Kitchen Extensions Barnet

In Barnet, 30% of homes are semi-detached or detached and 18% are terraced houses, and those houses are where a kitchen extension gets built. The housing here runs from 1930s semis to period houses and substantial suburban homes, and each of those takes the new kitchen differently. We build the shell, put the steel into the back of the house, run the drainage and finish the kitchen itself in one programme, so the room you cook in is ready when the builders leave.

In Barnet, a rear kitchen extension of about 30 square metres typically costs £45,000 to £97,500 excluding VAT, or £60,000 to £100,000 for a side return (indicative London ranges, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Barnet: the structural engineer we appoint designs the foundations and steel, we build the room and fit the kitchen, and a registered electrician certifies the electrics.

Which kitchen extension suits a Barnet semi or terrace

On a Barnet semi the useful space is across the back, sometimes wrapping round into the side passage, while a terrace gains its room from a side return. The VOA figures put semi-detached and detached homes at 30% of the stock and terraced houses at 18%, so the rear or wraparound addition to a semi is a common Barnet brief. The choice decides where the new opening goes, how long the steel spans and whether the side wall of the house needs picking up as well as the rear wall.

A side return on a terrace is narrower and leans on the boundary, so the party wall and the neighbour's drainage come into the conversation early. A wraparound on a semi carries a corner post or a longer beam where the two new walls meet the house. Both change where the kitchen units can go, because a steel post or a downstand beam fixes the line of the island and the run of wall cabinets before the kitchen designer has drawn a single door.

Housing in Barnet

Barnet has about 160,480 homes on the Council Tax list: 20% pre-1919, 34% interwar and 46% post-war, with flats making up 50% and houses 50%. Where many homes are flats, a kitchen extension to a flat in Barnet is possible only on the ground floor, with a garden of its own, planning permission and the freeholder's written consent.

Permitted development limits for a kitchen extension in Barnet

Permitted development lets a house add a single-storey rear extension without a planning application, within set limits. Nationally the rear projection is capped at four metres beyond the original rear wall of a detached house and three metres for any other house, which covers every semi and terrace. With prior approval, and outside designated land, those limits rise to eight metres and six metres respectively. The original rear wall matters: if an earlier owner has already built out, that earlier addition eats into what is left.

Side additions are different. On designated land, such as a conservation area, every side extension needs householder planning permission, so in any of Barnet's conservation areas the side leg of a wraparound triggers an application. Flats and maisonettes have no householder permitted development rights at all, so a ground floor flat owner extending the kitchen needs planning permission and, under most leases, the freeholder's consent. Your designer or agent makes the application; we price and programme against the approved drawings.

Rules in Finchley Garden Village and Hampstead Garden Suburb

Two Barnet conservation areas have guidance limiting the width of a rear extension to protect the original back of the house. The Finchley Garden Village Design Guidance says single-storey rear extensions should generally not be wider than half the width of the rear elevation and should be of a modest depth. It keeps the height to a minimum and rules out flat roofs. It also notes the original houses had no dormers or rooflights, so any roof glazing on the new kitchen roof needs to be shown and justified on the drawings.

In Hampstead Garden Suburb Conservation Area an extension needs consent from both Barnet Council and the Hampstead Garden Suburb Trust. The Suburb's own guidance says rear extensions should generally not be wider than half the rear elevation and in most instances less. That narrower footprint pushes the kitchen layout towards a galley or an L rather than a broad open room. We set out the units, the glazing and the roof pitch to suit the width actually consented.

Monken Hadley and The Burroughs: smaller, subordinate kitchen additions

Around Hadley and Hendon the guidance asks for extensions that stay visibly secondary to the house. In Monken Hadley Conservation Area the council says extensions should normally be subordinate to the main building. Large extensions that change the character of the house are highly unlikely to get permission, and careful design applies to the rear as well as the front. A kitchen extension there may end up as a modest garden room with the kitchen reorganised inside the original footprint.

Some addresses in Hendon The Burroughs Conservation Area in Barnet sit under an Article 4 direction, which covers 1-8 Burroughs Gardens and 63-77 (odd) The Burroughs. It removes permitted development rights for enlarging, improving or altering the house and for roof alterations. On those addresses even a small rear kitchen addition goes through a planning application first. We match brick, bond and roof covering to the existing house so the new work reads as part of it, which is what these consents expect.

• Boiler relocation and flue changes on the enclosed rear wall
• Rear, side return and wraparound kitchen extensions
• Foundations, drainage and slab with the kitchen services cast in

VOA Council Tax stock of properties, March 2025, for all 42 statistical areas in Barnet. Counts rounded by the VOA.

Work in Barnet rarely sits on its own, so you may also want kitchen renovation in Barnet, our Barnet area guide, builders in Barnet, the Party Wall Act on a boundary build, kitchen extensions anywhere in London and Side Return or Rear Extension.

The GS Renovation Difference in Barnet

We run a kitchen extension as one job from footings to worktops, so the same team that digs the foundations fits the units and tiles the splashback. The structural engineer we appoint designs the steel, building control inspects each stage, and a registered electrician certifies the wiring while an engineer on the Gas Safe Register handles any gas work. You get one programme with the drainage, glazing, roof and kitchen fit-out in sequence, and one point of contact from strip-out to handover.

• Aftercare and snagging support once the job is finished
• Building control and Part P certificates handed over together at the end
• One contract for the groundworks, the steel and the kitchen fit

Reviewed jobs near Barnet

2 MyBuilder reviews from Barnet, with each customer's own job title:

• Install new kitchen, Barnet, 15 Apr 2022 (5 out of 5)
• Bathroom Refurbishment, Barnet, 14 Oct 2021 (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.