Kitchen Extensions Southgate

A kitchen extension in Southgate starts from the house type, and there are more semis here than terraces. Semi-detached and detached houses make up 34% of homes here and terraces 18%. With 42% of homes dating from 1919 to 1939, a common job is a flat roofed rear addition across the back of an interwar semi, sometimes wrapping into the side passage. Enfield Council judges these against its own extension policy, with depth, height and a 45-degree line from next door setting the envelope. We build to the drawings you have approved and fit the kitchen in the same programme.

In Southgate, 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 Southgate: 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.

How deep a Southgate semi can go at the back

Under Enfield Council's own policy, a single storey extension to a semi-detached house should stay within 3 metres of the original rear wall and 3 metres in height, and inside a 45-degree line from the neighbour's nearest original ground floor window. That is the planning test when you apply for permission. The depth matches the basic permitted development limit for a semi, but the height is lower than the permitted development cap of four metres, and far short of the six metres prior approval can allow.

The original rear wall matters more than the one you see today. If a Southgate house already carries a small lean-to or a later utility room, depth is counted from the house as first built, not from the back of the addition. Before we price, we want to see the survey drawings with the original line marked, because a lean-to that has to come down changes the demolition, the foundations and the skip count.

Housing in Southgate

Southgate has around 7,360 homes on the Council Tax list: 41% post-war, 42% interwar and 18% predate 1919, with 48% flats and 53% houses. 28% of homes here are semi-detached; a semi in Southgate can take its kitchen extension across the back and round into the side passage, which leaves room for a utility behind the kitchen.

Permitted development on a Southgate house, and the flat exception

Permitted development lets a Southgate house extend at the rear without a planning application, up to three metres for a semi or terrace and four metres for a detached house, and no more than four metres high. With prior approval, and outside designated land, those depths rise to six and eight metres. The rights can be removed by an Article 4 direction or a condition on an earlier consent, so check first. Owners often obtain a lawful development certificate to confirm the position, and building regulations approval is needed either way.

Flats get none of this. Householder permitted development rules apply to houses only, so a ground floor flat in a converted Southgate house needs a full planning application for any rear kitchen extension, however modest. The landlord's consent under the lease is a separate step, and the garden may not even be part of the flat's demise. We can price from planning drawings, but we programme the start only once both consents are in writing.

Parapet heights and flat roofs on Southgate rear extensions

Enfield's policy allows a flat roofed rear extension to a semi to reach 3m at the eaves, with 3.3m to 3.5m to the top of a parapet wall. The 3m eaves figure is the one that limits the room inside: the floor, the roof joists, the insulation and the roof finish all have to fit beneath it, while the parapet allowance only covers the upstand around the edge. So the roof build-up is fixed on the drawings before the walls go up.

We set out the finished floor level first, tie it to the existing kitchen floor so there is no step, and work upward to the roof. A roof light on a raised kerb adds height of its own, so its top is checked against the approved section as well. Getting this right on paper saves a lowered ceiling on site, which is what happens when a height problem is found after the steel is in.

Southgate Green and the rules for side infills

If your house is in the Southgate Green Conservation Area, check the Article 4 position before anything else. Planning Data records the conservation area under the Enfield Borough Conservation Areas Article 4(1) Direction 2003, so ask Enfield which rights it removes for your address. A conservation area is designated land, where every side extension needs householder planning permission. A side infill that could be permitted development elsewhere in Southgate therefore needs an application here.

For the build itself, a conservation area usually means matching brick, careful choices on glazing frames seen from the street, and more time spent on the external finish. We source brick samples early and hold them against the old wall in daylight. The consent sets the materials, and we order to it rather than to what is quickest to get, which is a lead time worth planning for. Expect the samples, and any conditions on the consent, to be settled before we take the back wall down.

• The kitchen itself fitted under the same contract as the build
• Wet underfloor heating laid in the new screed
• Drain diversions and build over agreements with the water company

VOA Council Tax stock of properties, March 2025, for Southgate and Southgate Green. Counts rounded by the VOA.

Plenty of Southgate projects start with one job and grow, so it helps to see kitchen renovation in Southgate, kitchen extensions across Enfield, fitting the kitchen itself, sign-off by building control on a kitchen extension, kitchen extensions anywhere in London and The Party Wall Act.

Why Choose GS Renovation in Southgate

We handle the whole extension and the kitchen inside it as one job, so the drainage runs, the steel, the roof and the units are sequenced by one team rather than three. Before a start date is fixed you get a written programme that shows when the back wall opens, when the kitchen is out of use and when water and power come back. The structural engineer we appoint works from your drawings, and building control inspections are booked into the plan.

• Cooker extract taken outside through the new roof or flank wall, not recirculated
• One contract for the groundworks, the steel and the kitchen fit
• Honest updates if a date or a detail has to move

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.