Kitchen Extensions Bexleyheath

A kitchen extension in Bexleyheath is, for the bulk of the stock, a job on a house with a garden: 50% of homes here are semi-detached or detached and 17% are terraced. On an interwar semi, the house type the site describes as typical here, the brief is a single-storey rear or wraparound kitchen, with steel over a new opening in the old back wall and the kitchen fitted in the same programme. Bexley's Design Guide SPD Part 2 sets the depth and height its planners look for, and we build to the drawings you get approved.

In Bexleyheath, 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 Bexleyheath: 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 the interwar semis around Danson Park take at the back

On an interwar semi in Bexleyheath the kitchen extension goes across the back of the house, or wraps into the side passage beside it. Under national permitted development rules a single-storey rear extension on a semi can reach three metres beyond the original rear wall, and no more than four metres high. With prior approval, and outside designated land, that limit rises to six metres for a semi and eight metres for a detached house. The word original matters: an earlier lean-to or conservatory counts against the allowance, so we measure from the wall the house was built with.

The 17% of Bexleyheath homes that are terraced get a different shape: a side return infill along the narrow passage, where the house has one, often joined to a short rear extension. On a terrace the standard permitted development depth is three metres, as on a semi, or six with prior approval. Only a detached house gets four metres, or eight with prior approval. Whichever house you have, the sequence is the same: foundations, drainage, the steel over the opening in the old back wall, the shell and roof, then first fix, plaster and the kitchen fit-out.

Housing in Bexleyheath

The Council Tax list puts Bexleyheath at about 8,550 homes, 27% flats against 73% houses; 19% went up before 1919, 40% between the wars and 41% after 1945. 41% of homes here are semi-detached; a semi in Bexleyheath can take its kitchen extension across the back and round into the side passage, which leaves room for a utility behind the kitchen.

Bexley's Design Guide limits on depth and height in Bexleyheath

Where your kitchen extension needs planning permission in Bexleyheath, the drawings are judged against Bexley's Design Guide SPD Part 2, adopted on 29 June 2026. It says an extension to a terraced or semi-detached house should typically not exceed 3.5m deep, and a single-storey extension should not exceed 4m at its highest point, with eaves no higher than 3m. Those are design parameters, not a promise of approval, and your designer draws to them before anything is submitted.

A wraparound kitchen, which joins a rear extension to an infill down the side, is assessed on the same terms. The guide says single-storey wraparound extensions must follow the parameters for single-storey rear extensions, so the side leg does not buy extra depth at the back. For the build that means the eaves line and parapet heights are fixed early, because a flat roof with a lantern and a pitched roof with roof lights reach different heights. We price and programme from the approved section drawing, so the height you were granted is the height we build.

Drains, steel and the building control route in Bexleyheath

The route through building control for a Bexleyheath kitchen extension turns on what sits under the garden. In Bexley a building notice cannot be used for building or extending over or within 3m of a drain, sewer or disposal main controlled by Thames Water. A rear extension can land close to the shared run that collects from the kitchen and bathroom, so the drainage survey comes before the application route is chosen, not after it.

A full plans application in Bexley generally needs a construction specification and, where it applies, structural calculations for steel beams. The steel for a kitchen extension is the beam that replaces the old rear wall, so the structural engineer we appoint sizes it and those calculations go into the pack. A building notice carries no formal approval of the plans, which is one more reason full plans suits a job with new steel and new drainage. Where Bexley is the building control body, it needs at least 48 hours notice before work starts on site.

Red House Lane, trees and the Bexleyheath plots that need more care

Bexleyheath includes the Red House Lane Conservation Area, designated on 25 July 1973. Its Article 4(2) Direction covers Nos 1-9 (odd) Red House Lane and No 44 Upton Road, and brings front porches and front boundaries under council control. For a rear kitchen the appraisal is the more useful document: it says further development might be permissible where proposals use current enclosed areas at ground floor level to the rear.

Two more checks apply on designated land. Under permitted development every side extension in a conservation area needs householder planning permission, so a wraparound there needs a householder planning application. Bexley states that trees in a conservation area are protected, as are trees under a Tree Preservation Order, which matters when new foundations run near a mature garden tree. We set out the footings only after the tree advice and the consent are in hand, and we keep the excavation to the approved line.

• Wet underfloor heating laid in the new screed
• New kitchen circuits, with Part P certification from a registered electrician
• The kitchen itself fitted under the same contract as the build

VOA Council Tax stock of properties, March 2025, for Bexleyheath Broadway and Danson Park. Counts rounded by the VOA.

Alongside kitchen extensions in Bexleyheath, the pages that usually help next are kitchen renovation in Bexleyheath, kitchen extensions across Bexley, a wraparound kitchen-diner, how building control inspects an extension, our London kitchen extensions page and Renovating a Victorian Terrace.

Why Choose GS Renovation in Bexleyheath

You get one firm for the shell and the kitchen. We work from the drawings and the calculations from the structural engineer we appoint, set the programme around the drainage and the steel, and keep the fit-out in the same sequence, so the room is not handed between trades. For a Bexleyheath semi that means one point of contact from the first dig to the worktops. You receive a written quotation after a survey, and we give your designer the build sequence so the application and the programme line up.

• Our own trades on site rather than a chain of subcontractors
• Drains surveyed by camera before the footprint is fixed
• New floor level matched to the existing house, with no step at the opening

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.