External wall insulation in Merthyr Tydfil
External wall insulation in Merthyr Tydfil and across Mid Glamorgan, priced from a free survey and installed with photographs of every hidden detail.
Homes in and around Merthyr Tydfil
Merthyr Tydfil is in the CF47 postcode district, about 7 miles from Rhondda. 6 other towns we cover are within 25 miles.
We arrange surveys in Merthyr Tydfil (CF47) at a time that suits you, and cover neighbouring Aberdare, Rhondda and Ebbw Vale too.
Mid Glamorgan has some of the UK's more exposed locations for wind-driven rain, which shapes the render and detailing we specify.
Nearby towns we cover: Aberdare (4 miles), Rhondda (7 miles), Ebbw Vale (8 miles), Tonypandy (9 miles), Pontypridd (10 miles), Brecon (14 miles).
External wall insulation prices in Merthyr Tydfil
Guide prices for external wall insulation in Merthyr Tydfil run from about £109 to £175 per square metre installed, depending on system and finish; scaffolding priced per house, with VAT at 0% on homes until 31 March 2027.
Brick slips, cladding and mineral wool cost more than EPS and render; the survey shows you the difference side by side.
Popular services in Merthyr Tydfil
- EWI installation
- EPS insulated render
- Phenolic EWI
- Brick slip EWI
- Silicone render finish
- Bungalow EWI
- Detached house EWI
- Flats & low-rise blocks
- Social housing EWI
- EWI surveys
- All 24 services
Rules that apply in Merthyr Tydfil
- Funding
- Warm Homes Nest provides free improvements to low-income owner-occupiers and private tenants, and the Green Homes Wales pilot has offered interest-free loans to households above those thresholds. ECO4 closes on 31 December 2026. These schemes use their own approved installers; our quotes are for privately funded work unless we confirm otherwise in writing. Grants guide
- VAT
- Installing insulation in a home is zero-rated for VAT until 31 March 2027, then 5%.
Checked October 2026. Rules change, so we confirm them for your address at survey.
External wall insulation in Merthyr Tydfil: questions
How much should I budget for external wall insulation in Merthyr Tydfil?
Budget around £109–£175 per square metre of wall for the system and finish, plus scaffolding priced per house. The survey measures your walls in Merthyr Tydfil and fixes the total in writing.
Do you cover Aberdare as well as Merthyr Tydfil?
Yes. From Merthyr Tydfil we also cover Aberdare, Rhondda and Ebbw Vale, and the rest of Mid Glamorgan.
Which EWI system suits homes in Merthyr Tydfil?
It depends on the walls. Most brick houses in Merthyr Tydfil suit EPS with silicone render; older stone or lime-built walls suit wood fibre or insulating lime render; and blocks need mineral wool. The free survey recommends one and explains why.