Basement gyms in Cobham.
Chelsea · SW3 · Chelsea townhouse, opened up and fitted outCompleted work, photograph
A home gym below a Cobham house, with room for a sauna beside it. We design, price and build the whole room.
What a Cobham gym has to solve.
- No depth limit
- Elmbridge sets no basement depth or garden cap
- A gym we fitted
- In a Chelsea townhouse basement
- KT11
- Large family houses on generous plots
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement gyms and spa rooms 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.
Cobham family houses are big, but the ground floor is for living. A gym in the basement keeps noise and sweat below it. Weights stay away from the bedrooms. The garden is left alone.
Elmbridge has no basement policy, so a gym counts as an extension. With no depth limit, ceiling height can follow the gym. The Green Belt and flood zones are the checks that remain. A gym may be considered in Zones 2 and 3a.
Overhead lifts need clear height, so slab and ducts are drawn together. The floor is built to take dropped bars. Sound is isolated from the rooms above. Cooled fresh air carries off the heat of training.
We fitted a basement gym in a Chelsea townhouse, lit between mirrored walls. One team designs, prices and builds the room.
What the council allows in Cobham.
- Council
- Elmbridge Borough Council. It judges a gym basement as an extension.
- Depth
- No council depth limit. Lifting sets the ceiling height.
- Green Belt
- Policy DM18 asks for a gym wholly underground, with discreet lightwells only.
- Flood zones
- A gym may be considered in Zones 2 and 3a. Zone 3b bars it.
- Floor
- Reinforced and isolated, so weights do not shake the house.
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.
Gyms and spas in the borough.
Chelsea·Townhouse
Chelsea townhouse, opened up and fitted out
A basement gym in a Chelsea townhouse, with mirrored walls.
See the projectCompleted work, photographs
What a basement gym 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 gyms.
In Cobham
- Every service in Weybridge, Cobham and Oxshott
- Basement construction in Cobham
- Basement swimming pools in Cobham
- Basement cinema rooms in Cobham
- Basement golf simulator rooms in Cobham
Gyms nearby
- Basement gyms across London
- Basement gyms in Chelsea
- Basement gyms in Kensington
- Basement gyms in South Kensington
- Basement gyms in Holland Park
- Basement gyms in Notting Hill
- Basement gyms in Knightsbridge
- Basement gyms in Belgravia
- Basement gyms in Mayfair
- Basement gyms in St John’s Wood
- Basement gyms in Hampstead
- Basement gyms in Fulham
- Basement gyms in Weybridge
- Basement gyms in Oxshott
- Wimbledon
- Richmond, Twickenham and East Sheen
Further reading, from the journal
Can a Cobham basement gym include a steam room?
Yes. We plan the gym and the hot room as one suite.
A shared plant room serves both.
It also keeps noise away from the rest of the house.
How high must a Cobham basement gym ceiling be?
Enough for overhead lifts and a hung ceiling.
Slab, flooring and ducts all take height.
We settle it before the dig.
Is there a depth limit on a Cobham basement gym?
Elmbridge sets no basement depth limit.
Structure, groundwater and the Green Belt still shape the dig.
We settle depth before design starts.
Will a Cobham basement gym be heard upstairs?
Not if the floor is isolated from the structure.
A resilient layer and a decoupled ceiling stop most impact noise.
Sealed doors keep the music in.
What does a basement gym in Cobham cost?
Our basement band is £450 to £780 a sq ft, construction only.
We price your house, not a template.
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