External wall insulation in Caernarfon
We cover Caernarfon and nearby Bangor in Gwynedd for external wall insulation, with the survey, system choice, building control and finish all set out in one written quote.
Homes in and around Caernarfon
Caernarfon is in the LL55 postcode district, about 8 miles from Bangor in Gwynedd. 3 other towns we cover are within 25 miles.
From Caernarfon we also cover Bangor in Gwynedd (8 miles away), Holyhead (19 miles) and Colwyn Bay (25 miles).
Gwynedd 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: Bangor, Gwynedd (8 miles), Holyhead (19 miles), Colwyn Bay (25 miles).
External wall insulation prices in Caernarfon
Guide prices for external wall insulation in Caernarfon 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 Caernarfon
- Mineral wool EWI
- Brick slip EWI
- Insulating lime render
- Silicone render finish
- Non-traditional houses
- Bungalow EWI
- Detached house EWI
- Park home insulation
- Failed EWI remediation
- EWI surveys
- All 24 services
Rules that apply in Caernarfon
- 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 Caernarfon: questions
How much should I budget for external wall insulation in Caernarfon?
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 Caernarfon and fixes the total in writing.
Do you cover Bangor in Gwynedd as well as Caernarfon?
Yes. From Caernarfon we also cover Bangor in Gwynedd, Holyhead and Colwyn Bay, and the rest of Gwynedd.
Which EWI system suits homes in Caernarfon?
It depends on the walls. Most brick houses in Caernarfon 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.