Internal wall insulation · Mid Glamorgan
Internal wall insulation in Rhondda
From Rhondda to Aberdare, we price internal wall insulation after a measured survey — no guesswork, and no work starts until the price is agreed in writing. We plan internal insulation in Rhondda homes room by room so you keep the rest of the house usable.
- Free survey in CF42 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Rhondda
Postcode, service and a phone number is all we need.
What's included
- Loses roughly 50–100mm per insulated wall
- 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
What we look for in Rhondda
We also cover Aberdare and Pontypridd, close to Rhondda. South Wales has long runs of solid-wall valley terraces, Victorian and Edwardian town housing and post-war council estates.
Parts of Mid 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.
For terraced homes in Rhondda with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Postcode district
- CF42
- County or area
- Mid Glamorgan
- Nation
- Wales
- Nearby
- Aberdare, Pontypridd, Merthyr Tydfil, Maesteg
Approvals in Wales
Internal insulation rarely needs planning permission, but in England and Wales insulating or replastering more than half of a wall's area involves building control, and listed buildings need consent for internal changes that affect their character.
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 Rhondda
| 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 Rhondda: questions
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.
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.
Do you cover Rhondda?
Yes — we survey and quote internal wall insulation in Rhondda (CF42) and nearby Aberdare, Pontypridd and Merthyr Tydfil, with a fixed written price before any work starts.