External wall insulation in Carmarthen
Every external wall insulation job in Carmarthen starts with a free survey of your walls: what they are built from, how they have weathered, and what the details around windows, eaves and services will need.
Homes in and around Carmarthen
Carmarthen is in the SA31 postcode district, about 13 miles from Llanelli. 4 other towns we cover are within 25 miles.
Our Carmarthen surveys cover the SA31 district and the surrounding area, including Llanelli, Ammanford and Gorseinon.
Parts of Dyfed see high levels of wind-driven rain, so render specification and the details at sills and the roofline get extra attention.
Nearby towns we cover: Llanelli (13 miles), Ammanford (14 miles), Gorseinon (17 miles), Swansea (22 miles).
External wall insulation prices in Carmarthen
Guide prices for external wall insulation in Carmarthen 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.
The final figure depends on wall area, the number of windows and doors, the finish and how much work the roofline, sills and services need.
Popular services in Carmarthen
- Mineral wool EWI
- Insulated cladding
- Solid wall insulation
- Non-traditional houses
- Terraced house EWI
- Detached house EWI
- Park home insulation
- Flats & low-rise blocks
- Social housing EWI
- Failed EWI remediation
- All 24 services
Rules that apply in Carmarthen
- Planning
- Welsh guidance allows cladding a house without an application if the materials look similar to the original, but external wall insulation that projects more than 16cm from the wall needs planning permission. Any cladding or render in a conservation area, National Park, AONB or World Heritage Site needs permission, listed buildings need consent, and permitted development rights may have been removed by condition or Article 4 direction.
- 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 Carmarthen: questions
How much should I budget for external wall insulation in Carmarthen?
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 Carmarthen and fixes the total in writing.
Is VAT charged on external wall insulation in Carmarthen?
Not on installing insulation in a home at the moment: that's zero-rated until 31 March 2027, after which the rate is due to be 5%. Work on commercial buildings is standard-rated.
Do you cover Llanelli as well as Carmarthen?
Yes. From Carmarthen we also cover Llanelli, Ammanford and Gorseinon, and the rest of Dyfed.