External wall insulation in Penarth
Every external wall insulation job in Penarth 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 Penarth
Penarth is in the CF64 postcode district, about 3 miles from Cardiff. 6 other towns we cover are within 25 miles.
Our Penarth surveys cover the CF64 district and the surrounding area, including Cardiff, Barry and Caerphilly.
Most EWI failures start at the edges rather than the middle of a wall, so the quote for your Penarth home sets out how each detail will be built.
Nearby towns we cover: Cardiff (3 miles), Barry (5 miles), Caerphilly (10 miles), Risca (12 miles), Newport, Gwent (13 miles), Pontypridd (13 miles).
External wall insulation prices in Penarth
Guide prices for external wall insulation in Penarth 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.
Whole-house prices include standard scaffolding, beads, sills and refitting services; unusual access, footpath licences and wall repairs are quoted separately.
Popular services in Penarth
- Wood fibre EWI
- Insulated cladding
- Insulating lime render
- Mineral & silicate render
- Non-traditional houses
- Bungalow EWI
- Detached house EWI
- Flats & low-rise blocks
- Failed EWI remediation
- EWI surveys
- All 24 services
Rules that apply in Penarth
- 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 Penarth: questions
How much should I budget for external wall insulation in Penarth?
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 Penarth and fixes the total in writing.
Do you cover Cardiff as well as Penarth?
Yes. From Penarth we also cover Cardiff, Barry and Caerphilly, and the rest of South Glamorgan.
Which EWI system suits homes in Penarth?
It depends on the walls. Most brick houses in Penarth 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.