Single and double storey extensions in Welling. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Welling, working with the 1930s semi-detached and interwar houses that give DA16 its character. Those generous plots and side accesses suit rear and side-return additions particularly well. With 30+ years in Bexley, we handle the foundations, steelwork, roof and full fit-out as one managed project.

The wide, deep gardens common to Welling's interwar semis are ideal for single storey rear extensions that open the kitchen onto the garden, and the side access many of these houses retain makes a side-return or wrap-around addition genuinely practical. We start with proper foundations and groundworks sized to the ground conditions on your plot, then build up in blockwork to match the existing brickwork and rooflines of the 1930s streetscape.
Double storey extensions add a bedroom and often an en-suite above a larger kitchen below, which suits families staying put in DA16 rather than moving on. We install the steel beams that carry the new openings, tie the new structure into the original house correctly, and complete the roof works so the finished extension reads as part of the original interwar home rather than an afterthought bolted on the back.
An extension may fall under permitted development or it may need a full planning application to Bexley Council, and which route applies depends on the size, the height and whether your property sits under any restrictions. Many modest single storey rear extensions in Welling proceed under permitted development, while larger, double storey or more prominent schemes need consent. We advise honestly on the likely route before you commit and prepare the drawings either way.
Whichever planning route applies, the building work itself must meet building regulations, with foundations, steel, insulation and drainage all inspected and signed off. Because these are semi-detached houses, extensions near the shared boundary usually trigger the Party Wall Act, so we serve notice on the neighbour in good time. Getting the planning, the building control and the party wall matters aligned early keeps a Welling extension moving without avoidable delays.
Welling homeowners choose GS Renovation because we manage the whole extension under one roof, from the first foundation to the final coat of paint. We know how Bexley Council handles permitted development and full applications, and how the party wall rules affect semis. With 30+ years locally, you deal with one team that stands behind the result.
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
We price each Welling project individually, because the cost of house extensions depends on far more than floor area. After a free survey you receive a clear written breakdown with no hidden extras. Call 07472 424 226 or email info@gsrenovationltd.co.uk. 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 Welling 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.
GS Renovation's team brings over 30 years of hands-on experience to house extensions and wider building work across Welling and the surrounding area. We offer free quotes, a dedicated project manager, full insurance, building control compliance where required, and comprehensive aftercare.
Many single-storey rear extensions in Welling 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 Welling's homes are 1930s and interwar properties, and we renovate them regularly. We plan each house extensions around their particular characteristics, such as cavity walls, regular original layouts and the generous plots that suit extending, so the result suits the building and meets building control.
It depends on the property. Many single storey rear extensions on Welling's interwar semis fall within permitted development, so no planning application is needed, but larger, double storey or more prominent schemes usually require consent from Bexley Council. Either way the work must meet building regulations. We assess your specific plot and advise on the correct route before any drawings are finalised.
We do. GS Renovation covers all of Welling and the DA16 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 Welling. 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 Welling and the surrounding areas. Explore a nearby location:
Contact GS Renovation today for a free, no-obligation quote for house extensions in Welling.
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