Basement swimming pools in Cobham.
Kensington · W8 · Kensington new-build housesCompleted work, photograph
A pool below a Cobham house, with its plant room and dry hall. We design, price and build it all.
What a Cobham pool has to solve.
- Grade 3
- Waterproofing to BS 8102 for habitable space
- Zones 2 and 3a
- A pool may be considered, bedrooms may not
- KT11
- Large plots beside the Mole valley
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement swimming pools in Cobham KT11, 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.
Many Cobham plots are wide enough for a garden pool. A pool below the house is another matter. It is private, warm and usable in January. The lawn and the old trees stay as they are.
Elmbridge has no basement policy, so a pool is judged as an extension. Flood zones then matter most. In Zones 2 and 3a a pool may be considered. In Zone 3b no basement is allowed.
Water is heavy and the ground near the Mole can be wet. The slab and walls are engineered for the load and for uplift. Waterproofing follows BS 8102 Grade 3. The hall needs a plant room and dehumidification to keep the air dry.
Our nearest pools are in Kensington and Knightsbridge. One sits two floors below the street. The other is lined in marble. One team designs, prices and builds the pool and the plant.
What the council allows in Cobham.
- Council
- Elmbridge Borough Council. It judges a pool basement as an extension.
- Flood zones
- Zone 3b bars any basement. Zones 2 and 3a may allow a pool.
- Green Belt
- Policy DM18 asks for a pool wholly underground, inside the existing footprint.
- Groundwater
- A hydrology report is needed where groundwater is a risk.
- Plant
- Filtration, heating and air handling need a room of their own.
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.
Pools in the borough.
Kensington·New build
Kensington new-build houses
An indoor pool two floors below the street, in Kensington.
See the project
Knightsbridge·Townhouse
Knightsbridge townhouse, pool and wine room
A marble lined pool in a Knightsbridge townhouse.
See the projectCompleted work, photographs
What a basement pool costs in Cobham.
£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.
What Cobham owners ask about pools.
In Cobham
- Every service in Weybridge, Cobham and Oxshott
- Basement construction in Cobham
- Basement gyms in Cobham
- Basement cinema rooms in Cobham
- Basement golf simulator rooms in Cobham
Pools nearby
- Basement swimming pools across London
- Basement swimming pools in Chelsea
- Basement swimming pools in Kensington
- Basement swimming pools in South Kensington
- Basement swimming pools in Holland Park
- Basement swimming pools in Notting Hill
- Basement swimming pools in Knightsbridge
- Basement swimming pools in Belgravia
- Basement swimming pools in Mayfair
- Basement swimming pools in St John’s Wood
- Basement swimming pools in Hampstead
- Basement swimming pools in Fulham
- Basement swimming pools in Weybridge
- Basement swimming pools in Oxshott
- Wimbledon
- Richmond, Twickenham and East Sheen
Further reading, from the journal
Can a Cobham basement swimming pool go in a flood zone?
Not in Zone 3b, where no basement is allowed.
In Zones 2 and 3a it may be considered.
We check the zone and the groundwater first.
How is a Cobham basement pool kept dry and warm?
Dehumidifiers pull moisture from the air all day.
The plant room heats the water and filters it.
Walls and floor are tanked to BS 8102 Grade 3.
What does a basement pool in Cobham cost?
Our basement band is £450 to £780 a sq ft, construction only.
We price your house, not a template.
Does the Green Belt limit a Cobham basement pool?
It can, on plots inside it.
The pool must be wholly underground and inside the footprint.
We check the boundary address by address.
How much plant does a Cobham basement pool need?
A room for filtration, heating and air handling.
It sits beside the pool hall, with quiet ducts.
We plan its size and route at design stage.
Tell us about your home in Cobham.
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