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.
What can I say!!! George is an extremely lovely man his workmanship is second to none, he has an excellent eye for detail and nothing was to much…
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
Punctual, worked hard, and did exactly what he was asked and what he said he would do. Overall, a very high quality job. Will use again.
FAQ
Set aside the structural element, the finishing trades and the approvals as three separate amounts. That is how the house extensions quotation for a Havering home is laid out, and it is why the RM1 survey happens before any figure is discussed. The engineer's fee, where house extensions need a design, is shown rather than buried. Ask GS Renovation on 07472 424 226 for the current position in Havering. The survey at the RM1 property is free, in Havering and across Havering. 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.
The whole sequence is set out for you at the start. Survey, quotation, engineer where house extensions need one, Havering Council approval, then construction at the RM1 property, each with an indicative duration. GS Renovation updates a Havering client weekly once work begins. That way nobody in the Havering household is guessing when the house comes back. Ring 07472 424 226 and GS Renovation will set out the whole sequence for an RM1 home in Havering.
Enough to know where the problems hide in an RM1 property before quoting. House extensions in interwar semi-detached housing throws up variation that a modern estate does not, and 30 years of hands-on experience is what turns that into an accurate Havering figure rather than a cautious one. GS Renovation has been incorporated since 2023. The experience behind it is considerably older. Ask on 07472 424 226 about Havering projects. References near RM1 are given as addresses, not testimonials.
Usually, if you are excavating near a neighbour's foundations or building on the line of junction, both common on Havering plots. Notice is served before work starts and a schedule of condition protects both parties. We prepare the paperwork for your RM1 address.
Expect the survey to take longer, and be glad of it. Understanding how an interwar semi-detached Havering house is actually built is what makes a house extensions quotation hold at RM1, and assumptions are what turn a fixed price into a variable one. GS Renovation would rather spend the extra hour first. The Havering visit is free and carries no obligation. The RM1 survey comes before any house extensions decision, and it costs a Havering homeowner nothing.
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.
Both, and the borough is not the limit. GS Renovation carries out house extensions throughout Havering and the RM1 area and across neighbouring areas, which is why the team is rarely far from an RM1 property. Free survey, written quotation, no obligation. Email info@gsrenovationltd.co.uk with the address for a visit. We will say plainly if an East London property is too far out. Aftercare and snagging afterwards are handled from the same RM1 team as the build.
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:
Same Service, Nearby Areas
We carry out house extensions across Havering and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Havering. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.