Warmer rooms, lower bills — insulation that works from the outside in.
If your home was built before the 1920s it probably has solid walls, and up to a third of its heat escapes straight through them. External wall insulation wraps your home in an insulating layer and a fresh weatherproof finish — no internal disruption, no lost floor space. We’re a PAS 2030 and TrustMark-registered installer.
MCS Cert No. 270527
PAS 2030 & 2035 standard
TrustMark registered
of your home’s heat is lost through uninsulated solid walls
What is external wall insulation?
External wall insulation (EWI) is an insulating board fixed to the outside of your walls, then covered with a tough, breathable render or cladding. It’s the standard solution for solid-wall homes — properties with no cavity to fill — and it’s fitted entirely from outside, so your rooms stay exactly as they are while the work happens. Done properly to PAS 2030, it cuts heat loss, stops draughts and damp, and gives your home a clean new exterior in one job.
Comfort, lower bills, a better-looking home.
Up to a third less heat loss
Solid walls leak more heat than any other part of an uninsulated home. EWI tackles the biggest single source.
No internal disruption
Fitted from outside. No ripping out skirting, no lost room space, no redecorating inside.
A warmer, drier home
Fewer cold spots and less surface condensation, so rooms feel comfortable sooner and stay that way.
A fresh exterior
A clean, modern render finish that weatherproofs and lifts the look of the whole property.
A stronger EPC
Solid-wall insulation is one of the highest-impact measures for moving your energy rating up.
You could qualify for free or funded upgrades.
The Warm Homes: Local Grant, Boiler Upgrade Scheme and ECO4 can cover some — or all — of the cost of your home energy improvements. We handle every step of the funding application on your behalf.
£12M+ in government funding we’ve helped secure for our customers to date.
- We assess your eligibility free of charge
- We complete every funding application
- We deliver the install end-to-end
You could pay little or nothing for it.
External wall insulation is covered by the Warm Homes: Local Grant and ECO4 for eligible households. We check your eligibility free and handle the whole application.
From survey to finished render.
Free survey & design
We assess wall construction, check for damp and detailing, and design the system to PAS 2035.
Funding sorted
If you’re eligible, we handle the grant application end-to-end.
Installation
Boards fixed, reinforced, and finished with weatherproof render — clean, scaffolded, tidy.
Sign-off & lodgement
TrustMark-lodged with full documentation and guarantees.
Installed to standard, guaranteed.
Bad external wall insulation causes more problems than it solves — that’s why it’s tightly regulated. Every install we do is designed and fitted to PAS 2030 and PAS 2035, lodged with TrustMark, and backed by a system guarantee. You get the paperwork, the warranty, and a home that performs the way it should.
Trusted by homeowners.
“Our Victorian semi was always cold and the bills were brutal. The external insulation made an immediate difference — the front rooms hold their heat now and the new render looks fantastic. The team handled the grant paperwork too, which took all the stress out of it.”
Homeowner, solid-wall retrofit — Nottinghamshire
FAQ
Common questions, straight answers.
Will it change how my house looks?
Yes — for the better. EWI is finished in a render or cladding of your choice, giving a clean, uniform exterior. We agree the finish with you before we start.
Do I need planning permission?
Usually not for a standard home, but it can apply to listed buildings or conservation areas. We check this as part of the survey.
How long does it take?
Most homes are a few days to around two weeks depending on size and finish — we give you a clear timeline up front.
Will it cause damp?
Done correctly, the opposite — a properly designed, breathable system reduces condensation. Poor design causes damp, which is why we install strictly to PAS 2035.
Can I get it funded?
Possibly fully. Eligibility depends on your household and property — we check it free before you commit to anything.
Ready to reduce your energy bills?
Get a free, no-obligation property assessment. We’ll tell you exactly which upgrades suit your home — and which grants you qualify for.