Real thermal comfort
Warmer in winter, cooler in summer. The brick becomes part of the insulation system rather than a heat leak.
Bristol EWI
The right upgrade for solid-wall Bristol homes.
Most of Bristol’s older terraces (Victorian and Edwardian stock across St George, Easton, Bedminster, Bishopston, Redland, Clifton and beyond) have solid brick walls with no cavity to fill. That leaves internal insulation, which eats floor space, or external wall insulation, which wraps the outside of the house in a thick insulated render.
External wall insulation is the more effective choice for most people. It puts the insulation outside the brick, which means the brick itself starts working for you. Solid masonry has real thermal mass. Insulated on the outside, that mass helps stabilise the temperature inside your home rather than radiating heat out through the walls. On top of that, EWI leaves your internal floor space untouched.
The roof-side detail most EWI jobs get wrong
The eaves have to be extended. Properly.
Adding EWI thickens your walls by around 100 to 150 millimetres. The problem is that the roof was built for the original wall thickness. The eaves overhang no longer covers the new wall face. Rainwater runs straight down the wall, or worse, tracks in behind the new insulation and gets trapped between the EWI board and the brick underneath.
Trapped moisture between insulation and masonry is the failure mode that ruins EWI jobs. Once it starts, it’s slow, expensive to fix, and often invisible from the outside until damage is done. Our roofing background means we handle the eaves extension as part of the EWI job: new fascia and soffit lines, guttering repositioned, verge and ridge details reworked so water sheds off the new wall thickness. Done properly, it’s the difference between EWI that lasts and EWI that fails.
Why Bristol homes benefit.
Especially the older solid-wall stock the city is full of.
Lower energy bills
Solid-wall Bristol homes are among the leakiest in the UK. EWI can dramatically cut heating demand.
No lost internal space
Internal insulation eats floor area room by room. EWI adds thickness to the outside instead.
What we bring to an EWI job.
It's not just insulation. It's a whole system that has to be right at every layer.
- Quality insulation boards, sized correctly for your walls.
- Vetted renderers using quality base coats and top coats.
- Eaves extended and roof detailing reworked to cover the new wall thickness.
- Guttering, downpipes and window reveals detailed properly.
- One team coordinating the roof and the render side.
- Written quote covering the whole job, no separate contractors chasing.
The failure modes we design out.
Most EWI jobs that fail early do so for the same handful of reasons.
- Eaves left short, so water runs down the wall face.
- Moisture trapped between the EWI board and the brick.
- Cheap render cracking within a few winters.
- Window sills and reveals detailed badly, letting water in.
- Multiple trades not talking to each other.
- No breathability designed in for older solid-wall homes.
EWI questions, answered.
Is my Bristol home suitable for EWI?
If you have a solid-wall property (most of Bristol's Victorian and Edwardian terraces do) then yes. We'll come out for a survey, check the wall build-up, look at the roof detail, and give you a straight answer on whether EWI is the right call for your house.
Why do the roof eaves need extending?
EWI adds around 100 to 150 millimetres to the outside of your walls. The original roof was built for the original wall thickness, so the eaves no longer cover the new outer wall face. Left alone, water runs down the wall and can get trapped between the insulation and the brick. Extending the eaves is what stops that happening, and it's often what pure EWI installers skip because they aren't roofers.
Will EWI change the look of my house?
Yes, meaningfully. The finish is render, in whatever colour and texture you choose. On a Victorian terrace you might want to keep something close to the original tone. On a semi you have more freedom. We'll show you options at the quote stage. If your property is in a conservation area, planning rules may apply.
What render do you use?
We use quality silicone-based renders that shed water, resist algae, and hold their colour. On period properties we can specify lime-based systems where breathability matters. Our renderers are chosen for the quality of their work, not the price of their day rate.
How long does the job take?
A typical Bristol terrace EWI job is around three to five weeks on site once scaffolding is up. Larger detached homes take longer. Weather affects it, especially the render curing phases.
Are grants available for EWI?
There are national schemes (ECO4, the Great British Insulation Scheme) that fund EWI on eligible properties. Eligibility is mostly means-tested. Grant-funded work has to be delivered by scheme-registered installers, so the paperwork side is best handled through a specialist EWI grant provider. If you want to fund the job privately, we can quote directly.
Do you offer a guarantee?
Yes. Workmanship on our side of the job is guaranteed, and the render and insulation systems both carry manufacturer warranties, typically 25 years. We set it all out clearly in the quote.
Considering EWI on a Bristol home?
Book a survey and we'll walk your property, look at the roof detail, and tell you honestly if EWI is right for you.