Internal wall insulation · Dyfed
Internal wall insulation in Llanelli
We quote internal wall insulation for homes in Llanelli (SA15) and nearby Gorseinon and Swansea, with guide prices online and a free survey to fix the price. Where a property in Llanelli is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Free survey in SA15 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Llanelli
Postcode, service and a phone number is all we need.
What you get
- 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
- Insulated plasterboard, stud wall or breathable systems
Local considerations in Llanelli
We also cover Gorseinon and Swansea, close to Llanelli. West Wales has a high share of older solid-walled and stone homes, many in exposed coastal or rural settings.
Parts of Dyfed 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.
We plan internal insulation in Llanelli homes room by room so you keep the rest of the house usable.
- Postcode district
- SA15
- County or area
- Dyfed
- Nation
- Wales
- Nearby
- Gorseinon, Swansea, Ammanford, Carmarthen
Planning and building control 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 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 Llanelli
| 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
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 Llanelli: 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 Llanelli?
Yes — we survey and quote internal wall insulation in Llanelli (SA15) and nearby Gorseinon, Swansea and Ammanford, with a fixed written price before any work starts.