Kitchen Extensions Oakwood

In Oakwood a kitchen extension generally starts from a 1930s semi or a post-war house, as the site describes the area's housing as post-war flats and houses with 1930s semis. VOA figures put 43% of homes in the semi-detached or detached group and 12% in terraces, so the likeliest job is a single storey rear kitchen across the back of a semi or detached house, sometimes turning the corner at the side. Enfield Council is the planning and building control authority, and we run the shell, steel, drainage and new kitchen as one programme.

In Oakwood, 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 Oakwood: 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.

What Enfield's DMD11 allows at the back of an Oakwood semi

Enfield's Policy DMD11 sets the envelope when a rear kitchen on an Oakwood semi goes through a planning application. A single storey extension to a semi-detached house must not go more than 3 metres deep beyond the original wall or more than 3 metres high. It also has to sit inside a 45-degree line from the neighbouring windows. Those three limits decide the room before the kitchen layout is drawn, so settle them with your designer first.

The height rule has a useful allowance. Criterion 2(a) lets a flat roofed single storey rear extension to a semi reach 3m to the eaves, with 3.3m to 3.5m to the top of a parapet wall. On site that parapet figure governs the roof build up: joists, insulation, deck and any lantern kerb all have to fit under it. We set out the finished roof level from the approved section before the walls go up, so nothing needs trimming at the end.

Housing in Oakwood

Around 3,450 homes make up Oakwood on the valuation list; 44% are flats and 56% houses, and 3% date from before 1919, 44% from between the wars and 52% from after 1945. 37% of homes here are semi-detached; a semi in Oakwood can take its kitchen extension across the back and round into the side passage, which leaves room for a utility behind the kitchen.

The neighbour's window and the 45 degree line in Oakwood

The 45 degree test can reshape a rear kitchen on a pair of Oakwood semis more than any depth limit does. DMD11 criterion 2b says a single storey extension should not cross a 45 degree line drawn from the mid-point of the nearest original ground floor window of the house next door. Where the neighbour's kitchen or dining window sits close to the shared boundary, that line can cut the corner off your plan.

Designers answer it in a few ways: a stepped or chamfered corner, a lower eaves on the boundary side, or a deeper section further from the neighbour. Each one changes the steel and the roof. A stepped corner means an extra post and a more complex flashing detail, and a sloping roof on the boundary side changes how rainwater reaches the gutter. We price from the approved drawing so those details are in the programme, not discovered later.

Permitted development on Oakwood houses, and why flats are different

Some Oakwood houses can take a rear kitchen under national permitted development rather than a planning application. A single storey rear extension may go up to four metres beyond the original rear wall of a detached house, or three metres on any other house, and no higher than four metres. The eaves limit is lower close to a boundary. Your designer or agent confirms the route, and a lawful development certificate is worth having. We build to those drawings, with building regulations approval in place.

Flats are the exception, and they matter here because VOA counts 44% of Oakwood homes as flats. Householder permitted development applies to houses only, not to flats or maisonettes. A ground floor flat owner who wants a bigger kitchen needs planning permission and normally the freeholder's consent under the lease too. In a flat, the realistic kitchen project is often an internal reconfiguration within the existing walls rather than new floor area.

Drainage, steel and the kitchen fit-out on an Oakwood semi

A rear kitchen on a 1930s semi often meets the drainage run behind the house. We have a CCTV survey done early, because a manhole or shared run under the new floor has to be relocated or built over with the water company's agreement, and the route for the new sink and appliance waste follows from it. That decision fixes where the sink can go, so it comes before the kitchen design is finished.

Opening the back wall of the house needs steel sized by the structural engineer we appoint, with padstones at each end and temporary props while the old wall comes out. Where a padstone bears on the party wall, you as building owner serve notice under the Party Wall Act first. We then close in with roof lights and glazing, get the building control inspections done at each stage, and move straight into first fix plumbing and electrics, plastering, flooring and the kitchen units.

• Utility rooms and larders at the back of the extension
• Island units with power and waste run through the slab
• Flat roofs with rooflights or a roof lantern over the kitchen

VOA Council Tax stock of properties, March 2025, for Oakwood Park & Highlands. Counts rounded by the VOA.

If this is your first project in Oakwood, these are worth a look: kitchen renovation in Oakwood, kitchen extensions across Enfield, a wraparound kitchen-diner, party wall notices for a kitchen extension, our London kitchen extensions page and Utility Rooms and Their Cost.

Trusted Kitchen Extensions in Oakwood

An Oakwood kitchen extension touches planning, structure, drainage and the kitchen itself, and each depends on the one before. We work from your approved drawings, appoint the structural engineer for the steel, arrange the drainage survey and building control inspections, and carry the job through to the finished kitchen with one programme and one point of contact. You get a written quotation and a start date, and you deal with one firm instead of coordinating separate trades.

• Photographs kept at each stage for your records
• Drains surveyed by camera before the footprint is fixed
• Kitchen layout agreed before the foundations, so the services land in the right place

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.