Areas covered
Property assessment and installation are arranged by postcode across London. Major service areas:
Housing in London and what it means for insulation
London's stock is older and denser than anywhere else in the country: Victorian and Edwardian terraces with butterfly and London roofs, mansion flats, and enormous inter-war suburban belts in Metroland and the outer boroughs. Loft conversions are the most common way to add space, so rafter-level insulation, dormers and room-in-roof work dominate. Conservation areas, party-wall considerations and tight access change how projects are planned.
Common insulation projects in the region
- Loft conversion insulation in Victorian and Edwardian terraces
- Room-in-roof upgrades in inter-war semis across the outer boroughs
- Dormer and rear-extension roof insulation
- Top-floor flat and maisonette roof insulation
- Replacing old insulation during re-roofing
What we see across London
- Loft conversion headroom
- Dormer and mansard insulation
- Top-floor flat roof heat loss
- Re-roofing with insulation added
Qualitative pattern from the housing stock; replaced with aggregated, anonymised enquiry data as it builds.
Butterfly roofs, mansards and party walls
London's terraces bring roof forms — butterfly, London, mansard — that suburban rules do not cover, plus party-wall agreements and conservation areas. Every rafter-level job here starts with a drawing of the actual roof.
Why foil may suit some homes here
Headroom is the constraint in almost every London loft conversion. Multifoil with a PIR layer reaches the target in less depth than board alone, which is often the difference between a usable room and a crawl space. The decision rests on the whole roof build-up — rafter depth, ventilation, moisture, existing insulation and intended use — not on material thickness alone. Foil insulation guide.
Why foil may not suit others
Butterfly-roof terraces with a cold loft that will never be used are better served by conventional insulation at ceiling level. A straightforward cold loft with good access is often more appropriately upgraded with conventional mineral-wool loft insulation than a rafter-level foil system, and we say so when it is.
Field team
London Field Team
Supporting homeowners across North London, South London, East London, West London, Croydon, Bromley, Harrow and surrounding areas with property assessment to one national standard.
How it works in London
- Enter your postcodeWe tell you the coverage position for the area before asking for anything else.
- Tell us about the propertyType, what you want to improve, what is there now, the main problem.
- Property assessmentWhere a physical inspection is needed: roof and loft construction, existing insulation, ventilation, moisture, depth, access.
- RecommendationFoil, multifoil or an alternative — chosen for the property, not the search term.
- QuoteFixed price with the build-up, product, certificate and inclusions stated.
- InstallationAllocated to appropriate installation capacity, photographed and recorded to one standard.
What foil insulation costs in London
We do not publish invented regional prices. What moves a quote here is the same as anywhere else:
- property size and roof area
- access to the loft or roof space
- what insulation is there now and whether it stays
- the system selected — multifoil alone, multifoil with PIR, or an alternative
- preparation work, including removal of old material or spray foam
- ventilation and detailing at eaves, dormers and penetrations
National indicative ranges are in the foil insulation cost guide; as genuine project data from London builds, regional ranges will be published here.
Recent foil insulation projects in London
Documented projects in London are added to the project library as they complete — property, survey findings, system chosen and why, duration and photographs. Until then the library's typical project scenarios show how the housing described above is assessed.
Professional installation
Installation is arranged through the national foil insulation installer page: survey first, written build-up, fixed quote, one standard. How installers are matched.