GS Renovation builds loft conversions in Willesden, on the Victorian terraces running through NW10 towards Kilburn and Harlesden. Many of these houses have been split into flats over the years, so we establish the ownership position first, then design around the roof form the terrace was actually built with.
Working with an NW10 terrace roof
Some Willesden terraces have a conventional pitched rear slope, which takes a dormer straightforwardly. Others were built with a valley or butterfly roof, where two slopes drain into a central gutter behind a front parapet, and converting one of those means rebuilding the valley and its drainage as part of the job rather than working around it. We establish which you have at the survey, along with the ridge height, which needs to be roughly 2.2m to 2.4m above the existing ceiling joists.
Where the house keeps its rear closet wing, an L-shaped dormer over the main slope and the wing is what turns a single awkward room into a double bedroom with an en suite, at roughly £55,000 to £80,000 on indicative London ranges for 2026. A plain rear dormer serving one room runs roughly £45,000 to £65,000. If the roof is generous and the budget is not, a rooflight conversion at roughly £30,000 to £45,000 is worth a look.
Ownership, consents and Brent Council
If your NW10 home is a flat in a converted house, the loft is normally retained by the freeholder and the building has a shared fire escape route, so a conversion is usually not possible without consent and often not at all. On a freehold house, terraced properties are commonly cited as having 40 cubic metres of added volume under permitted development, with conditions on materials, side windows, balconies and the roof plane. Brent Council conservation areas remove those rights.
Building regulations apply regardless. That means a protected stair route to a final exit with fire doors and interlinked alarms under Part B, a compliant stair under Part K, a floor built on engineer-sized joists carried by steel beams bearing into the party walls on padstones, and insulation and ventilation to current standards. Cutting those bearings into a wall you share with a neighbour is notifiable under the Party Wall etc. Act 1996, and the duty to serve notice is yours as the building owner.
- Interlinked mains-powered smoke alarms
- Dormer cheeks, flat roof and leadwork detailed to last
- Velux and conservation rooflights fitted and flashed
- Protected stair enclosure and fire doors to Part B
- Rear dormers to win full head height across the new floor
Trusted Loft Conversion in Willesden
Willesden homeowners choose GS Renovation because NW10 roofs are not all the same, and a valley roof or a converted flat changes the job completely. We survey properly, coordinate the structural engineer, install steel to their design, prepare your party wall notices and manage Brent Council building control. Fully insured, building control compliant, with 30+ years of hands-on experience behind the founder.
- Roof made good, leadwork and guttering finished properly
- Honest updates if a date or a detail has to move
- Fully insured, with cover in place on every site
- Dust screens and floor protection in occupied homes
- Straight advice on what is and is not worth spending money on
- Ridge height measured before any design work is commissioned