Kitchen Extensions Esher

With 57% of Esher's homes semi-detached or detached and 14% terraced, a kitchen extension here is more often a rear or wraparound addition to a semi or detached house than a terrace side return. Where it needs planning permission, Elmbridge judges it against the Design Code it adopted on 17 April 2024, which covers the depth test, the roof form and the plot ratio. Those are settled on paper before we price the steel, the drainage and the new kitchen as one programme.

For Esher, on London-derived ranges 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; Surrey work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Esher: 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 a single storey kitchen extension can go in Esher

The depth question in Esher has two answers, depending on whether you need planning permission. A house that keeps its permitted development rights can build a single storey rear extension within the national depth limits, or go further through the prior approval route for larger home extensions. Once an application is needed, Elmbridge's Design Code treats a single storey extension projecting no more than 3 metres as having minimal effect on a neighbour's light. Beyond that, it should sit below a 45 degree line from the edge of the nearest adjoining habitable room window.

That line is worth checking on site before the drawings are final, because a tall glazed wall or a raised parapet can push the roof above it. Where the neighbour's window is close, a lower eaves line, a hipped edge or a slightly shallower plan can keep the full width of the kitchen within the test. For a kitchen, the choice often decides whether the dining table sits inside the new room or stays in the old back room. It also changes the steel sizes and the ceiling height, so it is better made once, early.

Housing in Esher

Take the 3,110 or so homes the valuation list gives Esher: 26% flats, 74% houses, 20% from before 1919, 18% interwar and 60% post-war. A detached house in Esher can set its kitchen extension where the garden gets the best light, with the drain run the main limit on the footprint, and 45% of homes here are detached.

Roof form, balconies and glazing under Elmbridge's Design Code

Elmbridge's guidance says a house with a pitched roof should not have a flat-roofed extension, and the Design Code that replaced the older guides for applications submitted after 6 January 2025 repeats it. The Design Code adds that this may not apply to a single storey rear addition to a house of two or more storeys. A flat roof with a lantern on the rear kitchen of a two storey Esher house can still be argued. A single storey side extension does not fall within that exception, so the side leg of a wraparound is where a roof matching the pitch of the house is expected.

Elmbridge will not usually accept the flat roof of an extension as a balcony or raised terrace unless it is well screened or the plot is substantial, and permitted development does not cover a balcony in any case. Glazing has its own limit under Part L of the Building Regulations. A large area of sliding doors and roof glass has to be balanced by better insulation or other measures in the energy calculation. That is why the glass is fixed on the drawings before the steel is ordered, not added at the end.

Plot ratio, the side gap and the Design Code Checklist

Householder applications in Elmbridge now need a Design Code Checklist, and the Design Code asks applicants to state the proposed plot ratio and the plot ratio of every neighbouring plot that shares a boundary. It gives an indicative range of 0.2 to 0.3 for suburban residential areas and 0.1 to 0.2 for gated ones. On a wide Esher plot a wraparound kitchen can add a lot of footprint, so the designer checks the ratio before the plan is fixed, not after.

The Design Code also aims for at least 300mm between the side wall of a single storey extension and the boundary, because foundations and gutters built too close to it cause problems. That gap affects wraparound schemes most, since the side leg often runs close to a fence or a neighbour's garage. Digging near a neighbour's foundations can also bring in the Party Wall etc. Act, and the building owner, not the builder, serves any notice it requires before work starts.

London Clay, drainage and the steel into the house

Elmbridge's own appraisal states that the underlying geology of Esher is London Clay, with sandy upper levels known as the Claygate Beds. Clay moves as it wets and dries, and it reacts to tree roots. The foundation depth for a kitchen extension is therefore designed by the structural engineer we appoint and agreed with the building control surveyor once the trial hole is open. Mature trees near the back of a garden can push that depth down.

Opening the back of the house for a wide kitchen means a steel beam or goalpost frame carrying the rear wall and the floor above. The engineer sizes it, and we sequence the temporary props, the new drains and the soil stack moves so the house stays usable. Existing drains often run under the new floor, so a CCTV survey before digging shows whether they can be diverted or need an inspection chamber inside. Building over or near a shared public sewer needs the water company's agreement first.

• Building control inspections from footings to completion
• Foundations, drainage and slab with the kitchen services cast in
• Wet underfloor heating laid in the new screed

VOA Council Tax stock of properties, March 2025, for Esher. Counts rounded by the VOA.

Plenty of Esher projects start with one job and grow, so it helps to see kitchen renovation in Esher, kitchen extensions in Surbiton, a wraparound kitchen-diner, the Party Wall Act on a boundary build, how we handle kitchen extensions across London and Getting Daylight Into a Deep Plan.

The GS Renovation Difference in Esher

We run the whole job in one programme: groundwork, drainage, steel, roof, glazing, then first fix services, plaster and the kitchen fit-out itself. You deal with one site lead from the first trial hole to the worktops going in, rather than a builder handing over a shell to a separate kitchen company. We work to the drawings, the consent and the building control approval your designer secures, and we give you a written programme so you know when the kitchen will be out of use.

• Screed left to dry before the kitchen floor finish goes down
• Drains surveyed by camera before the footprint is fixed
• One point of contact from first survey to handover

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.