External Wall Insulation in Cheshire & The North West
The go-to solution for solid-wall properties — warmer home, lower bills, transformed appearance.
Trustmark-registered installers based in Nantwich. Free survey, expert advice, SWIGA-backed guarantee.
45%
Heat loss reduced through walls
1,200+
Homes insulated
25yr
Guarantee
Solid walls? No problem
EWI is the go-to insulation solution for pre-1920s homes and properties without a cavity — we handle everything from survey to finish.
SWIGA-backed Guarantee
Certified by the Solid Wall Insulation Guarantee Agency — your installation is protected for 25 years by an independent insurer.
Grants handled for you
We check your eligibility and handle all the ECO4 and GBIS paperwork on your behalf.
Is My Home Suitable?
External wall insulation is the go-to solution for homes that can’t be insulated from the inside — particularly solid-wall properties built before the 1920s, including Victorian and Edwardian terraces.
It’s also a smart choice if you’re already planning external renovation work, or if your cavity insulation isn’t an option due to wall condition or exposure.
We survey every property first, free of charge. If it’s not the right solution for your home, we’ll tell you.
Signs External Wall Insulation could be right for you:
- Your home has solid walls with no cavity
- Upstairs and downstairs rooms are consistently cold
- Your heating bills are high despite other improvements
- You want to improve your home's appearance at the same time
- You're planning external renovation or render work
How It Works
Free survey
We assess your walls, check for any damp or damage, confirm suitability and advise on the best system for your property — all before any work is agreed.
Preparation
We make sure the wall surface is clean, sound and ready. Any damaged render, pipework or wall furniture is adjusted before installation begins.
Insulation fixed to the wall
Insulation boards are mechanically fixed and/or adhesively bonded to the exterior walls, creating a continuous thermal layer with no cold bridges.
Basecoat & mesh
A basecoat is applied and reinforced with mesh for impact resistance and structural integrity.
Final render or finish
Your chosen finish is applied — smooth, textured or brick-effect — giving your home a clean, refreshed exterior.
Signed off & guaranteed
We complete a full inspection before we leave, and every installation comes with a 25-year SWIGA-backed guarantee.
-
Step 1
Free survey
We assess your walls, check for any damp or damage, confirm suitability and advise on the best system for your property — all before any work is agreed.
-
Step 2
Preparation
We make sure the wall surface is clean, sound and ready. Any damaged render, pipework or wall furniture is adjusted before installation begins.
-
Step 3
Insulation fixed to the wall
Insulation boards are mechanically fixed and/or adhesively bonded to the exterior walls, creating a continuous thermal layer with no cold bridges.
-
Step 4
Basecoat & mesh
A basecoat is applied and reinforced with mesh for impact resistance and structural integrity.
-
Step 5
Final render or finish
Your chosen finish is applied — smooth, textured or brick-effect — giving your home a clean, refreshed exterior.
-
Step 6
Signed off & guaranteed
We complete a full inspection before we leave, and every installation comes with a 25-year SWIGA-backed guarantee.
What we offer
EPS (expanded polystyrene) systems
The most widely used EWI system — cost-effective, thermally efficient and available in a wide range of finishes.
Mineral wool systems
Ideal for properties requiring improved fire performance or breathability, particularly older or solid-wall homes.
Brick-slip & decorative finishes
Maintain the character of your property with a brick-slip or textured finish that looks the part as well as performing.
Combined render & insulation
Planning a full exterior refresh? We can combine EWI with new render for a complete transformation in a single project.
Why choose Insul8?
External wall insulation is a significant project. The quality of the installer matters as much as the system — and we’ve built our reputation on getting it right.
- Trustmark-registered & CHAS accredited — independently vetted with consumer protection
- SWIGA approved — Solid Wall Insulation Guarantee Agency certified installations
- PAS 2035 registered — the retrofit industry’s gold standard
- EWIPRO certified — specialist accreditation for external wall insulation
- Free, honest survey — we assess before we recommend, every time
- Grants handled for you — ECO4 and GBIS eligibility checked and paperwork managed
- Nantwich-based, local team — covering Cheshire, Greater Manchester, Shropshire and Staffordshire
Why It’s Worth It
- Lower energy bills — significantly reduce the amount of energy needed to heat your home
- Warmer, more comfortable rooms — no more cold walls or persistent draughts
- Transformed appearance — a fresh, clean exterior finish that adds kerb appeal
- Better EPC rating — good for property value and landlord energy efficiency compliance
- Reduced condensation — warmer wall surfaces mean less moisture build-up inside
- Lower carbon footprint — less energy used means fewer emissions
- Long-lasting — external wall insulation is designed to last decades with minimal maintenance
- Trustmark
- CHAS
- PAS 2035
- SWIGA
- EWIPRO
- TrustATrader
- 25-Year Guarantee
Your questions, answered
It’s most commonly used for solid-wall properties without a cavity — typically homes built before the 1920s. It can also be used on cavity-wall homes where the cavity isn’t suitable for filling. Our survey confirms suitability before any work is quoted.
Yes — external wall insulation requires scaffolding for safe access. We manage this as part of the project.
Not if installed correctly. A properly fitted EWI system is weather-resistant and actually helps prevent moisture getting into the wall structure. Our survey checks for any existing damp issues that need resolving first.
Every EWI installation comes with a 25-year SWIGA-backed guarantee — independent, insurance-backed and fully transferable if you sell the property.
Yes — but in a good way. You choose the finish, from smooth render to textured or brick-slip effects. Most customers are delighted with how their property looks afterwards.
Timescales depend on property size and complexity. A typical semi-detached takes around 5–10 days. We’ll give you a clear programme before work starts.
Yes — we check your eligibility for ECO4 and GBIS funding and manage all the paperwork on your behalf.
Nantwich-based, covering Cheshire, Greater Manchester, Shropshire and Staffordshire. Get in touch to check your area.
Speak to the experts of external wall insulation
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Contact details
Serving Cheshire & The North West · Mon–Fri, 8am–6pm