Kitchen Extensions Sidcup

A kitchen extension in Sidcup is typically planned for a 1930s or post-war semi or detached house, the housing the area is known for, as a single-storey rear addition or, where the plot allows, a side and rear wraparound. Where planning permission is needed, Bexley tests its depth, height and eaves against the Design Guide SPD Part 2 it adopted on 29 June 2026. We build the shell, the steel into the house and the drainage, then fit the kitchen in the same programme, with one team from ground works to worktops.

In Sidcup, 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 Sidcup: 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 and how tall a Sidcup kitchen extension can go

For a planning application, Bexley's Design Guide SPD Part 2, adopted on 29 June 2026, says an extension to a terraced or semi-detached house should typically not exceed 3.5m deep. It adds that a single-storey extension should not exceed 4m at its highest point, with eaves no higher than 3m. These are borough-wide design figures, so on a Sidcup semi the designer draws to them first and the kitchen layout follows the footprint, not the other way round.

In practice that means a Sidcup semi gains a kitchen and dining space across the back of the house rather than a very long room. A roof that stays under the eaves figure tends to be a flat roof with a lantern or a shallow mono pitch. Foundations dug close to the attached neighbour can bring the Party Wall Act into play, and serving notice is your duty as building owner, not ours. We price the roof build-up, the glazing and the kitchen as one package once the drawings fix the envelope.

Housing in Sidcup

Sidcup has about 15,110 homes on the Council Tax list: 12% pre-1919, 30% interwar and 57% post-war, with flats making up 40% and houses 60%. 27% of homes here are semi-detached; a semi in Sidcup can take its kitchen extension across the back and round into the side passage, which leaves room for a utility behind the kitchen.

Wraparound and permitted development routes for Sidcup houses

A wraparound in Sidcup is treated as a rear extension for design purposes: Bexley's guidance says single-storey wraparound extensions must follow the same parameters as single-storey rear extensions. So the side infill does not buy extra depth at the back. Where a detached or semi-detached house has a wide side passage, the wraparound widens the kitchen instead of lengthening it, which suits a galley that needs to become a room with an island.

Some Sidcup owners look at permitted development instead, which applies to houses only. Nationally a single-storey rear extension can go up to three metres beyond the original rear wall of a semi or terrace, or four metres on a detached house, and no higher than four metres. With prior approval and outside designated land the limit rises to six or eight metres. Building Regulations apply on either route, and we build to the drawings your designer has had confirmed.

Drains, steel and building control on a Sidcup kitchen job

A new kitchen at the back of a Sidcup house can sit over or close to the run that carries the house drains to the sewer. In Bexley a building notice cannot be used for an extension built over or within 3m of an existing drain, sewer or disposal main controlled by Thames Water, so those jobs go through full plans or a registered building control approver. Building over a public sewer also needs Thames Water's own consent, which is separate. We survey the drainage early so the route and any diversion are known before the programme is fixed.

A full plans application in Bexley generally needs a construction specification and, where applicable, structural calculations for steel beams. That is where the steel into the house comes in: opening the back wall to the new kitchen needs a beam sized by the structural engineer we appoint. Bexley checks full plans and issues a decision within five to eight weeks, which we plan around so the ground works start once approval is in hand.

Old Forge Way and the Sidcup conservation areas

Parts of Sidcup carry extra controls that change what a kitchen extension can look like. The Old Forge Way Conservation Area has an Article 4(2) Direction that brings minor alterations, including enlargements or improvements to the exterior of a dwelling, within council control. On that estate even a modest addition needs checking with Bexley before the design is settled, and the finish will be judged against the style of the estate.

Bexley's published list of conservation areas also includes The Green, Sidcup and Halfway Street, Sidcup, and Sidcup has the Christ Church Conservation Area, designated on 19 February 1993, and The Oval, designated on 19 February 1992. Under national rules, all side extensions on designated land such as a conservation area need householder planning permission, so a wraparound there cannot rely on permitted development. We order matching brick and roof finishes early in these streets.

• Drain diversions and build over agreements with the water company
• Kitchen-diner layouts planned before the foundations
• Floor levels matched through the old opening

VOA Council Tax stock of properties, March 2025, for Sidcup West, Sidcup East, Lamorbey and Foots Cray Meadows. Counts rounded by the VOA.

For the wider picture around kitchen extensions in Sidcup, see kitchen renovation in Sidcup, kitchen extensions across Bexley, a wraparound kitchen-diner, the Party Wall Act on a boundary build, kitchen extensions across London and Side Return or Rear Extension.

Why Choose GS Renovation in Sidcup

We take a Sidcup kitchen extension from ground works through to the fitted kitchen, so you deal with one team rather than a builder followed by a separate kitchen fitter. The founder has more than three decades of hands-on building experience. We appoint the structural engineer for the steel, work from the drawings your designer prepares, set out a written programme before starting, and give a written quote after a site visit. The kitchen layout is agreed while the shell is still being drawn, so services arrive where the units need them.

• Rooflights set out against the engineer's steel layout
• Registered in England, Companies House no. 14611254
• Cooker extract taken outside through the new roof or flank wall, not recirculated

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.