Single and double storey extensions in Wallington. Trusted, professional, 30+ years' hands-on experience.
For more than 30 years GS Renovation has extended homes across Wallington, from the Edwardian family houses near Beddington Park to the terraces in the SM6 streets. Whether you want a rear kitchen extension, a side-return infill or a double-storey addition, we handle the foundations, the steelwork, the roof and the full fit-out as one project.

The side return on a Wallington terrace, that narrow strip of yard beside the rear closet wing, is often wasted space. Filling it in and extending across the back of the house creates the wide, open kitchen-diner most families want. We tie the new structure into the existing rear wall, insert a steel beam where the old external wall comes out, and match the brickwork so the extension sits naturally against the period house.
Every extension starts below ground. We dig and pour foundations to the depth building control requires, allowing for any nearby trees around Wallington's leafier roads, then build up in blockwork and brick. Steel beams carry the openings and the roof, which we finish as a pitched or flat structure with rooflights to bring daylight deep into the plan. Drainage, insulation and the internal fit-out all follow, managed by the same team from start to finish.
Some extensions in Wallington fall under permitted development and do not need a planning application, while others require full permission from Sutton Council. It depends on the size, height and position of what you are building, and whether your property sits in a conservation area or has had permitted development rights removed. We assess your home early, advise which route applies, and prepare and submit the drawings to the council where planning permission is needed.
Separate from planning, every extension must meet building regulations, and building control inspects the foundations, the steelwork, the insulation and the drainage as the work proceeds. On the terraces, a rear or side extension usually sits against a shared boundary, so party wall notices to your neighbours often come into play too. We coordinate all three, planning where needed, building control and party wall matters, so nothing holds the project up.
Homeowners across Wallington and the wider SM6 area choose GS Renovation because we take an extension from first drawings to finished room without handing you between contractors. Three decades of building in South London means we understand these terraces, the local ground and how Sutton Council handles applications. One team, one point of contact, and a build that lasts.
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
I am very happy to recommend George after he completed the work on my 2 bathrooms. He worked very hard to make sure everything was completed and even…
FAQ
No. House extensions are priced from scope, so a Wallington home is not quoted higher than the same house over in Carshalton. Where costs do rise is in period stock and awkward access, both of which are checked at the SM6 property. GS Renovation shows those as separate lines so you can see the reason. The SM6 survey costs nothing and there is no obligation afterwards, in Wallington or anywhere in Sutton. 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.
Book the survey now and decide later, because that costs nothing. It gives GS Renovation the information to programme house extensions at your SM6 home and gives you a real date rather than an estimate. Demand across Wallington and Sutton varies with the season. We will always tell a South London client honestly when the next slot genuinely is. The survey at SM6 costs nothing and commits a Wallington homeowner in Sutton to nothing.
Openly, because the alternative shows up at handover. A house extensions project in a Wallington home occasionally uncovers wiring, timber or drainage nobody could have seen at SM6, and GS Renovation treats that as a variation to agree rather than a chance to add cost. Sutton Council is notified where the change affects approved work. Nothing proceeds without your say-so. Ask for Sutton references on that point. The engineer's fee appears on the SM6 quotation in Wallington.
For a single-storey rear extension, commonly 3 metres on a terraced or semi-detached house and 4 on a detached one, with a larger allowance available under prior approval. Those rights are withdrawn in conservation areas and where Article 4 applies, so we confirm your SM6 status with Sutton Council.
Many times, and we can give you addresses. Bay-fronted Victorian and Edwardian terraces with rear closet wings and side returns dominate that part of Wallington, so house extensions on them is routine work for GS Renovation rather than something we adapt to. The 31 public MyBuilder reviews behind our 4.9 rating cover the same kind of project. Ring 07472 424 226 and we will point you at recent work in Sutton. Email info@gsrenovationltd.co.uk and we will send SM6 addresses where house extensions of this kind was carried out.
It might not. Many single-storey rear extensions in Wallington fall within permitted development, provided they stay within the size and height limits, but larger, double-storey or wrap-around builds usually need a full application to Sutton Council. Conservation area status also changes things. We check your property first and tell you exactly which route applies before any work begins.
We are on sites across Wallington and Sutton most weeks, so yes. That proximity affects three practical things on a house extensions project: how fast the SM6 survey happens, how well we know the Sutton Council process, and how quickly anyone returns afterwards. GS Renovation would rather be judged on those than on a postcode in an advert. Ring 07472 424 226 to check. References are available beforehand. The SM6 survey costs nothing and commits you to nothing.
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 Wallington. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Wallington and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Wallington. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.