Single and double storey extensions in Highbury. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Highbury, adding space to the Victorian and Edwardian terraces near Highbury Fields without losing their character. With over 30 years in N5 and the surrounding Islington neighbourhoods, we handle the foundations, the steelwork, the roof and the full fit-out, and guide you through permitted development or a planning application to Islington Council.

The side return is the strip of open ground beside the rear closet wing, and infilling it is the classic way to widen a cramped Highbury kitchen. We dig new foundations next to the existing wall, tie the new structure in, and install a steel beam where the original external wall is removed. A glazed roof or rooflights bring light deep into the plan, turning a narrow galley into an open kitchen-diner.
Many single-storey rear and side-return extensions on Highbury terraces fall under permitted development, but this is not guaranteed. If your home sits in a conservation area, has been extended before, or you want a larger footprint, a full planning application to Islington Council is likely. We assess your property first, then either apply for a lawful development certificate or prepare the planning submission, so you build on a sound legal footing.
A double-storey rear extension adds a bedroom or bathroom above a bigger kitchen, and on Highbury's generous terraced plots there is often room to do it well. We form deeper foundations to carry the extra load, build in brick or blockwork to match the existing elevation, and install steel beams at each floor. The rear closet wing can be squared off or wrapped around to create a coherent, larger footprint.
Extensions on shared boundaries bring the Party Wall etc. Act into play, since digging near or building against the neighbour's wall requires notice. In N5 you serve these notices, coordinate with Islington building control for the foundations, damp proofing, insulation and structure, and manage the roof, glazing, plastering and decoration. You deal with one team from the first trial hole to the final coat of paint.
Homeowners in Highbury choose GS Renovation because we build extensions end to end, from groundworks and steel to the finished kitchen inside. We know how N5's terraces behave, when a scheme is permitted development and when Islington Council needs a planning application, and how to keep neighbours onside with proper party wall notices. Over 30 years of local work stands behind every project.
I am very happy to recommend George after he completed the work on my 2 bathrooms. He worked very hard to make sure everything was completed and even…
Saaid is the best craftsman I have worked with. He knows what he is doing from the very beginning. He has a great knowledge of construction…
I had a bathroom refit which I was very pleased with and I then went on to get my kitchen refitted as I was so happy with the way he worked. Even…
FAQ
Not by much, and not because of the postcode. What raises a house extensions figure here is the housing rather than the location: solid-wall Victorian terraces with original chimney breasts and suspended timber floors take more making good than a modern estate. Access and parking around N5 affect the labour line too. GS Renovation prices the property in front of it rather than applying a Highbury or North London multiplier. Ring 07472 424 226 and GS Renovation will explain what actually moves the figure at N5. 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 few weeks in normal conditions, more in the busy months. Getting the free N5 survey done early is what puts a Highbury homeowner into the schedule, and GS Renovation can submit the Islington Council application while you consider the quotation. There is no deposit to reserve a slot. Ring 07472 424 226 for the current position across Islington. Nothing about a house extensions slot at an N5 address is held against a deposit in Highbury.
Dust sheeting, sealed work areas and a clear-up at the end of every day. That is standard on a house extensions project at an N5 property, not an extra billed to a Highbury client, and it is what makes staying in the house workable. GS Renovation is fully insured and keeps access routes protected. Skips and deliveries are arranged to suit the street across Islington. Ring 07472 424 226 and GS Renovation will explain the N5 protection used in Highbury.
Many single-storey rear extensions in Highbury fall under permitted development, but side returns, double-storey extensions and work in conservation areas usually need full permission. We assess your N5 property and manage both the Islington Council application and building control.
Fewer than you would think, because we look for them first. The N5 survey on a house extensions job checks the places late Victorian and Edwardian Highbury houses commonly hide trouble, so the quotation reflects reality rather than hope. Where something genuinely unforeseen appears, GS Renovation stops and re-prices openly. Weekly updates mean you hear it early, not at handover. Ask on 07472 424 226 where house extensions usually finds trouble in N5 houses of that particular age.
It depends on the property. Many single-storey rear and side-return extensions in Highbury are permitted development, but conservation area status, previous extensions or a larger footprint can push you into a full planning application to Islington Council. We assess your N5 home, confirm the route, and either obtain a lawful development certificate or handle the planning submission for you.
Yes, and at no extra cost within Islington. GS Renovation covers Highbury and the N5 area for house extensions and much of the wider North London besides. Distance only becomes a factor well beyond Angel, and we will say plainly if a property is too far. Email info@gsrenovationltd.co.uk with the postcode and we will book a free survey. Nothing is owed for the N5 visit either way. Small jobs and full projects are treated on the same basis.
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 Highbury. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Highbury and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Highbury. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.