Single and double storey extensions in Greenwich. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions throughout Greenwich, from side-return infills on Victorian terraces in Charlton to rear additions on Eltham and Woolwich family homes. With over 30 years across SE3, SE7, SE9, SE10 and SE18, we handle foundations, steel, roofing and fit-out, and guide you through whether the work is permitted development or needs planning.

The classic Greenwich extension opens up the back of a Victorian terrace by filling in the side return and pushing out to the rear. These SE7 and SE18 terraces have a narrow closet wing and an awkward L-shaped kitchen, so squaring off the footprint transforms the ground floor. We dig and pour foundations to suit the ground, then carry the existing wall on steel to create one open kitchen-diner.
Double storey and wrap-around extensions suit the larger plots found around Blackheath and the leafier streets of Eltham. Whatever the shape, we manage the groundworks, the steel, the new roof and the drainage as one job. Because homes near Greenwich Park often sit in conservation areas, we design to respect the street and prepare the drawings the Royal Borough of Greenwich will want to see.
Not every extension in Greenwich needs planning permission. Many single storey rear extensions fall under permitted development, but that right is often removed or restricted in conservation areas and never applies to listed buildings, both common in SE3 and SE10. We assess your property early, tell you honestly whether you can build under permitted development or must submit a full application to the council, and handle the paperwork either way.
Whichever route applies, the structural side still needs building regulations approval, with building control inspecting the foundations, steel and drainage as work proceeds. Where your extension sits against a neighbour's boundary or a shared wall, the Party Wall Act comes into play too. We coordinate the planning, the building control and the party wall notices so nothing stalls the programme on site in Woolwich or Charlton.
Greenwich homeowners choose GS Renovation because we run the whole extension, the design, the council application, the groundworks, the steel and the full fit-out, under one accountable team. With 30+ years in SE9, SE10 and SE18 we know the borough's period stock and conservation rules, and we keep your home liveable and the site tidy throughout.
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
There is no fixed price for house extensions in Greenwich, because so much depends on your property and what you want to achieve. We survey first, then provide a transparent written quotation. Contact GS Renovation on 07472 424 226 for a free estimate. 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 Greenwich 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 Greenwich 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 Greenwich clients recommend us.
Many single-storey rear extensions in Greenwich 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 Greenwich's homes are period, Georgian and listed properties, and we renovate them regularly. We plan each house extensions around their particular characteristics, such as conservation and listed-building rules, solid walls and original period features, so the result suits the building and meets building control.
It depends on your property. Many single storey rear extensions are permitted development, but if your home is listed or sits in one of Greenwich's conservation areas near the Park or Blackheath, those rights are usually restricted and a planning application to the Royal Borough of Greenwich is needed. We check your specific address first and advise before any design work begins.
We do. GS Renovation covers all of Greenwich and the SE3 area and the wider South East London. Call 07472 424 226 and we will confirm we work on your road.
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 Greenwich. 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 Greenwich and the surrounding areas. Explore a nearby location:
Contact GS Renovation today for a free, no-obligation quote for house extensions in Greenwich.
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