House Extensions Kilburn

Most Kilburn homes are flats, in red-brick mansion blocks, converted period houses and post-war estates, but its side streets also hold Victorian terraces with room to grow. GS Renovation builds extensions across NW6, and with our founder's 30+ years of experience, we handle foundations, steelwork, roofs and fit-out, while guiding you through what Brent Council, or Camden Council east of Kilburn High Road, will and will not allow.

In Kilburn, a single-storey rear extension typically starts from £40,000, or £2,000 to £2,800 per m² (indicative London ranges, Architecture for London, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Kilburn: the structural engineer we appoint designs the structure, we build it, and building control signs it off.

Rear and side-return extensions in Kilburn

On Kilburn's Victorian terraces the most popular projects are the rear and side-return extension, which fill the narrow gap beside the closet wing to widen a cramped kitchen into an open-plan family space. We dig and pour the foundations, build the walls, install the steel that carries the original rear wall and lay a flat or pitched roof with rooflights to pull daylight deep into the plan.

Whether your extension is permitted development or needs a full planning application depends on the property. Many Kilburn terraces can extend to the rear under permitted development rights, but flats do not have those rights. In a conservation area a single-storey rear extension can still be permitted development unless an Article 4 direction removes it, but a side or two-storey extension cannot, and earlier extensions can use up the allowance. Planning goes to Brent Council, or Camden Council east of Kilburn High Road. We check your address first, coordinate the right application with your designer and give you the drawings for any party wall notices you serve on your neighbours.

Housing in Kilburn

Of the 17,940 homes the valuation list records in Kilburn, 48% were built before 1919, 2% between the wars and 49% since 1945; 92% are flats and 8% are houses. Since most homes here are flats, a flat in Kilburn has no householder permitted development rights, so extending one needs planning permission and the freeholder's consent.

Extending one of Kilburn's houses or a ground floor flat

Only 8% of homes in Kilburn are houses, so a rear extension here is a project open to relatively few owners. For those who have one, the depths in Brent's Residential Extensions and Alterations SPD are what a planning application for an attached home is judged against. A one storey addition can reach 6 metres from the original rear wall, and a two storey one is capped at 3 metres. The original rear wall is the starting line, so any earlier rear addition needs dating before the design begins.

Street by street, the conservation areas add their own layer. The Kilburn Conservation Area has an Article 4(1) direction, made to come into effect on 18 December 2021 if confirmed, and Brent's North Kilburn Conservation Area has its own article 4 direction and design guide. A ground floor flat owner with a garden faces a different question altogether, since a flat extension needs planning permission and the freeholder's consent whatever its size. In Kilburn that owner should expect the freeholder to ask how the extension affects the flats above.

Double-storey and wrap-around extensions in Kilburn

Where a Kilburn terrace has a generous plot, a wrap-around extension combines the rear and side-return into one larger footprint, and a double-storey scheme adds a bedroom or en-suite above. These larger builds usually mean deeper foundations, more steelwork and careful matching of the red brick and detailing so the addition sits comfortably against the Victorian original. We coordinate the engineer's structural design and the finishes together.

A two-storey or wrap-around extension almost always needs planning permission from the council rather than permitted development, and because the flank and rear walls are usually shared, the Party Wall Act applies and you serve notices on the adjoining owners. Building regulations govern the foundations, the steel beams, the insulation and the fire separation. We coordinate the planning, the build around any party wall awards and the building control inspections so the whole project runs to one programme.

Kitchen extensions in Kilburn

92% of homes in Kilburn are flats, and a flat has no householder permitted development, so a ground-floor flat's kitchen extension needs planning permission from Brent Council or Camden Council and the freeholder's consent. With so few houses here, the realistic kitchen gain in most Kilburn homes is a better layout inside the flat rather than an extension. The fit-out is priced on its own page, kitchen renovation in Kilburn; the build figures are in the table above.

• Levels, drainage and landscaping made good around the new build
• Flat and pitched roofs with rooflights or lanterns
• Roof works and structural alterations at roof level

VOA Council Tax stock of properties, March 2025, for Kilburn West, Kilburn Park, Kilburn Grange and Kilburn East. Counts rounded by the VOA.

Two or three things usually come up alongside house extensions on a Kilburn job: RSJ and steel beam installation in Kilburn, house extensions across Brent, basement extensions, a garage conversion instead, house extensions anywhere in London and Garage Conversion Cost.

Trusted House Extensions in Kilburn

Extending in Kilburn means dealing with tight terraced plots, shared walls and the planning rules of Brent and Camden Councils all at once. GS Renovation brings our founder's 30+ years on the tools, so we know when your project is permitted development and when it needs a planning application, and we deliver the groundworks, steel, roof and fit-out under one accountable team.

• Insulation and thermal detailing to current regulations
• Structural engineer instructed and coordinated on your behalf
• Programme planned around party wall notice periods before excavation near a neighbour

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.