Single and double storey extensions in Kentish Town. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions throughout Kentish Town, adding space to the Victorian and Edwardian terraces that fill NW5 between Hampstead Heath and the British Library. Drawing on more than 30 years in North London, we build rear, side-return and wrap-around extensions, handling foundations, steel, roof and full fit-out as a single managed project.

The side return is the classic Kentish Town extension. Most bay-fronted terraces here have a narrow alley of wasted ground beside the rear closet wing, and filling it transforms a dark galley kitchen into a wide open-plan kitchen-diner. We dig and pour new foundations next to the existing wall, install the steel to carry the old external wall, tie the new roof into the closet wing and rebuild so the finished space feels original rather than bolted on.
Working in tight NW5 back gardens with limited rear access takes planning. We often barrow materials through the house or over neighbouring boundaries, protect the existing brickwork and manage spoil removal carefully on residential streets. Because a side return usually meets a shared boundary, party wall agreements with the neighbours are part of the job, and you serve the notices and appoint surveyors where they are needed.
Whether your Kentish Town extension is permitted development or needs a full planning application depends on the property. Many single-storey rear extensions fall under permitted development rights, but those rights are removed or restricted on flats, on homes within a Camden conservation area, and on any listed building, of which NW5 has plenty. We assess your specific house early so you know which route applies before any design work is committed.
Where a planning application to Camden Council is required, we work alongside your architect on the drawings and guide the build to match exactly what is approved. Separately, every extension needs Building Regulations sign-off covering foundations, structure, insulation, drainage and fire safety. We keep planning and building control clearly apart, arrange the inspections at each stage and hand over the certificates at completion.
Kentish Town owners choose GS Renovation because one team takes the extension from foundations to final coat, including the steel, the roof, the party wall matters and the fit-out. We understand Camden's conservation constraints and NW5 access challenges, we price transparently, and thirty years of local terraces means fewer surprises and a build that lasts.
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave…
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
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…
FAQ
Budget for the work itself plus a sensible contingency for what a survey cannot see. On a bay-fronted Victorian terraced property near NW5 the usual unknowns with house extensions sit behind plaster and under floors, so GS Renovation prices what is visible and flags the rest openly. The Camden Council building control fee belongs in your Kentish Town budget too. GS Renovation would rather over-explain a Camden figure than surprise a Kentish Town homeowner halfway through the work. 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 programme comes with the quotation, so you know before committing. A house extensions job at an NW5 address is sequenced structure first, then services, then finishes, and that order is what keeps a Kentish Town project from looping back on itself. Drying and curing time cannot be compressed. GS Renovation builds it into the Camden schedule rather than discovering it late on site. The Kentish Town programme is reissued whenever a Camden Council inspection date moves at NW5.
Because it is inspected and certified, not simply declared finished. Camden Council inspects the structural stages of house extensions at your NW5 property before anything is concealed, and the completion certificate is handed to you at the end. GS Renovation also appoints the structural engineer where the design requires one. That paperwork is what a buyer's solicitor asks for when a Kentish Town home is sold anywhere in Camden. The Camden certificate arrives with the NW5 handover pack.
For a single-storey rear extension, commonly 3 metres on a terraced or semi-detached house and 4 on a detached one, with a larger allowance available under prior approval. Those rights are withdrawn in conservation areas and where Article 4 applies, so we confirm your NW5 status with Camden Council.
Expect the survey to take longer, and be glad of it. Understanding how a bay-fronted Victorian terraced Kentish Town house is actually built is what makes a house extensions quotation hold at NW5, and assumptions are what turn a fixed price into a variable one. GS Renovation would rather spend the extra hour first. The Camden visit is free and carries no obligation. The NW5 survey comes before any house extensions decision, and it costs a Kentish Town homeowner nothing.
It depends on the property. Many single-storey rear extensions are permitted development, but those rights are often removed for flats, for homes in a Camden conservation area, and for listed buildings, all common in NW5. We check your specific house first so you know whether a planning application to Camden Council is needed or whether permitted development applies before design begins.
The whole borough, and a good way beyond it. GS Renovation carries out house extensions across Kentish Town, Camden Town and much of North London, with no surcharge for distance within Camden. Knowing the Camden Council building control process locally is a practical advantage on an NW5 job. Email info@gsrenovationltd.co.uk with the address for a free survey. We will say plainly if a property is too far out. Aftercare is no harder from one end of the borough to the other.
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 Kentish Town. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Kentish Town and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Kentish Town. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.