The 10 loft conversions from Google's results for Harrow, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleLondon
Architectural design and planning applications for home extensions are handled by Divi Design in Romford and Greater London. The firm creates extension plans and manages projects to enlarge and reconfigure residential living spaces.
020 3488 2828 Divi-Design, 124 City Rd, London EC1V 2NX
on GoogleHarrow
Build Worth manages design and construction projects, including loft conversions and house extensions, throughout London. The firm also fits kitchens and bathrooms alongside completing commercial building works and property refurbishments.
020 3769 7057 20 Irvine Ave, Harrow HA3 8QE
on GoogleColdharbour Ln, Hayes
Loft Conversion Harrow provides loft conversion services in Coldharbour Lane, Hayes, and the surrounding areas.
020 8158 4006 Unit 9, Business Studios, Coldharbour Ln, Hayes UB3 3BB
on GooglePotters Bar
Abbey Lofts completes attic conversions and extensions across East London, handling dormer, mansard, hip-to-gable, and Velux projects. Its services also encompass wrap-around and rear home extensions for various property styles, from terraced houses to bungalows.
020 3581 0354 1 Whaley Rd, Potters Bar EN6 2RA
on GoogleChiswick, London
Touchstone Lofts provides attic transformations and home extensions, covering everything from architectural design and planning to building work. Its projects include dormer, mansard, hip-to-gable, and rooflight conversions for various house types, as well as structural engineering services.
020 7870 1117 2 Watchfield Ct., Sutton Ct Rd, Chiswick, London W4 4NA
on GoogleHarrow
Simply Loft carries out home extensions and attic conversions for properties across West London, including Richmond, Acton, and Chiswick. The team manages the full process from initial consultation to structural completion to expand living space.
on GoogleHarrow
Unique Lofts designs and builds loft conversions and home extensions and takes on roofing work, with projects in Harrow and Enfield. Its conversions add bedrooms, bathrooms or home offices, with the storage layout and the number and style of windows chosen by the homeowner.
on GoogleAbridge, Romford
Absolute Lofts provides loft conversion services in Abridge, Romford.
0800 243 048 Patch Park Farm, 158 Ongar Rd, Abridge, Romford RM4 1AA
Harrow
Access Loft Conversions transforms attic spaces for homeowners in Croydon. The firm completes dormer and Velux projects to add extra bedrooms, home offices, and creative studios.
Harrow
Loft Buddy specialises in dormer loft conversions across Harrow, including North Harrow, Rayners Lane, and Kenton. The firm works primarily on 1930s semi-detached suburban houses.
In Harrow, velux / rooflight typically costs £28,500 – £40,500. Labour in Greater London runs 15% above the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "loft conversion harrow". They are ranked on Google rating, online presence and other factors.
The figures above are Harrow ranges. These explain what drives them, so you can read a quote properly.
Loft conversion prices by type for 2026, including VAT, with London figures, the fees and extras a builder's quote leaves out, and when planning permission applies.
When a loft conversion needs planning permission in England, the 40 and 50 cubic metre limits for dormers, what a certificate costs, and the rules in Wales, Scotland and Northern Ireland.
What a dormer loft conversion costs in 2026, the dormer types, whether your loft has the height, the planning and building regulations rules in each nation, and how long it takes.
Usually not. Most fall under permitted development if you stay within 40 cubic metres for a terrace or 50 for a semi or detached, do not go above the existing roof ridge, and use materials in keeping. Mansards and anything on a flat or in a conservation area normally do need permission.
Six to eight weeks for a dormer once work starts, plus four to eight weeks beforehand for drawings, structural calculations and building control. Scaffolding usually goes up a week ahead.