Single and double storey extensions in Willesden. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Willesden, from single storey rear additions to full wrap-arounds on the Victorian and Edwardian terraces of NW10. With over 30 years in Brent, we handle groundworks, steelwork, roofing and the complete fit-out, and we tell you honestly whether your plans are permitted development or need a planning application.

The bay-fronted terraces around Willesden Green and towards Harlesden nearly all have a side return, that narrow strip of open ground beside the rear closet wing. Filling it in is one of the most effective ways to widen a cramped Victorian kitchen and pull daylight in through a glazed roof. We dig and lay the foundations, tie the new structure into the existing brickwork, and open the flank wall with a steel beam.
A rear extension pushes further into the garden and often combines with the side return to form a wide, open-plan kitchen-diner across the back of the house. We manage the groundworks, the drainage connections, the steelwork over the new openings and the roof, then complete the plastering, glazing and finishes so you deal with one team from the first trench to the last coat of paint.
Many single storey rear extensions on NW10 terraces fall under permitted development, meaning you can build within set size and height limits without a full planning application. Larger schemes, double storey additions, anything to the front, and work in a conservation area or on a listed building will need permission from Brent Council. We assess your specific house and tell you which route applies before you commit, rather than assuming.
Because Willesden terraces are attached, excavating foundations near the boundary and building up against the party wall triggers the Party Wall Act, so notices go to your neighbours before we start. Whichever planning route your project takes, the structure is separately covered by building regulations, and building control inspects the foundations, the steel and the drainage as the extension goes up.
Willesden owners choose GS Renovation because we build extensions end to end and stay honest about the rules. We know which NW10 projects are permitted development and which need Brent Council permission, we serve the party wall notices these attached terraces require, and 30+ years of local building means the foundations and steel are done properly.
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great attention to detail. I've already recommended him to others.
Splendid job on our new kitchen refurb, including new flooring, moving the services, installing RSJ and preparing space for new back doors… George was always friendly, communicative and has an excellent attention to detail, ensuring everything is finished to a high standard.
Giorgio is an excellent and intelligent workman, and with very reasonable prices!… He paid a lot of attention to detail that is not common at all, and the final result was immaculate. Highly recommended!
FAQ
Pricing house extensions in Willesden comes down to the size of the job, the specification you choose and the condition of the property. Rather than guess, we survey and give you a fixed, itemised quote you can rely on. Call 07472 424 226. As a rough guide, house extensions in London typically starts from roughly £40,000 for a single-storey rear extension and rises with size and specification (indicative London ranges, MyBuilder and Checkatrade, 2026). Your figure depends on the size, specification and condition of the property, which is why we survey before quoting.
A straightforward Willesden project can be done in a couple of weeks, while a larger house extensions with structural work runs longer. We set out a realistic, stage-by-stage programme before we begin so there are no surprises.
Because we manage every trade in-house, your Willesden project stays consistent and accountable from first fix to finish. Add transparent pricing, full insurance and real aftercare, and it is easy to see why Willesden clients recommend us.
Many single-storey rear extensions in Willesden fall under permitted development, but side returns, double-storey extensions and work in conservation areas usually need full planning permission. We assess your property and manage both the planning application and building control.
Yes. A large share of Willesden's homes are Victorian and Edwardian terraced properties, and we renovate them regularly. We plan each house extensions around their particular characteristics, such as solid brick walls, rear closet wings, side returns and original period features, so the result suits the building and meets building control.
It depends on the property. Many single storey rear extensions on NW10 terraces are permitted development if they stay within the size, height and depth limits. Double storey work, front extensions and anything in a conservation area or on a listed building need a planning application to Brent Council. We assess your house first, then handle the building regulations and any party wall notices either way.
Yes, Willesden is one of our core areas. We work on every street and the NW10 area and across the wider North West London, so wherever your home is, call 07472 424 226 and we will confirm we can help.
Every Service, One Team
The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Willesden. Explore what else we do locally:
Steel beam installation, RSJ and structural alterations.
Safe load-bearing wall removal with steel beam support.
Structural alterations, new openings and steel support.
Chimney breast removal with gallows bracket or beam support.
Open-plan kitchen, diner and living conversions.
Full refurbishments and whole-house renovations.
Bespoke kitchen design and installation.
Luxury bathroom and wet-room refurbishment.
Same Service, Nearby Areas
We carry out house extensions across Willesden and the surrounding areas. Explore a nearby location:
Contact GS Renovation today for a free, no-obligation quote for house extensions in Willesden.
Get Your Free Quote