Mineral wool EWI · Powys
Mineral wool external wall insulation in Brecon
Looking for mineral wool external wall insulation in Brecon? We survey homes across Brecon and the LD3 area, then give you a fixed written price before any work starts. Older solid-walled homes in Brecon can suit a vapour-open mineral wool build-up better than foam; the survey checks the wall first.
- Free survey in LD3 and nearby
- Guide price from £125 per m² + scaffold, 0% VAT
- Fixed written price before work starts
Free survey in Brecon
Postcode, service and a phone number is all we need.
What's included
- Non-combustible board (typically Euroclass A1 or A2-s1,d0 as part of the system)
- Vapour-open, so moisture in solid walls can dry outwards
- Used on blocks of flats and buildings with storeys above 11m
- Better sound reduction than foam boards
Homes and walls in Brecon
We also cover Merthyr Tydfil and Ebbw Vale, close to Brecon. It's roughly 39 miles from Brecon to Newtown, the largest town in Powys. 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 homes in Brecon near busy roads, mineral wool's sound reduction can be a reason to choose it.
- Postcode district
- LD3
- County or area
- Powys
- Nation
- Wales
- Nearby
- Merthyr Tydfil, Ebbw Vale, Aberdare, Abergavenny
Approvals in Wales
Householder rules in Wales are similar to England's: in Brecon, a similar-looking finish on a house is often permitted, but conservation areas, flats and listed buildings need permission or consent.
Welsh Building Regulations expect walls to be upgraded when a substantial area is renewed, and building control signs the work off.
Wales applies its own external wall fire rules, updated in 2025; on taller residential buildings we specify non-combustible mineral wool systems.
What about noise?
Dense mineral wool adds mass and absorbs sound, so homes beside main roads or railways often notice a quieter interior, particularly where windows are also upgraded. The improvement depends on the whole wall and windows, so we don't quote decibel figures without testing.
Mineral wool external wall insulation prices in Brecon
| Item | Guide price | Notes |
|---|---|---|
| Mineral wool + mineral or silicone render | £125–£170 per m²0% VAT | Excluding scaffold |
| Mineral wool + brick slip | £195–£260 per m²0% VAT | Heavier slip systems need extra fixings |
| Three-bed semi, full house | £11,800–£20,2000% VAT | 80–100 m² of wall, including scaffold |
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.
Mineral wool EWI in Brecon: questions
Is mineral wool better than EPS?
Not always better — different. Mineral wool wins on fire performance, breathability and acoustics; EPS wins on cost, weight and thinner boards for the same U-value. The wall, the building height and your priorities decide it.
Is mineral wool needed for a bungalow?
Rarely for fire reasons. It may still be chosen on a damp-prone solid wall where a vapour-open build-up is wanted.
Can mineral wool EWI have a brick finish?
Yes. Brick slips can be bonded over mineral wool systems designed for them, with additional fixings for the extra weight.
Do you cover Brecon?
Yes — we survey and quote mineral wool external wall insulation in Brecon (LD3) and nearby Merthyr Tydfil, Ebbw Vale and Aberdare, with a fixed written price before any work starts.