House Extensions Esher
Single storey rear and double storey extensions in Esher, planning, structure and build under one contract.
- Rated 4.9 from 31 reviews on MyBuilder
- Guide from £40,000 (London-derived)
- Free site survey, itemised quote
An extension in Esher is a planning job before it is a building job. Elmbridge now assesses householder applications against its Design Code, with a checklist, a stated plot ratio and numerical tests on a neighbour's light. We build to the drawings your architect gets approved, appoint the structural engineer for the foundations and openings, and coordinate the building control inspections.
For Esher, on London-derived ranges a single-storey rear extension typically starts from £40,000, or £2,000 to £2,800 per m²; 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 structure, we build it, and building control signs it off.
Price guide
| Work | Indicative range |
|---|---|
| Single-storey rear extension | from £40,000 |
| Rear extension, per m² | £2,000 to £2,800 |
| Side return, per m² | £2,400 to £3,200 |
| Wraparound, per m² | £2,400 to £3,200 |
| Double storey, per m² | £1,800 to £2,600 |
| Basement extension | see the basement page |
Indicative London ranges (Architecture for London, Resi, MyBuilder and Checkatrade, 2026), not a quotation. Surrey work generally runs below the London figures; your price follows a site visit. Prices checked September 2026. Full breakdown: Extension Costs & Planning.
Quick estimate for Esher
Esher range: choose above
The Design Code that now governs extension applications
Elmbridge adopted its Design Code as a supplementary planning document on 17 April 2024. It replaces the council's Design and Character SPD for all planning applications submitted after 6 January 2025. A Design Code Checklist must be submitted as a supporting document with householder planning applications. Elmbridge also requires applicants to state the proposed plot ratio and the plot ratio of every neighbouring plot that shares a boundary with the site. The Design Code gives an indicative plot ratio range of 0.2 to 0.3 for suburban residential areas. The council's Esher character assessment states that the analysis of character and context should be an integral part of a Design and Access Statement.
The council also applies numerical tests to a neighbour's daylight. Beyond 3 metres, Elmbridge expects an extension to sit below a 45 degree line taken from the edge of the nearest adjoining habitable room window. It applies that test to single storey extensions within 8 metres of a neighbour's window, unless they project no more than 3 metres. It applies the same test to two storey extensions closer than 15 metres to a neighbour's window, measured along that sight line. Elmbridge asks for a minimum of 1 metre between any extension above ground floor level and the site boundary, and aims for at least 300mm between the side wall of a single storey extension and the boundary. Those two figures shape a double storey or side extension in Esher more than anything else: the 1 metre gap to the boundary above ground floor, and the 15 metre sight line to the neighbour's window.
Housing in Esher
Around 3,110 homes make up Esher on the valuation list; 26% are flats and 74% houses, and 20% date from before 1919, 18% from between the wars and 60% from after 1945. A detached house in Esher often extends far enough from the boundary that no party wall notice is needed, and 45% of homes here are detached.
Which parts of Esher sit in a conservation area
Three of Elmbridge's conservation areas lie in Esher: Esher, West End and Lakeside Drive. The Esher Conservation Area was designated on 31 July 1973 by Surrey County Council. Elmbridge extended it on 21 June 1983 to take in Clive Road and the adjacent properties on the High Street. The West End Conservation Area was designated on 25 April 1977, and the Lakeside Drive Conservation Area on 26 November 2013.
The 2008 additions to the Esher Conservation Area took in 53 to 65 High Street (odd numbers), 1 to 46 Wolsey Road and 1 to 17 Wolsey Grove. They also took in 1 to 11 Charlotte Mews, the public car park at Heather Place, and trees and public verges on Lammas Lane. Elmbridge's pages list no Article 4 direction covering any part of Esher, but check the council's current Article 4 list before relying on permitted development. Six weeks written notice must be given to Elmbridge before lopping or felling a tree greater than 100mm in diameter, measured 1.5 metres above the ground, within a conservation area.
Clive Road, where Elmbridge has published what it likes and dislikes
Elmbridge describes Clive Road, which lies inside the Esher Conservation Area, as of exceptional architectural quality. The Esher appraisal criticises the side extension at number 11 Clive Road, which reveals an incongruously large roof in views up the road. It praises the extension to number 28 for achieving a close match with the original house in materials and detailing, with an added hipped roof that improved the composition.
That is a direct statement of what the council wants from an extension. The Elmbridge Design Code states that the materials and detailing of an extension should match those of the existing building in design, colour and texture. On site that means sourcing brick, mortar colour and roof tile to match, and sampling them before they are laid. We build to the approved drawings and agree the samples with you in advance.
The ground under an Esher extension
Foundation depth is set by what is under your plot, and the published sources do not agree. British Geological Survey 1:50,000 mapping records the bedrock beneath Esher town centre and the conservation area as the Bagshot Formation, sand, part of the Bracklesham Group, of Eocene age, with no superficial deposits mapped over it. The same mapping records the bedrock beneath Claremont Park and Clare Hill as the Bagshot Formation, sand, the same unit that underlies the town centre. Elmbridge's own conservation area appraisal states that the underlying geology of Esher is London Clay.
Nearer the railway the mapping changes. It records river terrace sand and gravel of the Kempton Park Gravel Member as superficial cover around Esher station and the eastern end of Lower Green Road. It records alluvium, a mix of clay, silt, sand and peat, along Lower Green Road itself, west and north of that gravel. Those are different bearing conditions, so a trial hole on your plot settles the depth and the engineer specifies from it.
Kitchen extensions in Esher
77% of the houses in Esher are semi-detached or detached, which usually leaves room for a kitchen extension across the full rear width, with a steel beam over the opening into the house. The fit-out is priced on its own page, kitchen renovation in Esher; the build figures are in the table above.
Side return extensions in Esher
Side returns belong to the older terraces, and only 14% of homes in Esher are terraced houses, so they are the exception here; on a semi-detached or detached house a full-width rear extension or a side extension usually does the job. Our side return extension page covers the build in detail, with build rates of £2,400 to £3,200 per m².
Double storey extensions in Esher
Under permitted development a two-storey rear extension can go no more than 3 metres beyond the original rear wall and must stay at least 7 metres from the rear boundary, and in a conservation area it is not permitted development at all. Many gardens are too short for the 7 metre rule, so a double storey extension in Esher often needs planning permission from Elmbridge Borough Council. With 57% of homes here semi-detached or detached, the side of the house is often an option too. Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.
- Brickwork and mortar matched to the existing elevation
- Party wall process explained, and the extension built to the award
- Flat and pitched roofs with rooflights or lanterns
VOA Council Tax stock of properties, March 2025, for Esher. Counts rounded by the VOA.
Trusted House Extensions in Esher
An extension has several consents running in parallel: planning permission, building regulations and, on some plots, tree and flood requirements. We build to the drawings your architect gets approved rather than designing round them, appoint the structural engineer for the foundations, beams and openings, and coordinate the building control application and inspections. Materials are sampled and agreed before they are laid, which is what the Design Code's matching requirement comes down to on site. One point of contact from the first survey to the completion certificate. Fully insured, registered in England, company number 14611254, rated 4.9 from 31 reviews on MyBuilder.
- Drainage diverted or built over with the right approval in place
- Aftercare and snagging support once the job is finished
- Weathertight shell reached before the fit-out begins
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
FAQ
Frequently Asked Questions about House Extensions Esher
How does your house extensions price in Esher compare with a national firm's?
Against a national firm, a GS Renovation quotation for house extensions in Esher is more transparent: every line within £2,000 to £2,800 per m² for a rear extension (London-derived) is visible, including the engineer's design and the Elmbridge Building Control Services fee. National pricing tends to be a rate per square metre for a KT10 address nobody has visited, which misses that the width of the opening into the house decides the steel.
What plot ratio does Elmbridge expect on a gated road south of Esher?
A lower one than in the centre of the town. For gated residential areas the Design Code puts the indicative plot ratio at 0.1 to 0.2. It places low density residential neighbourhoods with floor area ratios of 0.0 to 0.4 south of Esher. It also names Esher among the centres where a floor area ratio above 1.0 is found, alongside Walton on Thames and Weybridge. Which figure your plot is judged against depends on where it sits.
Does a rear extension in Esher need a flood risk assessment?
Only where the site is in Flood Zone 2, or in an area of medium to high surface water flood risk. Elmbridge adopted its Flood Risk supplementary planning document on 3 May 2016, and it includes a flood risk assessment template for small scale development including householder extensions. Your agent checks the flood zone before the drawings are finished. Where the template applies, it is submitted with the householder application rather than sent later.
Does an extension on Clare Hill have to keep to the estate's building line?
Elmbridge treats the building line as part of what holds that estate together, so a scheme that breaks it needs a reason the council will accept. The houses on the Claremont Park and Clare Hill estate were designed and overseen by a single architect, Blair Imrie, and standard plot ratios and building lines still link the development together. The council also cites the estate's low density and its established covenants when it limits development there.
The house is unlisted but the appraisal calls it a positive contributor. Does that raise the bar?
Yes, in the sense that the effect on the conservation area becomes part of the planning judgement. The Esher appraisal identifies 147 unlisted buildings that make a positive contribution to the character or appearance of the conservation area. Being on that list carries no separate consent of its own. It shapes what a planning officer expects from the design, particularly where the extension is visible from the street rather than tucked behind the house.
Does taking down the front boundary wall for access need its own permission?
It can, where the house sits inside a conservation area, so the question goes on the application rather than being settled on site. Houses on Park Road sit very close to the pavement, with tiny front gardens enclosed by low brick walls, and those walls are part of what the appraisal describes. Where a wall comes down for access and goes back afterwards, agree the rebuild detail and the brick with your agent beforehand.
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