External Wall Insulation (EWI) is two jobs in one — a thick insulation layer fixed to your outside walls, finished with a through-coloured render. For solid-wall properties in Preston, it's the single biggest upgrade you can make.
Why EWI in Preston?
No loss of internal floor space, unlike internal wall insulation.
Local context: Preston, Lancashire
Solid Lancashire brick terraces and 1930s pebbledash semis dominate; significant new-build belts north of the city use modern thin-coat systems. West-Lancashire rainfall is among the highest in England — water-repellence is non-negotiable. We cover the full Lancashire area from PR1 outwards, including Fulwood, Penwortham, Ashton, Ribbleton, Lea and the wider postcodes (PR1, PR2, PR3, PR4, PR5). Most Preston jobs are surveyed within 48 hours — we know the streets, parking constraints around landmarks like Preston Bus Station, and the typical substrates we'll find on the wall.
Benefits
- Eliminates cold bridging and most internal condensation.
- Brand-new render façade included.
- Significant EPC uplift.
- Improves acoustic performance.
- No loss of internal floor space.
- Refurbishes tired solid-wall properties to modern standards.
Local considerations
- Reveals, sills and drip beads are where EWI fails. We detail these properly; many cheap installers don't.
- Plan for moved rainwater goods, soil stacks and meter boxes — the project is more than just 'boards and render'.
- EWI on a damp wall just traps the damp. Cure the damp problem first.
- EWI changes the external footprint of the building by 100–200mm — windows, sills, rainwater goods and roof overhang all need designing in.
- Get the breathability right — for older solid-wall properties in Preston, mineral wool with a silicone topcoat is usually safer than EPS.
Our process in Preston
- Survey + thermal performance calc.
- Scaffold + access design (especially important on tight {town} streets).
- Substrate prep — make good, reposition rainwater goods.
- Fix EWI boards; cut around openings; detail reveals.
- Mesh-reinforced base coat.
- Through-coloured silicone TC topcoat.
- Final inspection + handover paperwork.
Areas we cover from Preston
We work across Preston (PR1, PR2, PR3, PR4, PR5) and the surrounding areas:
Frequently asked questions
What thickness of insulation do you use?
Most Preston projects sit between 90mm and 150mm, depending on the U-value target and existing detailing. We size it on survey.
Does EWI need planning permission in Preston?
Usually no for like-for-like exteriors on standard housing, but conservation areas and listed properties need checking. We'll advise on survey.
Can EWI fix damp?
EWI eliminates cold-bridging condensation — the most common cause of 'damp' patches on solid walls. It doesn't fix rising or penetrating damp, which need addressing separately.
What's the typical job duration?
Most semis in Preston: 2–3 weeks on site including scaffold. Larger detached: 3–5 weeks.
Do you cover Fulwood, Penwortham, Ashton, Ribbleton?
Yes — we install EWI across Preston and the surrounding areas.
Will EWI affect my windows?
Window reveals will need re-detailing. We design new reveal beads and trims into the quote — it's not a hidden extra.
Talk to a real renderer today. We'll measure up, walk your property, and price the job honestly.
We design EWI from the substrate up — board type, fixings, mesh, beads, finish — to match your specific Preston property. No off-the-shelf specs.