Solid Wall Insulation for Cardiff Homes
Terraces through Cathays, Roath, Canton, Grangetown and Splott were mostly built before the 1920s, which means solid walls rather than cavities. There's nothing inside those walls to fill, so the only way to insulate them is from the inside or the outside. External wall insulation does it from the outside, which keeps every inch of floor space and lets you stay in the house while the work happens.
What the survey checks
We look at how the walls are built and what condition they're in before quoting anything: whether there's existing render that has blown, whether damp is getting in from somewhere else, and how the property sits against its neighbours. On a terrace, the detailing where your wall meets the next one matters as much as the insulation itself.
Weather on this side of the country
South Wales takes more driving rain than most of England, and that shows on exposed elevations. The render system does two jobs here: it holds the insulation and it keeps the weather off the brickwork underneath. We pick the finish for the wall and the elevation rather than fitting the same spec to every house.
Planning and permissions in Wales
External wall insulation changes how a property looks, so permission depends on the elevation and the property itself. Front elevations, conservation areas and listed buildings usually need consent, and Welsh planning rules aren't identical to England's. We confirm what applies to your Cardiff address before any work is agreed.
Often done alongside external wall insulation in Cardiff
- Loft Insulation in Cardiff — the cheapest measure to pair with wall insulation
- Air Source Heat Pumps in Cardiff — a warmer fabric means a smaller, cheaper heat pump
- Full Home Renovation in Cardiff — when the outside and the inside are both due work
Beyond Cardiff, the same in-house team carries out external wall insulation in Newport, Bridgend, Neath and Merthyr Tydfil. For how we approach the work anywhere, see our External Wall Insulation & Rendering page.
