Internal wall insulation · Gwent
Internal wall insulation in Cwmbran
Quotes for internal wall insulation in Cwmbran list the system, the detailing and the VAT position in writing, so you know exactly what's included. We plan internal insulation in Cwmbran homes room by room so you keep the rest of the house usable.
- Free survey in NP44 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Cwmbran
Postcode, service and a phone number is all we need.
What you get
- Loses roughly 50–100mm per insulated wall
- Needs careful detailing at floor joists, reveals and corners
- Sockets, radiators, skirting and coving are moved and refitted
- Keeps the outside of the house exactly as it is
What we look for in Cwmbran
Surveys in Cwmbran also cover the surrounding NP44 district and towns such as Pontypool and Risca. Cwmbran sits around 5 miles from Newport (Gwent). South Wales has long runs of solid-wall valley terraces, Victorian and Edwardian town housing and post-war council estates.
Exposure to wind-driven rain varies across Gwent: sheltered town streets fare better than walls on high ground or facing the prevailing weather, and the render, beads and cill details are chosen with that in mind.
For terraced homes in Cwmbran with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Postcode district
- NP44
- County or area
- Gwent
- Nation
- Wales
- Nearby
- Pontypool, Risca, Newport (Gwent), Caerphilly
Permissions 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 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 Cwmbran
| 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 Cwmbran: questions
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
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 Cwmbran?
Yes — we survey and quote internal wall insulation in Cwmbran (NP44) and nearby Pontypool, Risca and Newport (Gwent), with a fixed written price before any work starts.