Single and double storey extensions in Southall. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Southall, where 1930s semi-detached and interwar houses sit on the generous plots that make additions so worthwhile. With over 30 years of experience in the UB1 area, we handle foundations, steel, roofing and full fit-out, and we guide you through Ealing Council planning from the very first drawing.

The wide plots typical of Southall's interwar semis lend themselves to single and double storey rear extensions, side-return infills down the flank, and wrap-around schemes that combine the two. We start with proper groundworks, digging and pouring foundations to suit the ground and the neighbouring structures, then build up in blockwork and brick to match the character of the 1930s stock. Steel beams tie the new opening back to the existing house so the ground floor flows as one space.
Because these semis are attached, a rear or side extension often runs alongside a shared party wall, so party wall notices to the adjoining owner are usually part of the job. We manage the roof works, the glazing, the insulation and the internal fit-out through to decoration, so you deal with one team from footings to finish. The generous Southall gardens mean you can extend meaningfully and still keep a proper outdoor space.
A key early question in Southall is whether your extension falls under permitted development or needs a full planning application to Ealing Council. Many single storey rear extensions on interwar semis can proceed under permitted development rights, subject to size, height and boundary limits, but double storey and wrap-around schemes, or homes where those rights have been removed, usually need planning permission. We assess your specific UB1 property before committing to a design.
Whichever route applies, all the structural work is governed by building regulations, so foundations, steel beams, drainage and insulation are inspected and signed off by building control. We prepare and submit the paperwork, liaise with the council and coordinate the party wall side with your neighbours. Getting the consents right at the start protects you later, especially when you come to sell a home in the settled residential streets around Southall and Hanwell.
Southall homeowners choose GS Renovation because we build the whole extension and manage the consents. We tell you honestly whether your scheme is permitted development or needs an Ealing Council application, we handle foundations, steel and party wall notices, and building control signs off the structure. With 30+ years on West London interwar homes, you get one team accountable from footings to final decoration.
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 Southall 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.
How long house extensions takes in Southall depends on the size of the job, but we always agree a programme before starting and stick to it, keeping you informed from the first day to the last.
Southall homeowners choose GS Renovation for reliability and quality. We are fully insured, building control compliant where needed, and bring over 30 years of hands-on experience to every house extensions project, with a single point of contact throughout.
Many single-storey rear extensions in Southall 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 Southall'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 Southall interwar semis fall under permitted development, subject to size and height limits, but double storey and wrap-around schemes, or homes where those rights have been withdrawn, usually need a planning application to Ealing Council. We check your specific UB1 property first. Either way, the structural work is inspected and signed off under building regulations.
Yes, Southall is one of our core areas. We work on every street and the UB1 area and across the wider West London, so wherever your home is, call 07472 424 226 and we will confirm we can help.
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 Southall. 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 Southall and the surrounding areas. Explore a nearby location:
Contact GS Renovation today for a free, no-obligation quote for house extensions in Southall.
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