Single and double storey extensions in Hammersmith. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions throughout Hammersmith, tailored to the bay-fronted Victorian and Edwardian terraces that fill the W6 streets between the River Thames and Westfield London. Drawing on more than 30 years of building experience, we handle foundations, steelwork, roofing and full fit-out to add usable space to these period terraced homes.

The classic Hammersmith project fills in the side return alongside the rear closet wing, widening a narrow galley kitchen into a bright open-plan space that runs the full width of the house. On tighter W6 plots we often combine the side return with a modest rear extension, then knock through into the middle reception room with a steel beam to create a single kitchen-diner opening onto the garden.
We start with proper foundations and groundworks, allowing for the shallow footings and drain runs common on these older terraces, then build the walls, install the steel and form the roof. Rooflights and glazed rear doors bring light deep into the plan, which matters in period houses where the middle of the terrace can otherwise feel dark.
Some extensions in W6 fall under permitted development, but many do not, so the route depends on your specific property. If your home sits in a conservation area, has been previously extended, or you want a larger footprint, you will usually need a full planning application to Hammersmith and Fulham Council rather than relying on permitted development rights.
Either way, the structural work is covered by building regulations and inspected by building control, which is separate from planning. Because these terraces share party walls with both neighbours, most extensions also trigger Party Wall Act notices for excavation near the boundary or for cutting into the shared wall. We guide you through all three strands so the project starts on solid legal footing.
Hammersmith homeowners choose GS Renovation because one team manages the extension from foundations to final decoration, including the steelwork, roofing and services. We know the W6 terraced stock, we advise honestly on whether you need planning permission or permitted development, and we handle the party wall matters that come with building tight against neighbours, all backed by 30+ years of work.
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 Hammersmith 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 Hammersmith 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 Hammersmith 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 Hammersmith 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 Hammersmith'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 side-return and rear extensions in W6 qualify as permitted development, but conservation area status, previous extensions or a larger footprint often require a full planning application to Hammersmith and Fulham Council. We assess your specific terrace early, advise on the likely route, and handle the building regulations and party wall notices whichever way the planning falls.
We do. GS Renovation covers all of Hammersmith and the W6 area and the wider West 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 Hammersmith. 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 Hammersmith and the surrounding areas. Explore a nearby location:
Contact GS Renovation today for a free, no-obligation quote for house extensions in Hammersmith.
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