Area guide · KT22
House Extensions in Oxshott (KT22)
Planning an extension in Oxshott? You are in one of the most valuable villages in the country: the average Oxshott sale runs to about £1.76 million, and the detached average sits near £2.35 million (Rightmove sold-price data). The Crown Estate's private roads wind among Scots pines on sandy heath, substantial modern classical mansions stand beside inter-war originals, and Oxshott Heath gives the village its green lungs. Almost nothing here is a small job. The commissions are basements, double-storey reworks and whole-house programmes, the natural Oxshott brief is a substantial one, and the biggest plots take it as far as owners choose. Elmbridge Borough Council is the planning authority, with green belt on the fringes, and on the private roads the estate's own expectations sit alongside the council's.
Live planning data
What gets approval in Oxshott
Elmbridge assesses Oxshott schemes against the same householder policies as the rest of the borough, but the context does the real work here. On plots this size the argument is rarely about squeezing space in; it is about demonstrating that a much larger house still reads as a composed whole among the pines. Our applications are led by elevation studies and landscape sections for that reason, the working method our luxury extensions service is built on.
On the Crown Estate roads a second audience matters. Estate expectations shape what neighbours and the community consider appropriate, and unadopted roads add practical obligations about access, verges and reinstatement. We fold both into the plan from day one, and where a plot touches the green belt fringes we run the proportionality numbers described in our green belt guide before committing to a footprint.
Decisions turn on the individual case, so the individual case is where our effort goes.
Local knowledge
The stock behind the pines
The Crown Estate. Private roads, sandy ground, generous set-backs. The houses take basements exceptionally well, and the commissions here regularly pair a lower-ground leisure floor with a full ground-floor rework.
Around Oxshott Heath. Homes bordering the heath enjoy the village's best backdrop, and schemes are composed so the tree line, not the architecture, keeps top billing. Full-height glazing to the rear does more for these houses than any amount of added ornament.
Steels Lane. A spine of substantial family houses in mixed styles, where two-storey rear additions and kitchen wings are the recurring work.
The inter-war originals. Beside the modern classical mansions stand the houses that built the village's reputation, and their owners often choose extension and reinvention over demolition: a whole-house programme that keeps the character and doubles the usefulness.
Every street is different. That's the point.
We design to Oxshott's stock and to what the council demonstrably approves — not to a template. A free site visit tells you what your house can take.
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What an extension costs in Oxshott in 2026
The specification ceiling in KT22 is the highest we price for, and the ranges below reflect construction to that standard, before VAT, professional fees and kitchen supply:
| Extension type | Typical Oxshott cost | On-site time | Usual planning route |
|---|---|---|---|
| Single-storey rear | £70,000 to £140,000 | 3 to 4 months | Often permitted development, estate expectations apply |
| Kitchen extension (incl. mid-range kitchen) | £85,000 to £165,000 | 3 to 5 months | As above |
| Wrap-around extension | £110,000 to £205,000 | 4 to 6 months | Full application |
| Double-storey rework | £120,000 to £260,000 | 5 to 8 months | Full application |
| Basement leisure level | Priced on design | 6 to 12 months | Full application |
| Whole-house programme | Priced on design | Phased programme | Design-led application |
Rate yourself at £3,800 to £6,000 per square metre here. The luxury extension cost guide explains how those figures assemble at the top of the market. After a free design visit the quote lands as one fixed, itemised document, and that is the figure we build to.
Permissions, handled
Planning, covenants and getting a site to run
Two consents to think about. Elmbridge grants the planning permission; the estate context governs how the scheme should present and how the site should behave. We design for both at once rather than retrofitting one to the other.
Unadopted roads change logistics. Deliveries, plant movements and road condition all need agreeing and protecting on private roads. Our site plans price reinstatement in from the start, which keeps neighbours onside and protects the road surface everyone shares and pays for.
PD exists, used carefully. Where rights survive we can run generous single-storey schemes as permitted development, always closed out with a Lawful Development Certificate.
The usual clocks. Householder decisions take around eight weeks at Elmbridge. Party Wall procedures apply to boundary and basement work, and £1,000 to £2,500 per neighbour is the right allowance where surveyors are appointed.
How it works
How it works
- Site visit. Free, unhurried, and focused on what the plot, the estate context and the ground will actually support.
- Design for house and estate. A scheme that satisfies Elmbridge and sits naturally on its road.
- Approvals in parallel. Planning, party wall and logistics agreements progressed together to protect the programme.
- Delivery. One fixed price, one senior team, immaculate handover.
Questions, answered
Oxshott extension FAQs
Does the Crown Estate have a say in my extension?
The council issues the permission, but estate expectations and covenant obligations on the private roads are real and worth respecting from the first sketch. We design and plan the site with them in view.
What do Oxshott projects usually cost?
Working figures run £3,800 to £6,000 per square metre in 2026. Double-storey reworks span £120,000 to £260,000, while basements and whole-house programmes are individually priced and generally sit far beyond £250,000.
Is Oxshott good ground for basements?
Among the best we work in. Sandy ground, big plots and values around £2.35 million for detached houses (Rightmove sold-price data) make a lower-ground floor one of the strongest moves available here.
How do unadopted roads affect the build?
They put road condition, access and reinstatement on the project's books. We agree the arrangements before mobilising, so the neighbours meet a well-run site rather than a nuisance.
Am I in the green belt?
Possibly, on the fringes of the village. If so, extension headroom is measured against the original house, and we quantify it before design starts rather than after.
How long should I expect end to end?
Design in weeks, an Elmbridge decision in about eight more, then five to eight months of construction for a double-storey scheme. Phased whole-house programmes are mapped out with honest dates in the quote.
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What clients say
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“Used The Extension Company for a loft conversion on our semi detached in Barnet and couldn't be happier. They explained what was possible at the first visit, sorted the planning side, and gave a fixed price with no surprises at the end.…” read the full review
“Really impressed with the entire project. The side extension and conservatory have been finished to a very high standard and the team made the process straight forward and stress-free. It’s transformed the space and added so much value, would definitely recommend.”
“Brilliant experience with the extension company, transparent from the word go. Completed a double story extension for me and I couldn’t be more pleased. Thank you”
“I got the extension company to do a bathroom refurb for us a January they done a great job they managed to fit in a large shower as well as a bath”
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