Internal wall insulation · West Glamorgan
Internal wall insulation in Swansea
Need internal wall insulation in Swansea? Tell us about the property and we'll arrange a free survey and a written quote. For terraced homes in Swansea with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Free survey in SA1 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Swansea
Postcode, service and a phone number is all we need.
What you get
- Can be done one room at a time during a renovation
- Keeps the outside of the house exactly as it is
- Insulated plasterboard, stud wall or breathable systems
- Needs careful detailing at floor joists, reveals and corners
What we look for in Swansea
We also cover Briton Ferry and Gorseinon, close to Swansea. South Wales has long runs of solid-wall valley terraces, Victorian and Edwardian town housing and post-war council estates.
Parts of West Glamorgan 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 Swansea is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Postcode district
- SA1
- County or area
- West Glamorgan
- Nation
- Wales
- Nearby
- Briton Ferry, Gorseinon, Neath, Port Talbot
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.
Do I need Building Regulations approval?
Yes, in England and Wales once you insulate or replaster more than half of a wall's area (or more than a quarter of the building's whole envelope), it's treated as renovating a thermal element. The wall should reach about 0.30 W/m²K where practical, and building control needs to be involved.
Internal wall insulation prices in Swansea
| 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 Swansea: 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.
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 Swansea?
Yes — we survey and quote internal wall insulation in Swansea (SA1) and nearby Briton Ferry, Gorseinon and Neath, with a fixed written price before any work starts.