External Wall Insulation in
Bath

A typical Bristol semi with EWI will see a 25-35% reduction in heating bills — typically £400-£600/year saving. The exact saving depends on your current heating system, insulation thickness installed, and how you use the heating. We provide an estimated annual saving in every quote based on your specific property.

A typical 3-bed semi takes 8-12 working days from scaffold-up to scaffold-down. Larger detached homes can take 12-18 days. We give you a clear timeline in the quote and stick to it.

For most Bristol properties, 90-120mm of insulation is sufficient to meet Building Regulations and achieve significant energy savings. For older solid-wall properties with very poor thermal performance, 150mm may be recommended. We calculate the right thickness during the survey based on your walls, existing insulation and target U-value.

Yes — EWI typically pays for itself in 8-12 years through energy savings. After that, you're saving money every year for the 25+ year life of the system. EWI also adds measurable value to your property (estate agents report 3-7% uplift) and may qualify for funding under the ECO4 or GBIS schemes.

Generally no — EWI on a residential property is permitted development. Exceptions include: listed buildings (Listed Building Consent required), properties in conservation areas (may require consent), and properties where the EWI would significantly alter the appearance (rare in residential). Building Control notification is required for all EWI work — we handle this on your behalf.

Possibly. Under the ECO4 scheme (running until March 2026), low-income and vulnerable households can get EWI fully funded. Under the Great British Insulation Scheme (GBIS), homes in the lower EPC bands (D, E, F, G) can get subsidised EWI. We can check your eligibility and help with the application.

10-year manufacturer system warranty on all EWI installations, plus our own 10-year workmanship warranty. For qualifying installations we can offer an insurance-backed 25-year warranty through the Weber Kitemark scheme. £10m public liability insurance as standard. Free 12-month aftercare inspection.

Generally yes, with the right system. For listed properties we use thinner insulation (40-60mm) with sympathetic lime-compatible render finishes, and we work with conservation officers to ensure Listed Building Consent is properly obtained. We can advise on the right system for your specific listed property during the site visit.

EWI extends the external wall surface outwards by the insulation thickness. This means window reveals are deeper and window sills may need extending. We handle all of this as part of the installation — typically extending sills with matching UPVC or aluminium, and ensuring reveals are properly insulated to eliminate cold bridges.

Yes — EWI eliminates condensation on inside walls by warming the wall surface above the dew point. Black mould issues resolve permanently because the cold spots that caused them are removed. If you have existing mould damage internally we can also arrange for replastering and redecoration once the EWI is in place.

Almost any solid-wall property — 1930s semis, Victorian terraces, post-war detached homes, modern infill — is suitable for EWI. The main exceptions are buildings with significant structural movement, properties with extensive timber cladding or other non-masonry substrates, and listed buildings where the appearance would be significantly altered. We can advise on your specific property during the site visit.

Yes — estate agents consistently report a 3-7% uplift on properties with EWI installed versus comparable un-insulated properties. On a £350,000 Bristol home that's £10,500-£24,500 of value uplift, plus the annual energy savings. EWI also makes properties much easier to sell in the current EPC-conscious market.