Kitchen Extensions Barnes

A kitchen extension in Barnes, SW13, starts from the house type. 33% of homes in Barnes are terraced houses and 19% are semi-detached or detached, so the choice runs from a side return infill behind a period terrace to a full-width or wraparound extension on a family semi. 48% of Barnes homes are flats, and a flat has no householder permitted development rights, so any extension to one needs planning permission first. We build the shell, the steel, the roof and the kitchen itself in one programme.

In Barnes, 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 Barnes: 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.

Side returns and rear extensions on Barnes terraces

On a Barnes terrace the kitchen extension fills the side return, the narrow strip beside the back addition, and can carry on past the rear wall to make a wraparound. Richmond's House Extensions SPD says a single storey extension is usually acceptable if it projects no further than 3m for a terraced house. That guidance shapes the plan: the extra width comes from the side infill, and the rear projection stays short unless the design makes a case for more. We measure the plot and the back addition on the first visit, so the designer starts from a depth that fits.

Where a Victorian infill goes deeper than the usual guidance, the SPD limits eaves height to 2.2m. On a Barnes terrace that keeps the wall on the boundary low, with the roof rising away from the neighbour, and building on or against that line needs a notice under the Party Wall Act, which the building owner serves. The low eaves line suits a sloping glazed roof or a pitched roof with roof lights. Inside, the ceiling is lowest where it meets the party wall, so the worktop run and wall cupboards are planned against that line. We agree the roof build-up early, because insulation depth, the gutter detail and the glazing all have to fit under that eaves height.

Housing in Barnes

Barnes has about 9,740 homes on the Council Tax list: 51% pre-1919, 17% interwar and 31% post-war, with flats making up 48% and houses 52%. 33% of homes here are terraced; a terrace kitchen extension in Barnes starts in a narrow side return.

Semis, detached houses and the permitted development route in Barnes

On a semi-detached or detached house in Barnes there is more choice: a full-width rear extension, a wraparound, or a side extension where the plot allows. Richmond's SPD gives 3.5m as the usual single storey depth for a semi and 4m for a detached house. National permitted development allows a single-storey rear extension of four metres beyond the original rear wall of a detached house, or three metres for any other house. The two sets of numbers are close but come from different regimes, and the drawings need to say which one the scheme relies on.

Relying on permitted development means measuring from the original rear wall, not the back of an earlier addition, and keeping the extension within four metres in height. A Barnes house may have been extended before, so the first job is working out what the original house was. If the scheme sits inside the limits, a lawful development certificate is the owner's way of recording that before work starts. If it sits outside, it needs householder planning, or prior approval for a deeper single storey rear extension away from designated land. Either way we build to the approved drawings and keep the engineer's details on site for the inspector.

Barnes Green, Laurel Road and kitchen extensions to flats

Barnes Green conservation area number 1 was designated on 14.01.1969. In Richmond conservation areas front and side extensions of one storey or more and two storey rear extensions need planning permission. Under national rules all side extensions on designated land such as a conservation area need householder planning permission, which takes a side return infill out of permitted development there. On Laurel Road in Barnes there is also an Article 4 Direction in conservation area CA1. Richmond lists extensions, new doors and new windows among the changes such directions can bring under permission, so the owner checks what the Laurel Road direction covers before design.

Flats are the other part of the Barnes picture. Householder permitted development rules for extensions apply to houses only and not to flats and maisonettes, so a ground floor flat that wants a kitchen extension needs planning permission. It normally needs the freeholder's consent under the lease too, before anything is drawn in detail. Richmond's SPD also warns against light pollution from excessive roof lights and glazed roofs, especially where a property is subdivided into flats, because the flats above look down onto the new roof. We plan the glazing, blinds and lighting with that in mind.

Steel, drainage and the kitchen fit-out in one Barnes programme

Opening the back of a Barnes house into a new kitchen extension means steel: a beam where the rear wall comes out, and often a second where the side wall of the back addition is removed. Where Richmond is the building control body, its inspection framework lists steel and timber beams as an additional inspection item, so the beams are seen before they are boxed in. We sequence the work so the steel goes in, is inspected and is then cased and plastered, rather than holding the job for a late visit. The structural engineer we appoint provides the calculations the inspector checks against.

Drainage in a Barnes extension often decides where the sink and dishwasher can go. A new kitchen at the back may sit over an existing drain run, which needs a survey and possibly a build-over arrangement with the water company before foundations are dug. Richmond building control, where it is the body used, asks for 2 days notice that you intend to commence works, which we build into the start date. Once the shell is watertight the same team moves on to first fix plumbing and electrics, plastering, flooring and the kitchen, so there is one programme and one point of contact from ground works to worktops.

• Party wall process explained, with drawings for your notices
• Utility rooms and larders at the back of the extension
• Sliding, bifold and steel-framed glazed doors to the garden

VOA Council Tax stock of properties, March 2025, for North Barnes and Mortlake & South Barnes. Counts rounded by the VOA.

Plenty of Barnes projects start with one job and grow, so it helps to see kitchen renovation in Barnes, kitchen extensions across Richmond upon Thames, fitting the kitchen itself, sign-off by building control on a kitchen extension, how we handle kitchen extensions across London and Bifold or Sliding Doors.

Why Choose GS Renovation in Barnes

GS Renovation is run by its founder and director, Abdelaaziz Saaid, who has spent his working life on the tools. On a Barnes kitchen extension one firm carries the job from the ground works through the steel, roof and glazing to the finished kitchen, working to the drawings and consents the owner's designer has obtained. You get a written programme before we start, the engineer's details and inspection dates are kept on site, and you are told in advance when water or power will be off. You deal with the same people from the first visit to handover.

• Drains surveyed by camera before the footprint is fixed
• Paperwork and certificates handed over for when you sell
• One contract for the groundworks, the steel and the kitchen fit

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.