External Wall Insulation (EWI) is two jobs in one — a thick insulation layer fixed to your outside walls, finished with a through-coloured render. For solid-wall properties in York, it's the single biggest upgrade you can make.
Why EWI in York?
No loss of internal floor space, unlike internal wall insulation.
Local context: York, North Yorkshire
A protected historic core with strict conservation controls, surrounded by Victorian and 1930s suburban housing where careful lime-based work is often required. Low-lying river plain with frequent fog and damp; lime renders and breathable silicone are best matched to older walls. We cover the full North Yorkshire area from YO1 outwards, including Acomb, Clifton, Heworth, Fulford, Dringhouses and the wider postcodes (YO1, YO10, YO23, YO24, YO26, YO30, YO31). Most York jobs are surveyed within 48 hours — we know the streets, parking constraints around landmarks like York Minster, and the typical substrates we'll find on the wall.
Benefits
- No loss of internal floor space.
- Refurbishes tired solid-wall properties to modern standards.
- Long-life system when detailed properly.
- Major reduction in heating bills.
- Eliminates cold bridging and most internal condensation.
- Brand-new render façade included.
Local considerations
- Reveals, sills and drip beads are where EWI fails. We detail these properly; many cheap installers don't.
- Plan for moved rainwater goods, soil stacks and meter boxes — the project is more than just 'boards and render'.
- EWI on a damp wall just traps the damp. Cure the damp problem first.
- EWI changes the external footprint of the building by 100–200mm — windows, sills, rainwater goods and roof overhang all need designing in.
- Get the breathability right — for older solid-wall properties in York, mineral wool with a silicone topcoat is usually safer than EPS.
Our process in York
- Survey + thermal performance calc.
- Scaffold + access design (especially important on tight {town} streets).
- Substrate prep — make good, reposition rainwater goods.
- Fix EWI boards; cut around openings; detail reveals.
- Mesh-reinforced base coat.
- Through-coloured silicone TC topcoat.
- Final inspection + handover paperwork.
Areas we cover from York
We work across York (YO1, YO10, YO23, YO24, YO26, YO30, YO31) and the surrounding areas:
Frequently asked questions
Do you cover Acomb, Clifton, Heworth, Fulford?
Yes — we install EWI across York and the surrounding areas.
Will EWI affect my windows?
Window reveals will need re-detailing. We design new reveal beads and trims into the quote — it's not a hidden extra.
Are there grants available?
Grant schemes change. Ask on enquiry — if there's an active scheme that fits your York property, we'll point you to it.
How much can EWI save on bills in York?
Typically 25–35% off heating demand for solid-wall properties. The exact figure depends on current insulation, heating system, and how the house is used.
What thickness of insulation do you use?
Most York projects sit between 90mm and 150mm, depending on the U-value target and existing detailing. We size it on survey.
Does EWI need planning permission in York?
Usually no for like-for-like exteriors on standard housing, but conservation areas and listed properties need checking. We'll advise on survey.
Book a free on-site survey. We'll inspect the substrate, identify failures and recommend the right system.
We design EWI from the substrate up — board type, fixings, mesh, beads, finish — to match your specific York property. No off-the-shelf specs.