insulation in Bangor (Gwynedd, LL57) and nearby Llangefni, Caernarfon and Llandudno, with a fixed written price before any work starts.