Single and double storey extensions in Wimbledon. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Wimbledon, from side-return infills on SW19 terraces to full rear and wrap-around additions near Wimbledon Common. With more than 30 years working on the borough's Victorian and Edwardian housing, we handle foundations, steelwork, roofing and fit-out as one accountable project for families in Merton.

The bay-fronted terraces around Wimbledon typically have a rear closet wing and a narrow side return running alongside the kitchen. Infilling that side return, often combined with a rear extension, is the classic SW19 project. It widens a pinched galley kitchen into a proper open-plan kitchen-diner, floods the back of the house with light through rooflights and glazed doors, and opens onto the garden without losing much outdoor space.
We start with foundations and groundworks suited to the ground and any nearby trees, then bring in steel beams to carry the existing rear wall and the new roof. Because these terraces share boundaries, a party wall agreement with the neighbour is usually needed. We manage the excavation, the steel, the roof and the internal opening-up so the new and old parts read as one continuous space.
Not every Wimbledon extension needs a planning application. Many single-storey rear and side-return projects fall under permitted development rights, provided they stay within the limits on depth, height and materials. Double-storey extensions, work on the front elevation, and homes in conservation areas or that are listed usually do need a full application to Merton Council, and permitted development rights can be restricted in some parts of SW19.
We assess your specific property before drawing anything, because the right route depends on your plot, your neighbours and whether local rights have been removed. Whichever path applies, the structural elements must still meet building regulations, which is separate from planning. We prepare the drawings, submit to Merton Council where required, arrange building control inspections and see the whole extension through to a finished, decorated fit-out.
GS Renovation gives Wimbledon homeowners a single team for the entire extension: foundations, steel, roof, party wall coordination and the full internal finish. We are straight about whether your project is permitted development or needs a Merton Council application, we build to building regulations, and 30+ years in SW19 means fewer surprises on these period terraces.
Saaid is the best craftsman I have worked with. He knows what he is doing from the very beginning. He has a great knowledge of construction…
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave…
George is a very hard working builder, and has done a fantastic job on replacing my Bathroom. His attention to detail was great and I wouldn't…
FAQ
Often a little, and the reason is making good rather than the structural work. Solid-wall Victorian terraces with original chimney breasts and suspended timber floors rarely have regular dimensions, so house extensions at an SW19 address takes more time in plaster and joinery than in a newer house. GS Renovation allows for that in the Wimbledon quotation instead of discovering it midway. The structural element itself is usually comparable. Ring 07472 424 226 and GS Renovation will explain what your SW19 property is likely to need. 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.
We will not open your house and disappear. House extensions at an SW19 property is scheduled so that the Wimbledon job runs continuously through to making good and sign-off. GS Renovation keeps one team accountable rather than passing the Merton site between subcontractors. If a genuine emergency pulls anyone away you are told immediately, not afterwards. The Wimbledon programme and the Merton Council inspection dates are reissued whenever anything at the SW19 property changes.
All of the building control side, and most of the rest. The application to Merton Council, the inspection bookings and the certificate for a house extensions job at SW19 are handled by GS Renovation rather than left with the Wimbledon client. Party wall notices are prepared by us but must be served by you as building owner. We explain exactly what that involves. Email info@gsrenovationltd.co.uk for the Merton detail. Nothing about the Merton application is left for you to chase.
It can. The Community Infrastructure Levy applies above 100 square metres of new floorspace, though a residential extension to your own home usually qualifies for relief if it is claimed before work starts. Missing that claim is expensive, so we flag it early on Wimbledon projects.
A different method, not a different quality. What changes on house extensions in solid-wall Victorian terraces with original chimney breasts and suspended timber floors is the amount of investigation beforehand and the care in reinstatement afterwards at the SW19 address. GS Renovation programmes both into the Wimbledon job. The structural stage in between runs much as it would anywhere in Merton. Email info@gsrenovationltd.co.uk and we will explain what house extensions at an SW19 property in Wimbledon involves before you commit yourself to anything.
Often it will not. Many single-storey side-return and rear extensions in Wimbledon qualify as permitted development if they stay within the size and height limits. However, if your home is in a conservation area, is listed, or has had its permitted development rights removed, you will need a full application to Merton Council. We check your property first and take whichever route applies.
All of them, and small jobs are welcome. GS Renovation carries out house extensions throughout Wimbledon and Merton, and a modest piece of work at an SW19 address is often how a longer relationship begins. Quotes are free and carry no obligation. Call 07472 424 226 and describe what you need. We will be honest if another Mitcham trade suits you better. Nothing at all is owed for the SW19 survey or the written quotation.
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 Wimbledon. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Wimbledon and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Wimbledon. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.