Brick slip external wall insulation in Gwynedd
Brick slip external wall insulation in Gwynedd: guide prices, how the work is done, and the Wales planning and building rules, with local pages for Bangor, Gwynedd, Caernarfon and more.
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.
Homes across Gwynedd
Slate and stone houses in Eryri (Snowdonia) National Park, quarry villages, and coastal towns facing high levels of wind-driven rain.
Gwynedd has some of the UK's more exposed locations for wind-driven rain, which shapes the render and detailing we specify.
We cover 3 towns in Gwynedd for brick slip external wall insulation, listed below, and the villages around them.
Prices in Gwynedd
Guide prices for brick slip external wall insulation in Gwynedd 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.
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.
Specification
- Finish
- Real clay brick slips, 10–20mm
- Bond
- Stretcher, Flemish-effect or to match
- Corners
- L-shaped corner slips
- Insulation underneath
- EPS or mineral wool, as certified
- Weight
- Heavier than render; anchor pattern checked
- Best for
- Brick streets, planning-sensitive fronts
Why choose it
- Keeps a real brick appearance
- Often an easier route through planning than render on brick streets
- Very durable, low-maintenance face
- Can mix with render on side and rear walls to manage cost
Can brick slips match my existing bricks?
Slips come in a wide range of colours and textures, and a close match is often possible. An exact match to weathered Victorian brick is hard; we bring samples to the survey and you see them against your wall in daylight before ordering.
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.
Other services in Gwynedd
- EWI installation
- EPS insulated render
- Mineral wool EWI
- Phenolic EWI
- Wood fibre EWI
- Insulated cladding
- Insulating lime render
- Silicone render finish
- Mineral & silicate render
- Pebbledash & dry dash EWI
- Solid wall insulation
- Non-traditional houses
- Bungalow EWI
- Terraced house EWI
- Semi-detached EWI
- Detached house EWI
- Park home insulation
- Flats & low-rise blocks
- Social housing EWI
- EWI for landlords
- EWI repairs
- Failed EWI remediation
- EWI surveys
Towns in Gwynedd
The rules in Wales
- 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.
- Building regulations
- 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.
- Fire safety
- Wales has its own Approved Document B. The system's fire classification, the building's height and the distance to the boundary decide which insulation can be used; on taller residential buildings non-combustible insulation is required.
- 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.
Questions about brick slip external wall insulation
Can brick slips go on mineral wool?
Yes, where the system holder certifies the combination. Mineral wool with brick slips is used on low-rise blocks.
How long do brick slips take?
Longer than render: allow extra days per elevation for laying and pointing.
Can I do the front in slips and the rest in render?
Yes. It is a common way to keep the street face in brick and control the cost.