Basement gyms in Holland Park.
Chelsea · SW3 · Chelsea townhouse, opened up and fitted outCompleted work, photograph
A gym below a Holland Park villa, lit from a lightwell. The garden’s trees stay safe.
What a Holland Park gym has to solve.
- W11 · W14
- Villas on wide plots
- Trees protected
- A full tree survey goes in
- Half the garden
- Left unexcavated, in one piece
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement gyms and spa rooms in Holland Park W11, 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.
Holland Park is villas on wide plots, many semi-detached. The gardens are mature and the trees are tall. A gym here need not feel buried. A lightwell can bring real daylight to the room.
A wide garden leaves room for a generous single storey. Half of it must stay unexcavated, in one piece. Some villas are listed, and no digging goes under them. We check the listing before anything is drawn.
Roots decide where walls can go, so the gym sits clear of valued trees. Drainage is designed with the structure. Part of the area is a critical drainage zone. Fresh air comes down the lightwell, not from a noisy unit.
Our gym work in the same borough is in Chelsea. That basement has mirrored walls between lit pilasters. The team that designs a room also prices it and builds it.
What the council allows in Holland Park.
- Council
- Royal Borough of Kensington and Chelsea, under its 2024 plan. A gym is treated as basement.
- Floor area
- CD11 leaves half the garden whole. The gym and its sauna fill what is allowed.
- Trees
- A full survey goes in. Walls, lightwell and drains keep clear of valued roots.
- Listed villas
- Nothing may be dug beneath a listed villa. A gym there uses the floor already present.
- Drainage
- A flood assessment and sustainable drainage are required. Pumps protect the gym floor.
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.
Gyms below villas in the borough.
Chelsea·Townhouse
Chelsea townhouse, opened up and fitted out
A basement gym in a Chelsea townhouse, in the same borough as Holland Park.
See the project
Kensington·New build
Kensington new-build houses
A steam room on a lower leisure floor, built in Kensington.
See the projectCompleted work, photographs
What a basement gym costs in Holland Park.
£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 Holland Park owners ask about gyms.
In Holland Park
- Every service in Notting Hill and Holland Park
- Luxury refurbishment in Holland Park
- Basement construction in Holland Park
- Party wall surveying in Holland Park
- Basement swimming pools in Holland Park
- Basement cinema rooms in Holland Park
- Basement golf simulator rooms in Holland Park
Gyms nearby
- Basement gyms across London
- Basement gyms in Chelsea
- Basement gyms in Kensington
- Basement gyms in South Kensington
- 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
- Kensington
- South Kensington
- Chelsea
- Chiswick
Further reading, from the journal
Can a Holland Park basement gym have daylight?
Often, yes.
A lightwell brings light down beside the room.
Its size follows the garden and the trees.
Will a Holland Park basement gym harm my garden trees?
It must not.
The borough resists any loss of valued trees.
We survey every tree and plan the walls around the roots.
Can a listed Holland Park villa have a basement gym?
Not by digging under it.
The borough resists any dig under a listed building, vaults included.
A gym may still fit in the existing lower floor.
Do I need a flood report for a Holland Park basement gym?
Yes.
Every basement in the borough needs a flood risk assessment.
Sustainable drainage is required as well.
What does a Holland Park basement gym cost?
Our basement band is £450 to £780 a sq ft, construction only.
We price the house itself.
Tell us about your home in Holland Park.
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