Basement construction in Oxshott.
Chelsea · SW3 · Chelsea basement and extensionCompleted work, photograph
New basements under large Oxshott houses, with no council basement policy to plan around. Designed, engineered and built by one team.
What an Oxshott basement has to answer.
- No basement SPD
- Elmbridge judges a basement as an extension
- Green Belt, DM18
- Wholly underground, inside the footprint
- Birds Hill estate
- Byelaws from 2015 name basement extensions
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement conversion and construction in Oxshott KT22, under one contract. A basement runs £450 to £780 a sq ft, construction only. Call 020 7731 6841, and a budget estimate typically follows within seven days.
Oxshott is large detached houses set back in wooded plots. Part of it is the Birds Hill estate, long called the Crown Estate. A basement adds floor area without raising the roofline.
Elmbridge has no basement policy, SPD or impact assessment, and no depth limit. Outside the Green Belt, a basement is judged as an extension. Inside it, DM18 wants the room wholly underground and within the footprint. Design, neighbours, trees and drainage decide the rest.
Mature trees set the line of the dig, so root zones come first. Most Oxshott land is high ground, but the Mole and Rythe touch parts. Where groundwater is a risk, a hydrology report is needed. We check each plot against the flood maps before design starts.
We have not yet finished a project in Surrey. Our nearest new basement is a dig with a kitchen extension in Chelsea SW3. One team designs, prices and builds an Oxshott basement the same way.
What the council allows in Oxshott.
- Council
- Elmbridge Borough Council, which has no basement policy or SPD.
- Green Belt
- Policy DM18 wants a wholly underground room inside the existing footprint.
- Flood SPD
- Zone 3b bars basements, and Zones 2 and 3a bar bedrooms.
- Birds Hill estate
- Its 2015 byelaws cover basements, a deposit, hours and completion period.
- Designations
- Oxshott has no conservation area and no Article 4 direction.
Source: Elmbridge Development Management Plan 2015, Policy DM18, and Flood Risk SPD 2016. Read on 12 October 2026. Policies change, so we read them again for your address.
What a basement costs in Oxshott.
£450 to £780a sq ft, construction only. Our basement band.
£180k to £300kConverting an existing basement. A project total, from our 2026 cost guide.
£500k to £900k+Digging a new basement. A project total, from our 2026 cost guide.
These are two kinds of figure. The band is a rate per square foot, construction only.
The cost guide figures are whole project totals.
Fees, party wall costs, contingency and VAT sit outside them.
Open the calculatorThe 2026 cost guideBasement costs in full
What Oxshott owners ask about basements.
In Oxshott
- Every service in Weybridge, Cobham and Oxshott
- Basement swimming pools in Oxshott
- Basement gyms in Oxshott
- Basement cinema rooms in Oxshott
- Basement golf simulator rooms in Oxshott
Basements nearby
- Basement construction across London
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- Basement construction in Knightsbridge
- Basement construction in Belgravia
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- Basement construction in Weybridge
- Basement construction in Cobham
- Wimbledon
- Richmond, Twickenham and East Sheen
Further reading, from the journal
Does Oxshott have a basement planning policy?
No. Elmbridge has no basement policy and no basement SPD.
Green Belt sites follow DM18, and flood zones follow the Flood Risk SPD.
We read both against your plot first.
Do the Crown Estate byelaws in Oxshott cover a basement?
The Birds Hill estate company’s 2015 byelaws name basement extensions.
They set a deposit, working hours and a completion period.
We confirm the current terms and any consent step for your plot.
Can an Oxshott basement reach beyond the house footprint?
Outside the Green Belt, Elmbridge sets no depth or garden limit.
Inside it, the room must stay within the existing footprint.
We confirm which applies before we draw.
Is flooding a worry for an Oxshott basement?
Most Oxshott land is high ground.
Parts near the Mole and Rythe sit in higher flood zones.
We check each plot against the Environment Agency map first.
What does an Oxshott basement cost?
Our basement band is £450 to £780 a sq ft, construction only.
Our 2026 cost guide puts a new dig at £500k to £900k and more.
Tell us about your home in Oxshott.
Your name and one way to reply are enough. It goes straight to the studio.
- Already have an architect or designer? We build to their design. Working with your designer
- An NDA on request, and your home is never published without your consent. How we work in confidence