Improved Thermal Performance
Reduces heat loss through solid walls, which can meaningfully cut heating costs.
Insulate & transform
External Wall Insulation Specialists in Bedford
External Wall Insulation Specialists in Bedford
& Surrounding Areas
Insulation boards fixed to the outside of your property, finished with a reinforced, through-coloured render — improving thermal performance and giving your home a fresh exterior at the same time.
Trusted by
Homeowners Across
Bedford & BeyondEWI Specialists
Homeowners Across
Bedford & BeyondEWI Specialists
Why Choose External Wall Insulation?
Improve thermal performance and refresh your exterior in one project.
Reduces Cold Bridging
A well-installed system helps create a warmer, more even internal temperature.
A Fresh Exterior
The render finish goes on over the insulation, so you get a new look alongside the thermal upgrade.
No Loss of Space
Unlike internal insulation, EWI doesn’t eat into your room sizes.
How External Wall Insulation Works
An EWI system combines an insulation layer with a reinforced, through-coloured render finish.
- Insulation boards: EPS or mineral wool boards are mechanically fixed and/or bonded to the existing wall.
- Reinforced basecoat: A basecoat with embedded mesh is applied over the boards for strength.
- Render finish: A through-coloured finish — often silicone — is applied on top.
Key Benefits of External Wall Insulation
Thermal upgrade
Reduces heat loss through the walls, particularly on older solid-wall properties.
Helps with damp & cold spots
A well-installed system reduces cold bridging.
Fresh exterior
A new render finish alongside the thermal upgrade.
No internal disruption
Doesn’t reduce room sizes the way internal insulation can.
External wall insulation explained
What is External Wall Insulation?
External wall insulation (EWI) combines an insulation layer, fixed to the outside of the property, with a reinforced, through-coloured render finish — improving thermal performance and refreshing the exterior at the same time.
Board thickness and material (commonly EPS or mineral wool) are chosen based on the thermal improvement you’re after and the wall’s existing performance.
Compare the options
EWI vs Standard Render
Both give your walls a fresh exterior finish, but only one adds insulation.
External wall insulation
Insulated & thermally upgraded
- Adds an insulation layer under the render
- Reduces heat loss and cold bridging
- Particularly suited to solid-wall properties
- A fresh exterior alongside the thermal upgrade
Standard render
Finish only, no insulation
- Reinforced basecoat and coloured finish coat
- No change to the wall’s thermal performance
- Typically a lower-cost, quicker project
- Suits properties with adequate existing insulation
Which is better? EWI is worth considering on solid-wall properties with poor existing insulation. Where insulation isn’t a priority, a standard render system may be all you need.
From start to finish
See how we work
Our EWI Installation Process
A proven process for a warmer, better-finished home.
01
Survey
We assess your walls, existing insulation and the thermal improvement you’re after.
02
Fixing Boards
Insulation boards are mechanically fixed and/or bonded to the wall.
03
Basecoat & Mesh
A reinforced basecoat locks the boards in place and adds strength.
04
Render Finish
A through-coloured finish coat is applied and textured.
Proof in the finish
View all work Recent Rendering Projects
Is External Wall Insulation Right for Your Property?
External wall insulation is particularly well suited to solid-wall properties — common in homes built before the 1930s cavity-wall era — with poor existing insulation, though it can also suit cavity-wall properties.
Board thickness is chosen based on the thermal improvement you’re after. If you’re weighing up the cost against the benefit, see our guide: is external wall insulation worth it?
- Improves thermal performance
- Helps reduce cold bridging
- A fresh exterior finish included
- No loss of internal room space
- Suited to solid-wall and cavity-wall properties
Common questions
View all FAQs
External Wall Insulation FAQs
Is my property suitable for external wall insulation?
EWI particularly suits solid-wall properties (common in homes built before the 1930s cavity-wall era) with poor existing insulation, though it can also suit cavity-wall properties. We assess your walls as part of a free quote.
What’s the difference between EPS and mineral wool insulation boards?
EPS tends to offer slightly better thermal performance for a given thickness and is widely used on domestic projects. Mineral wool is non-combustible and offers better breathability and sound insulation, and is often specified where fire performance is a priority.
Will external wall insulation reduce my room sizes?
No — because the insulation goes on the outside of the wall, EWI doesn’t eat into your internal room sizes the way internal insulation can.
How much does external wall insulation cost?
Cost depends on the wall area, board thickness and thermal improvement you’re after, access, and the render finish chosen. We provide a free quotation after assessing the property.
Is external wall insulation worth it?
It depends on your property’s current insulation and how long you plan to stay. See our full guide for a balanced look at the costs and benefits.
Free quotation
Get an External Wall Insulation Quote
Tell us about your property and we will assess whether EWI is the right fit and provide a clear, no-obligation quotation.
- 1Your postcode and property type
- 2A few photos of the exterior
- 3The finish or colour you are considering
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Free Quote