Internal wall insulation · Dyfed
Internal wall insulation in Carmarthen
Internal wall insulation in Carmarthen: free survey, written specification and a fixed price, with the details that keep walls dry planned from the start. For terraced homes in Carmarthen with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Free survey in SA31 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Carmarthen
Postcode, service and a phone number is all we need.
What's included
- Sockets, radiators, skirting and coving are moved and refitted
- Can be done one room at a time during a renovation
- Loses roughly 50–100mm per insulated wall
- Keeps the outside of the house exactly as it is
What we look for in Carmarthen
As well as Carmarthen itself, we quote in Llanelli, Ammanford and Gorseinon. Carmarthen sits around 14 miles from 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 Carmarthen homes room by room so you keep the rest of the house usable.
- Postcode district
- SA31
- County or area
- Dyfed
- Nation
- Wales
- Nearby
- Llanelli, Ammanford, Gorseinon, Swansea
Wales: planning and regulations
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 Carmarthen
| 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 Carmarthen: questions
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
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 Carmarthen?
Yes — we survey and quote internal wall insulation in Carmarthen (SA31) and nearby Llanelli, Ammanford and Gorseinon, with a fixed written price before any work starts.