House Extensions Haringey

GS Renovation builds extensions across Haringey, from side-return infills in Muswell Hill to rear extensions in Wood Green and Tottenham. We handle the groundworks, steelwork, roof and full fit-out as one accountable project in N4, N8, N10, N15, N17 and N22.

In Haringey, 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 Haringey: the structural engineer we appoint designs the structure, we build it, and building control signs it off.

Side-return and rear extensions in Haringey

The most popular extension on Haringey's terraces fills the side return, the narrow strip of yard beside the rear closet wing, to widen a cramped galley kitchen into a bright kitchen-diner. We dig and pour the foundations, tie the new structure into the existing solid-wall build, install the steel beams that carry the old rear wall, and finish with a flat or pitched roof and roof lights that pull daylight deep into the plan.

Wrap-around extensions combine the side return with a rear projection for families in N8 and N10 who want a genuine open-plan ground floor. On these tighter terraced plots we plan the drainage runs, the party wall interface and the tie-ins carefully, because there is little room for error between your house and the boundary. Every element, from groundworks to the final skirting, is handled by our own team. Many Haringey extensions are, in practice, kitchen extensions: the new space takes the kitchen, and the old closet-wing kitchen becomes a utility room or WC. That puts the drainage run and the extractor duct route into the extension design from the first survey, because the sink, dishwasher and hob all move with it.

Housing in Haringey

On the valuation list Haringey counts about 114,980 homes, 64% flats and 36% houses; 54% predate 1919, 11% are interwar and 35% post-war. Since most homes here are flats, a flat in Haringey has no householder permitted development rights, so extending one needs planning permission and the freeholder's consent.

Extending a Noel Park or conservation area house in Haringey

The Noel Park appraisal describes Noel Park Estate as a planned estate of approximately 2000 terraced properties in Wood Green, North London, and its design guidance is specific about the back of the house. It says rear extensions should not be built across the full width of the plot and should not usually extend more than three metres beyond the rear wall. That makes the full-width kitchen extension seen on other Haringey terraces hard to justify on the estate. The workable shape is a part-width addition, which leaves a choice of which side it sits on, and that choice then fixes where the kitchen, the steel and the new drain run go. Start the design from that footprint rather than trimming a larger scheme.

Across Haringey's conservation areas, Noel Park included, the general limits are tighter than elsewhere. In a Haringey conservation area, single-storey extensions that extend more than 3 metres beyond the back wall of a house, or 4 metres for a detached house, need planning permission, and any extension at the side of a house needs it too. A rear extension of more than one storey needs permission there as well. Semi-detached or detached houses are only 5% of Haringey homes, and only detached ones get the 4 metre figure, so on most streets 3 metres is the line. A side-return infill extends beyond a side wall, so in a conservation area it needs a planning application whatever its depth. Where an Article 4 direction covers extensions, as in Tower Gardens, even a shorter rear addition needs permission.

Permitted development or planning in Haringey

Many single storey rear extensions in Haringey fall under permitted development, meaning you can build within set size and height limits without a full planning application. But it is never automatic. Homes in a conservation area, flats, and anything beyond the permitted limits will need a planning application to Haringey Council, and larger rear projections may require the prior approval neighbour consultation route before you can start.

We assess your specific property early, because a terrace near Alexandra Palace or in one of Crouch End's conservation areas is treated differently from a house with full permitted development rights. Whichever path applies, the structural work still needs building control approval under the Building Regulations, and where the extension meets the shared party wall you serve the notice as building owner, and we programme the work around any award as part of the job.

Kitchen extensions in Haringey

64% of homes in Haringey are flats, and a flat has no householder permitted development, so a ground-floor flat's kitchen extension needs planning permission from Haringey Council and the freeholder's consent. Most kitchen extensions here are on the 36% of homes that are houses. The fit-out is priced on its own page, kitchen renovation in Haringey; the build figures are in the table above.

Double storey extensions in Haringey

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 Haringey often needs planning permission from Haringey Council. It is a job for the 36% of homes that are houses; a flat cannot add a storey this way. The London Borough of Haringey has 28 conservation areas (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.

• Drawings and the structural engineer's design coordinated for you
• Party wall process explained, and the extension built to the award
• Roof works and structural alterations at roof level

VOA Council Tax stock of properties, March 2025, for all 36 statistical areas in Haringey. Counts rounded by the VOA.

Before committing to house extensions in Haringey, it is worth looking at RSJ and steel beam installation in Haringey, our Haringey area guide, wraparound extensions, a garage conversion instead, house extensions anywhere in London and Basement Conversion Cost.

Why Choose GS Renovation in Haringey

Haringey homeowners choose GS Renovation because one team takes the extension from foundations to finish, so there is no gap between builder, roofer and fit-out trades. We advise honestly on whether your project is permitted development or needs a planning application, manage building control and plan around the party wall notices you serve, and draw on our founder's 30+ years of building extensions.

• Weathertight shell reached before the fit-out begins
• Permitted development checked before you pay for a planning application
• Straight advice on what is and is not worth spending money on

Reviewed jobs near Haringey

2 MyBuilder reviews from Wood Green and Hornsey, with each customer's own job title:

• New kitchen install moving plumbing, elecs, flooring, Wood Green, 19 Jan 2022 (5 out of 5)
• New Kitchen Assembly & Others for Interior Designer, Hornsey, 5 Jan 2022 (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.