Brick Slip EWI in Caernarfon | Prices & Free Survey

What is brick slip external wall insulation?

Brick slip external wall insulation is an EWI system finished with 10–20mm thick clay brick slips, bonded with adhesive onto a reinforced basecoat over the insulation and then pointed. Corner slips return around external corners so the finish reads as solid brickwork.

Brick slip EWI 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.

We arrange surveys in Caernarfon (LL55) at a time that suits you, and cover neighbouring Bangor in Gwynedd, Holyhead and Colwyn Bay too.

Gwynedd has some of the UK's more exposed locations for wind-driven rain, which shapes the render and detailing we specify.

Brick slip EWI near Caernarfon: Bangor, Gwynedd (8 miles), Holyhead (19 miles), Colwyn Bay (25 miles).

Cost in Caernarfon

Guide prices for brick slip external wall insulation in Caernarfon run from about £185 to £265 per square metre installed, slips and pointing included; scaffolding priced per house, with VAT at 0% on homes until 31 March 2027.

What moves the price most is the board and finish you choose, the access around the house, and details such as roofline extensions or moving a gas meter.

Key facts

Finish: Real clay brick slips, 10–20mm
Bond: Stretcher, Flemish-effect or to match
Corners: L-shaped corner slips

Why choose it

Keeps a real brick appearance
Often an easier route through planning than render on brick streets
Very durable, low-maintenance face

Why is a brick slip finish more expensive?

Slips are a material cost on their own, they are laid by hand course by course, corners need special pieces, and the whole face is pointed. Expect brick slip finishes to cost noticeably more per square metre than render.

More services in Caernarfon

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.

Brick slip EWI in Caernarfon: questions

How much should I budget for brick slip external wall insulation in Caernarfon?

Budget around £185–£265 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.

Is building control approval needed for brick slip external wall insulation in Caernarfon?

Wales has its own Building Regulations and Approved Document L. Renovating a large part of an external wall brings the energy standards into play, so building control approval is needed for EWI. We arrange it as part of the job.

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.

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Brick slip external wall insulation in Caernarfon