House Extensions Edmonton

GS Renovation builds extensions across Edmonton to your designer's approved drawings, from single-storey rear additions to double-storey and wrap-around projects on the Victorian and Edwardian terraces of N9. We handle the groundworks, steelwork, roof and full fit-out, and tell you early whether the work is likely to be permitted development or need planning.

In Edmonton, a single-storey rear extension typically starts from £40,000, or £2,000 to £2,800 per m² (indicative London ranges, Architecture for London, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Edmonton: the structural engineer we appoint designs the structure, we build it, and building control signs it off.

Side-return and rear extensions in Edmonton

The classic Edmonton project fills in the side return, the narrow strip of yard alongside the original rear closet wing, to square off a cramped galley kitchen into a wide, open kitchen-diner. We dig and pour new foundations tied into the existing terrace, build the walls, and install a steel beam where the old external wall comes out so the upper floors stay supported. A glazed roof or rooflights then bring daylight deep into the plan.

Rear extensions push the ground floor out into the garden and suit the generous back plots on many N9 streets. We manage the groundworks, drainage diversions around existing manholes, the structural openings and the roof as one sequence. Because these terraces adjoin neighbours on both sides, a party wall notice is usually needed where we build up to or along the boundary. You serve it as building owner (or your surveyor does), and we raise it with you and supply the drawings before work starts.

Housing in Edmonton

By the valuation list's count, Edmonton holds about 18,850 homes, 51% houses and 49% flats; by age, 29% were built before 1919, 23% between the wars and 48% since 1945. 45% of homes here are terraced; a rear extension on a terrace in Edmonton digs foundations close to both neighbours, so notices to both are normal.

Rear extensions on attached Edmonton houses and the Mayor's levy

45% of homes in Edmonton are terraced houses and only 5% are semi-detached or detached, so an extension in Edmonton is far more likely to be built against a neighbour's house than to stand free. That matters for permitted development, which allows a shorter rear extension on an attached house than on a detached one. A scheme copied from a detached house elsewhere can fail on depth alone. It also means the rear garden is often reached only through the house, so the spoil from the footings, every block and the steel all travel through the hall unless a neighbour agrees temporary access.

Larger schemes also meet the Mayor's levy. Under the Mayor of London's MCIL2 charging schedule, Enfield is in Band 2 alongside Barnet, Brent, Bromley and Ealing, and Edmonton sits within the London Borough of Enfield. A householder extension big enough to fall within the levy can normally claim the residential extension exemption, but the claim must be made, and a commencement notice submitted, before work begins. Digging the first trench before that paperwork is filed can cost the exemption, so ask the architect to check the floor area early.

Planning and permitted development in Enfield

Not every Edmonton extension needs a planning application. Many single-storey rear extensions fall under permitted development if they stay within the size, height and boundary limits, though those rights can be restricted, so we always check the specific property first. Where a design goes beyond those limits, or where you want a double storey or a wrap-around, your architect or designer prepares and submits a full application to Enfield Council, and we build to the approved drawings.

Either route, the structure still needs building regulations approval, which is separate from planning and covers the foundations, beams, insulation, drainage and fire safety. We build to what Enfield Council approves, and flag at survey any detail on the drawings that will not build the way it is drawn. Getting the correct consents in place before the diggers arrive keeps the project legal and avoids costly changes once the walls are up.

Kitchen extensions in Edmonton

88% of the houses in Edmonton are terraced. On a terrace the kitchen extension is built out from the back, into the side return where the house has one or across the full rear width, and a steel beam takes the old back wall so the kitchen and the new room become one space. The fit-out is priced on its own page, kitchen renovation in Edmonton; the build figures are in the table above.

Double storey extensions in Edmonton

Under permitted development a two-storey rear extension can go no more than 3 metres beyond the original rear wall and must stay at least 7 metres from the rear boundary, and in a conservation area it is not permitted development at all. Many gardens are too short for the 7 metre rule, so a double storey extension in Edmonton often needs planning permission from Enfield Council. On the 45% of homes that are terraced, the neighbours' windows usually decide the depth. Planning Data gives the Church Street, Edmonton conservation area a designation date of 1970 (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.

• Drainage diversion and build-over agreements with the water authority
• Single and double storey extensions
• Bi-fold, sliding and French door openings to the garden

VOA Council Tax stock of properties, March 2025, for all 5 statistical areas in Edmonton. Counts rounded by the VOA.

Once the house extensions work in Edmonton is scoped, people usually go on to read RSJ and steel beam installation in Edmonton, house extensions across Enfield, wraparound extensions, party walls and extensions, our London house extensions page and Garage Conversion Cost.

Trusted House Extensions in Edmonton

Homeowners across Edmonton pick GS Renovation because one team takes the extension from first drawing to final coat. We advise honestly on permitted development versus a planning application to Enfield Council, programme the work around the party wall notices you serve on shared boundaries, and build to building regulations. Backed by our founder's 30+ years on the tools, you get sound foundations, correct steelwork and a tidy site in an occupied home.

• One point of contact from first survey to handover
• Insulation and thermal detailing to current regulations
• Weathertight shell reached before the fit-out begins

Reviewed jobs near Edmonton

1 MyBuilder review from Lower Edmonton, with each customer's own job title:

• Fit a new bathroom suite, Lower Edmonton, 19 May 2017 (5 out of 5)

Read all 31 on our reviews page.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.