External wall insulation in Leeds
External wall insulation (EWI) fixes insulation boards to the outside of your walls, then covers them with a reinforced base coat and a render finish.
How external wall insulation works
What it is
An EWI system is built up in layers: insulation boards fixed to the wall, a base coat with reinforcing mesh, and a decorative render finish on top. It insulates the wall from the outside, so rooms inside keep their full size.
Where it suits
It is most often considered for walls that cannot easily be insulated another way, such as solid walls. It also changes the look of the building completely, which many owners want anyway.
What to plan for
Adding thickness to a wall affects window sills, eaves, pipes and fittings, and Building Regulations may apply. We go through what applies to your property before you commit.
Manufacturers we are approved by
We are approved contractors for render systems from Ecorend, K Rend, VPI, DecoRend and Parex. Ask which system suits your property when you request a quote.
Select a manufacturer to see the systems we install.
Preparation, finishes and maintenance
Preparation
Before boards go on, we survey the walls and plan around pipes, cables, sills, eaves and anything fixed to the wall, since the wall gets thicker. A starter track sets the base line, then insulation boards are bonded and mechanically fixed.
Finishes
Over the boards goes a base coat with reinforcing mesh, then the finish. On our Roundhay project that was a white silicone render. Manufacturers also offer other finishes for their insulation systems, such as dash receivers and brick slips.
Maintenance
Treat the finish as you would a silicone or thin-coat render. Fixing anything new to an insulated wall needs fixings designed for insulation, so ask before drilling. Keep sealant around windows and pipe entries in good order.
Why people choose it
- Insulates without losing room space
- Renews the outside appearance
- Finished in a render of your choice
- Planned around sills, pipes and eaves
See the difference
From first visit to finished wall
Site visit and quote
We look at the walls, talk through the finish you want and give you a free, no-obligation quote.
Preparation
Protecting windows, doors and surrounding areas, and preparing the background for the system being applied.
Application
Base coats, reinforcement where the system needs it, and the finish coat.
Finishing and tidy-up
Detailing around windows, doors and edges to complete the finish.
External wall insulation projects
External Wall Insulation on a House in Roundhay
External Wall Insulation in Horsforth
External Wall Insulation in Chapel Allerton
Places we have carried out external wall insulation: Chapel Allerton, Horsforth, Roundhay.
Common questions
Will I lose any room inside?
No. The insulation is fixed to the outside of the wall, so internal room sizes stay the same.
Are there grants for external wall insulation?
Funding schemes change and depend on your circumstances. We do not promise grant eligibility, but we are happy to discuss the work if you are applying for one.
Does EWI need Building Regulations approval?
It can do, depending on the work. We will talk through what applies to your property during the site visit.
Other services: Silicone render · Through-coloured render · Pebble dashing · All services
What customers say
Reviews are on independent sites. Figures shown were checked on the date given and are not updated automatically.
44 reviews across platforms. Some customers may review on more than one site.
- Google13reviews · 5.0 out of 5Checked 25 October 2026Open Google profile (opens in a new tab)
- Facebook6reviewsChecked 21 October 2026Open Facebook profile (opens in a new tab)
- Trustpilot25reviewsChecked 21 October 2026Open Trustpilot profile (opens in a new tab)
We would recommend Leeds Render Systems
Leeds Render Systems recently completed rendering our existing house and the new side extension to the house. Jordan and his team were reliable and helpful, working closely with our builder to schedule the rendering work. We are very happy with the quality of work, the finished rendering, and the professional and friendly service from Leeds Render Systems. We would definitely recommend them.
Get a quote for external wall insulation
Tell us about the property and the finish you have in mind. Photos of the walls help us give you a useful first answer.