Kitchen Extensions Kingston

A kitchen extension in Kingston upon Thames is shaped as much by the Residential Design SPD as by the house. The SPD keeps at least 50% of the rear garden in all cases, holds single storey rear extensions to around 3 to 3.5m deep, and caps the height at 3m for a flat roof. On the interwar houses and Victorian villas across the borough that means planning the room around those limits first, then the steel, drainage, glazing and the kitchen itself as one programme.

In Kingston upon Thames, 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 Kingston upon Thames: 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 SPD allows at the back of a Kingston upon Thames house

The Residential Design SPD sets the envelope before any design work starts. In Kingston upon Thames it says a single storey rear extension should generally not exceed 3 to 3.5m in depth, and that at least 50% of the rear garden should remain in all cases. On a short garden the second rule bites first, so we measure the plot on the first visit and check both figures against your drawings before we price the steel or the glazing.

Height follows the roof you choose. The SPD puts a flat roof at no more than 3m, a parapet at 3.3m and a pitched roof at 4m. A parapet gives a crisp line and hides the roof edge, while a pitched roof suits a villa with a slate main roof. Each option changes the ceiling inside, the fall to the drainage and how much light reaches the room behind, so we set them out side by side.

Housing in Kingston upon Thames

The Council Tax list puts Kingston upon Thames at about 70,440 homes, 42% flats against 59% houses; 21% went up before 1919, 34% between the wars and 45% after 1945. 26% of homes here are semi-detached; a semi in Kingston upon Thames can wrap its kitchen into the side passage.

Side extensions on Kingston upon Thames semis and detached houses

Semis and detached houses make up 37% of homes in Kingston upon Thames, and where one has a side passage, that strip can become part of the kitchen. The SPD says a single storey side extension should in general be no wider than 50% of the original house. It should also be set in at least 250mm from the boundary so the guttering stays off next door, and set back at least 500mm from the front wall.

Those three rules shape a wraparound. The side part ends up narrower than the full passage, and the set in leaves a strip you still need to reach for maintenance. We draw the gutter line and the boundary on the setting out plan, so the bricklayer and the roofer work to the same line. Where the plot falls away to one side, the SPD also asks for a shallower rear section where the neighbouring house sits lower, and we allow for that in the steel layout.

Permitted development, flats and conservation areas in Kingston upon Thames

Permitted development can cover a modest rear kitchen. Nationally a single storey rear extension can go 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. These rules apply to houses only. With flats at 42% of the borough's homes, a ground floor flat owner needs planning permission, and the lease will normally require the freeholder's consent too.

Designations change the route. Kingston upon Thames has 26 conservation areas, and Kingston lists an external alteration or extension among the works in them that need its approval, so check before assuming a rear kitchen is permitted development. Every side extension on designated land needs householder permission. Claremont Road Conservation Area, part of the Surbiton New Town begun in 1838, is one example. Your designer applies for the consent; we build to the approved drawings and conditions, and we flag anything on site that would drift from them.

Steel, drainage and roof glazing in a Kingston upon Thames extension

Opening the back wall is the structural core of the job. Kingston's building control charge schedule lists the removal or formation of an opening in a load-bearing wall as its own item. The structural engineer we appoint sizes the beam and padstones; we prop, break out and set the steel to that design, and the inspector sees it before it is boxed in. If a padstone goes into the party wall of a semi or terrace, you as building owner give the neighbour notice first, as Kingston's boundaries page reminds owners.

Drainage comes next. A rear kitchen can land over the run from the old scullery, so we trace it early and plan any diversion before the footings go in. Roof lights and a wide glazed opening bring light back to the middle room the extension darkens. We then fit the kitchen in the same programme, so the plumber and electrician first fix once and the units go onto walls that are dry and square.

• Sliding, bifold and steel-framed glazed doors to the garden
• Kitchen-diner layouts planned before the foundations
• Building control inspections from footings to completion

VOA Council Tax stock of properties, March 2025, for all 20 statistical areas in Kingston upon Thames. Counts rounded by the VOA.

For the wider picture around kitchen extensions in Kingston upon Thames, see kitchen renovation in Kingston upon Thames, our Kingston upon Thames area guide, a wraparound kitchen-diner, the Party Wall Act on a boundary build, our London kitchen extensions page and Steel-Framed Doors Guide.

The GS Renovation Difference in Kingston upon Thames

We run the build and the kitchen as one job, so there is one programme and one team answerable for the finish. We measure the garden and the side passage on the first visit and check the drawings against the plot before pricing. The structural engineer we appoint designs the steel, we set it, and we book each inspection stage so nothing gets covered too early. You get a written quotation after a survey visit and a programme you can plan around.

• Waste cleared as we go, not left piled up outside
• Rooflights set out against the engineer's steel layout
• 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.