Kitchen Extensions Finchley

A kitchen extension in Finchley has to suit two different house types: Victorian and Edwardian terraces and interwar semis. Terraced houses make up 16% of local homes and semi-detached or detached houses 25%, so a side return and a rear or wraparound addition both come up. With 59% of homes being flats, many enquiries start with what a flat can do at all. We build the shell, set the steel into the back wall, lay the drainage and fit the kitchen in the same programme.

In Finchley, 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 Finchley: 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.

Side return or wraparound on a Finchley house

The shape of the extension follows the house. On a Finchley terrace the spare ground is the narrow passage beside the back addition, so a side return fills it and turns a galley kitchen into a room wide enough for a table. On a semi the garden runs the full width of the plot, which suits a straight rear addition or an L that wraps into the side passage. Each choice moves the load onto a different wall, so it fixes where the steel lands before any cabinets are chosen.

A side return sits hard against the boundary, which puts the neighbour's wall, gutter and drain into the plan early and makes the party wall process something for you, as owner, to settle first. A wraparound carries a corner post or a longer beam where two new walls meet the old house. In either case the ceiling line, the rooflight positions and the height of the new floor are drawn together, because a step between the old kitchen floor and the new slab is the detail owners notice every day.

Housing in Finchley

Finchley's housing, as the Council Tax list records it, is about 19,250 homes: 41% houses, 59% flats, with 38% pre-1919, 26% interwar and 36% built since 1945. Most homes here are flats, and only a ground floor flat in Finchley with its own garden can extend its kitchen.

Finchley Garden Village rules for rear kitchen additions

In Finchley Garden Village the council's design guidance is specific about the back of the house. A single-storey rear extension should generally be no wider than half the rear elevation and of modest depth, its height kept to a minimum, and a flat roof will not be permitted. The village also has its own Article 4 Direction, introduced by Barnet Council in September 1979, so the usual householder freedoms are narrower here than on an ordinary street.

That shapes the kitchen before any builder prices it. A half-width addition with a pitched roof gives less floor area than a full-width box, so the layout has to earn its space: an island may give way to a peninsula, and the sink may stay in the original room. The guidance also notes that the original houses had no rooflights or dormers, so any roof glazing on the extension has to be justified on the drawings and the rear glazing does more of the work. Your designer draws to this guidance and we build to the approved drawings.

Windows, glazing and hidden elevations in Finchley conservation areas

Barnet expects a Finchley Garden Village extension that cannot be seen from the street to be detailed as carefully as one that can. Its guidance says extensions hidden from public view deserve the same considerations and attention to detail as highly visible ones. It also says windows in new extensions should match the originals in how they divide into opening and fixed lights. A wall of plain sliding glass is therefore a harder case here than a set of divided doors and windows sized to the existing pattern.

For the programme this means the joinery is a long lead item, ordered once the drawings are approved and before the slab goes down, so the openings are built to the frame sizes and not the other way round. In the Finchley Church End Conservation Area a separate Article 4(2) direction applies to named properties, including 9 and 10 College Terrace, 1 to 4 Park Cottages and 28 Hendon Lane. For those houses it covers any enlargement or alteration where any part would front a highway, waterway or open space, so check the list before treating a side addition as permitted development.

When a Finchley flat or a larger addition needs full planning

Householder permitted development applies to houses only, so a ground floor flat in Finchley has no allowance to extend its kitchen without a planning application. The lease will normally require the freeholder's consent as well, and the managing agent may want the structural drawings before signing. Barnet's guidance for the Garden Village also says two storey extensions are unlikely to be supported there, so plan a kitchen extension there as a single storey.

Near East Finchley, the Hampstead Garden Suburb Conservation Area adds a second approval: any extension needs consent from both Barnet Council and the Hampstead Garden Suburb Trust. The Suburb guidance says rear extensions should generally be no wider than half the rear elevation and, in most instances, less. Two consents mean two sets of comments on the drawings, so we plan the start date once both are in hand and not before.

• Building control inspections from footings to completion
• The kitchen itself fitted under the same contract as the build
• Hob gas supply altered by a Gas Safe registered engineer

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

Alongside kitchen extensions in Finchley, the pages that usually help next are kitchen renovation in Finchley, kitchen extensions across Barnet, fitting the kitchen itself, the Party Wall Act on a boundary build, our London kitchen extensions page and The Party Wall Act.

Why Finchley Homeowners Choose GS Renovation

A kitchen extension is two trades in one: the structural shell and the kitchen that goes inside it. We run both, so the drainage runs, the steel, the floor build-up and the kitchen layout are settled on one set of drawings and one programme. The structural engineer we appoint specifies the steel, a registered electrician certifies the wiring and a registered gas engineer connects a gas hob, and you deal with one team from the first opening in the wall to the last cabinet door.

• Old kitchen kept in use until the new shell is weathertight
• Screed left to dry before the kitchen floor finish goes down
• Building control applications and inspections coordinated for you

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.