Internal wall insulation · Mid Glamorgan
Internal wall insulation in Merthyr Tydfil
If you're planning internal wall insulation in Merthyr Tydfil, start with a free survey: we measure, check the walls and confirm planning and building control for your address. We plan internal insulation in Merthyr Tydfil homes room by room so you keep the rest of the house usable.
- Free survey in CF47 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Merthyr Tydfil
Postcode, service and a phone number is all we need.
Included as standard
- 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
- Loses roughly 50–100mm per insulated wall
Local considerations in Merthyr Tydfil
As well as Merthyr Tydfil itself, we quote in Aberdare, Rhondda and Ebbw Vale. Merthyr Tydfil sits around 7 miles from 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 Merthyr Tydfil with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Postcode district
- CF47
- County or area
- Mid Glamorgan
- Nation
- Wales
- Nearby
- Aberdare, Rhondda, Ebbw Vale, Pontypridd
Permissions 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 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 Merthyr Tydfil
| 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
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 Merthyr Tydfil: questions
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
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.
Do you cover Merthyr Tydfil?
Yes — we survey and quote internal wall insulation in Merthyr Tydfil (CF47) and nearby Aberdare, Rhondda and Ebbw Vale, with a fixed written price before any work starts.