Single and double storey extensions in Havering. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Havering, working with the generous plots that come with its 1930s semis and interwar suburban houses. From Romford to Upminster, our team has spent more than 30 years adding rear, side-return, wrap-around and double-storey space in RM1 to RM14, handling the groundworks, the steel and the fit-out.

The interwar semis that line Havering's streets usually sit on wider plots than inner London terraces, with side access down one flank and a good depth of rear garden. That makes side-return infills and single-storey rear extensions particularly rewarding here, squaring off the kitchen and creating a large open-plan family space. We start with proper foundations, matched to the ground conditions, then build up in blockwork or brick to blend with the original 1930s elevations.
Double-storey extensions suit the generous semis of RM11 and RM14, adding a bedroom and often an en-suite above an enlarged ground floor. Where the new opening joins the existing house, we install steel beams sized by a structural engineer, and the whole build is inspected by building control at foundation, damp-proof, structural and completion stages. Because many of these homes are semi-detached, we also handle any Party Wall Act notices with the adjoining owner before groundworks begin.
Not every extension in Havering needs planning permission. Many single-storey rear and side additions fall under permitted development rights, provided they stay within the limits on depth, height and materials. Larger schemes, double-storey work, front extensions or anything on a designated property will usually need a full planning application to Havering Council. We assess your specific house early, so you know from the outset whether you are working under permitted development or applying for permission.
Separate from planning, every structural extension must meet the Building Regulations, so building control signs off the foundations, insulation, drainage and steelwork regardless of the planning route. We manage both strands together, submitting drawings, liaising with the council and booking inspections at each stage. Once the shell is weathertight, the same team carries on through plastering, electrics, plumbing, flooring and decoration, so your new Havering extension is finished and ready to use rather than left as a bare box.
Havering homeowners choose GS Renovation because one team takes an extension from first drawings and council submission through groundworks, steel and full fit-out. With 30+ years across RM postcodes, we understand how the borough's interwar semis and their generous plots behave, we advise honestly on permitted development versus planning, and we keep the site tidy while you live alongside the 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
Every Havering project is priced on its own merits, as the cost of house extensions varies with the size, specification and condition of the home. We give a clear, itemised quote up front with no obligation. Call 07472 424 226 for an estimate tailored to your property. 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.
Most house extensions projects in Havering take between two and eight weeks depending on the scope and whether structural work is involved. We provide a clear programme before work begins so you know exactly what to expect.
Because we manage every trade in-house, your Havering project stays consistent and accountable from first fix to finish. Add transparent pricing, full insurance and real aftercare, and it is easy to see why Havering clients recommend us.
Many single-storey rear extensions in Havering 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 Havering'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 your house and the size of the extension. Many single-storey rear and side-return projects on Havering's interwar semis fall within permitted development, while double-storey, front or larger schemes generally need a planning application to Havering Council. Either way the work still needs Building Regulations approval. We check your property first and guide you down the right route.
Absolutely. Our team works right across Havering and the RM1 area and neighbouring parts of East London. Get in touch on 07472 424 226 to check coverage for your address.
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 Havering. 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 Havering and the surrounding areas. Explore a nearby location:
Contact GS Renovation today for a free, no-obligation quote for house extensions in Havering.
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