Internal wall insulation · Powys
Internal wall insulation in Brecon
If you're planning internal wall insulation in Brecon, start with a free survey: we measure, check the walls and confirm planning and building control for your address. We plan internal insulation in Brecon homes room by room so you keep the rest of the house usable.
- Free survey in LD3 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Brecon
Postcode, service and a phone number is all we need.
Included as standard
- Keeps the outside of the house exactly as it is
- Needs careful detailing at floor joists, reveals and corners
- Sockets, radiators, skirting and coving are moved and refitted
- Insulated plasterboard, stud wall or breathable systems
What we look for in Brecon
As well as Brecon itself, we quote in Merthyr Tydfil, Ebbw Vale and Aberdare. Brecon sits around 39 miles from Newtown. Mid Wales is largely rural, with stone farmhouses, cottages and market-town terraces, many of them solid-walled.
Parts of Powys 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 Brecon with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Postcode district
- LD3
- County or area
- Powys
- Nation
- Wales
- Nearby
- Merthyr Tydfil, Ebbw Vale, Aberdare, Abergavenny
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.
Do I need Building Regulations approval?
Yes, in England and Wales once you insulate or replaster more than half of a wall's area (or more than a quarter of the building's whole envelope), it's treated as renovating a thermal element. The wall should reach about 0.30 W/m²K where practical, and building control needs to be involved.
Internal wall insulation prices in Brecon
| 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 Brecon: 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 Brecon?
Yes — we survey and quote internal wall insulation in Brecon (LD3) and nearby Merthyr Tydfil, Ebbw Vale and Aberdare, with a fixed written price before any work starts.