Basement gym with mirrored walls between lit pilasters, a spin bike and a rowing machine.

Basement gyms in West London.

Chelsea · SW3 · Chelsea townhouse, opened up and fitted outCase study

Home gyms below West London houses, planned for height, sound and air.

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A West London gym, built for lifting and quiet.

One storey
Height shared by slab, floor and ducts
Isolated floor
Rubber over a resilient layer
No mezzanine
The storey cannot be split later

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement gyms and spa rooms in West London W/SW, under one contract. A new basement dig typically runs £500k to £900k. Converting an existing basement runs £180k to £300k. Call 020 7731 6841, and a budget estimate typically follows within seven days.

A basement gym needs more height than most rooms. Slab, rubber flooring and ducts all come out of one storey.

Weights and treadmills make noise. So the gym floor sits on isolating pads, apart from the structure.

Fresh air and cooling run from a plant room. A steam room or sauna can share it.

Under a Chelsea townhouse, we built a gym with mirrored walls between lit pilasters. It sits in a basement under the whole house.

What the borough sets for a West London gym.

Council
Kensington and Chelsea governs Chelsea, Kensington and Notting Hill, through its 2024 Local Plan. Fulham sits with Hammersmith and Fulham.
Ceiling height
Policy CD11 gives one storey. Rubber, slab and ducts must leave room for overhead lifts.
No second floor
The storey cannot be split in two later. A mezzanine for a studio is not an option.
Sound
The gym floor sits on isolating pads, apart from the structure.
Pool allowance
The SPD gives a pool a little extra depth. A gym on its own gets none.
Plant
Gym cooling and steam share one plant room.

Source: Kensington and Chelsea’s Local Plan 2024, Policies CD4, CD5, CD11 and CD13. Read on 3 October 2026. Policies change, so we read them again for your address.

What a basement gym costs in West London.

£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.

A West London gym is priced as part of its basement.

The cost guide figures are whole project totals.

Fees, party wall costs, contingency and VAT sit outside them.

Open the calculatorThe 2026 cost guideCan I build it here?

How tall should a West London basement gym be?

Enough for overhead lifts once the floor and ducts are in.

We set the floor level early to protect it.

Can I add a mezzanine to my basement gym later?

Not in Kensington and Chelsea. The storey cannot be split in two.

Will the neighbours hear the gym?

The floor sits on isolating pads, apart from the structure.

That keeps impact noise out of the party walls.

Can a basement gym have a sauna or steam room?

Yes. Cooling and steam can share one plant room.

Both are drawn into the one planning application.

Tell us about your home in West London.

Your name and one way to reply are enough. It goes straight to the studio.

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