Kitchen Extensions Lambeth

Across Lambeth a kitchen extension is mostly a job for the house owner, and houses are the minority: 77% of homes in the borough are flats and 23% are houses. Terraced houses account for 17% and semis or detached houses for 5%, so the house you are extending is far more likely to be a terrace, and the brief is usually a single storey addition at the back. Flat owners start from a different place, because householder permitted development rules cover houses only, so any flat extension begins with a planning application.

In Lambeth, 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 Lambeth: 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.

Infill, end or wrap-around on a Lambeth rear return

All three shapes can work on a Lambeth terrace, provided the extension stays subordinate to the house and does not harm a neighbour's amenity. That is the test the Lambeth Design Guide sets for single storey infill, end and wrap-around extensions to rear returns. An infill fills the passage beside the back addition, an end extension sits beyond it, and a wrap-around joins the two into an L-shaped kitchen that runs across the full width of the plot.

The wrap-around is where the guide draws a firmer line. It is acceptable in most circumstances, yet the guide says it will be resisted on heritage assets and on buildings in conservation areas. For a house on a designated street, that points the drawings towards an infill or an end extension from the outset. Getting that choice right before the drawings are done saves you redrawing, and it fixes where the steel, the drainage run and the new kitchen wall will go.

Housing in Lambeth

Around 148,600 homes make up Lambeth on the valuation list; 77% are flats and 23% houses, and 40% date from before 1919, 14% from between the wars and 46% from after 1945. Where most homes are flats, only a ground floor flat in Lambeth with its own garden can extend its kitchen.

Brick party walls, parapets and a mostly glazed side infill

Lambeth's Design Guide asks for the party wall of an infill or wrap-around to be built in brick, generally with a parapet, so that no gutter hangs over the neighbour's side. For us that means a masonry wall on or against the boundary, positioned as agreed under the Party Wall Act, a parapet capping and a box or internal gutter behind it that drains back onto your own land. It also means the party wall process with the neighbour belongs early in the programme, before the footings are dug.

The same guide says side infills should be mostly glazed so they stay visually lightweight, and that glazed extensions will normally be limited to single storey height at ground or semi-basement level at the rear. In practice the infill roof becomes a run of fixed glazing or large roof lights over the old passage. Building Regulations Part L also limits how much glass an extension can have unless the designer shows by calculation that it still performs. We order the glazing once the steel is fixed and measured, because frames made to the drawing rarely match an old Lambeth rear wall that has moved over the decades.

Conservation areas and Article 4 streets across the borough

Designation changes the paperwork before it changes the build. Lambeth has 62 conservation areas covering approximately 30% of the borough, so a good number of its streets are designated. National rules then say every side extension on such land needs householder planning permission. On those streets even a modest side return infill goes through a householder planning application rather than permitted development, so the programme has to allow for a decision before anything is ordered.

Some streets carry an extra layer. Stockwell Park, Hyde Farm and the Leigham Court Estate are among the conservation areas where Article 4 Directions cover external alterations, in whole or in part. On those roads, external changes such as replacement windows and doors can need planning permission where the direction covers that part of the house. Check your street against the published list before the designer settles the rear elevation, so the doors we fit are the doors that were approved.

The Kennington Conservation Area and single storey infills on heritage assets

Inside the Kennington Conservation Area a rear extension has to earn its place against the gardens behind the terrace. The conservation area statement says rear extensions are only likely to be acceptable where they would not harm the spatial character of the area. Expect a deep addition that fills the garden to be harder to justify than a compact infill that keeps the open backs of the houses readable from the upper windows.

Height is the other limit. On heritage assets, Lambeth's Local Plan wants an infill beside a closet wing or back addition kept to one storey in most cases, and more than 2,000 buildings here carry statutory listing. A listed house also needs listed building consent for the works. So on a listed or locally listed house, plan the kitchen around one storey of new structure, with the light coming through the roof rather than from a taller wall. That keeps the steel simpler too, because the new roof does not have to carry a room above.

• Hob gas supply altered by a Gas Safe registered engineer
• Rear, side return and wraparound kitchen extensions
• Kitchen-diner layouts planned before the foundations

VOA Council Tax stock of properties, March 2025, for all 35 statistical areas in Lambeth. Counts rounded by the VOA.

Next steps that tend to follow kitchen extensions in Lambeth: kitchen renovation in Lambeth, our Lambeth area guide, a side return kitchen infill, how building control inspects an extension, our London kitchen extensions page and Planning a Kitchen Island.

The GS Renovation Difference in Lambeth

We run a Lambeth kitchen extension as one job from the first dig to the last worktop, so the builder who opens up the back wall is the same firm that fits the units and tiles the splashback. The structural engineer we appoint sizes the steel, a registered electrician certifies the new circuits and a registered gas engineer moves any supply. You get one programme, one point of contact and a finished kitchen at the end, with the drawings and consent in hand before we start on site.

• Rated 4.9 from 31 reviews on MyBuilder
• Drains surveyed by camera before the footprint is fixed
• Rooflights set out against the engineer's steel layout

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.