External wall insulation in Caerphilly
Homeowners in Caerphilly look at external wall insulation for warmer rooms, lower heat loss and a new exterior in one job. Here is how it works, what it costs and which Wales rules apply.
Homes in and around Caerphilly
Caerphilly is in the CF83 postcode district, about 11 miles from Rhondda. 6 other towns we cover are within 25 miles.
Our Caerphilly surveys cover the CF83 district and the surrounding area, including Risca, Pontypridd and Cardiff.
Parts of Mid Glamorgan 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: Risca (6 miles), Pontypridd (6 miles), Cardiff (7 miles), Newport, Gwent (9 miles), Penarth (10 miles), Cwmbran (10 miles).
External wall insulation prices in Caerphilly
Guide prices for external wall insulation in Caerphilly 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 Caerphilly
- Mineral wool EWI
- Wood fibre EWI
- Brick slip EWI
- Silicone render finish
- Mineral & silicate render
- Non-traditional houses
- Semi-detached EWI
- Flats & low-rise blocks
- Social housing EWI
- EWI surveys
- All 24 services
Rules that apply in Caerphilly
- 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 Caerphilly: questions
How much should I budget for external wall insulation in Caerphilly?
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 Caerphilly and fixes the total in writing.
Is VAT charged on external wall insulation in Caerphilly?
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 Risca as well as Caerphilly?
Yes. From Caerphilly we also cover Risca, Pontypridd and Cardiff, and the rest of Mid Glamorgan.