Basement conversion and construction in Holland Park.
Fulham · SW6 · Fulham basementsCompleted work, photograph
Basements under Holland Park villas, within one storey. Trees, drainage and listed fabric are designed in from the start.
Under a Holland Park villa, one storey.
- CD11
- One storey, under half the garden
- Trees
- A full survey goes with the application
- W11 · W14
- Villas on wide plots
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement conversion and construction in Holland Park W11, 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.
Holland Park is villas on wide plots, many semi-detached, with mature gardens and trees.
A wide garden leaves room for a generous single storey. Half of it must stay unexcavated, in one piece.
The borough resists any dig under a listed building. Some villas here are listed.
The trees matter too. A basement that threatens a valued tree is resisted.
So we plan the structure, the drainage and the tree protection as one design.
What the council allows in Holland Park.
- Council
- Royal Borough of Kensington and Chelsea, Local Plan of July 2024.
- Extent
- Policy CD11. One storey, under no more than half the garden, left in one area.
- Trees
- No loss or long term threat to valued trees. A full tree survey goes in.
- Listed villas
- No excavation under a listed building, including its vaults.
- Soil and drainage
- One metre of soil over any basement under a garden. Sustainable drainage is required.
- Flood risk
- Every basement in the borough needs a flood risk assessment. The borough names a Holland Park critical drainage area.
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.
Built below ground in west London.
Fulham·Basements
Fulham basements
Basements dug, waterproofed and finished by our own team, under Fulham houses.
See the project
Chelsea·Townhouse
Chelsea townhouse, opened up and fitted out
A basement under the full footprint of a Chelsea townhouse, with its gym.
See the projectCompleted work, photographs
What a basement costs in Holland Park.
£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 villa basement is often wider than a terrace’s, so the total rises.
The guide figures are project totals.
Fees, party wall costs, contingency and VAT sit outside both.
Open the calculatorThe 2026 cost guideBasement costs in full
What Holland Park owners ask about basements.
In Holland Park
- Every service in Notting Hill and Holland Park
- Luxury refurbishment in Holland Park
- Party wall surveying in Holland Park
- Basement swimming pools in Holland Park
- Basement gyms in Holland Park
- Basement cinema rooms in Holland Park
- Basement golf simulator rooms in Holland Park
- Luxury painting and decorating in Holland Park
Basements nearby
- Basement construction across London
- Basement construction in Fulham
- Basement construction in Chelsea
- Basement construction in Kensington
- Basement construction in St John’s Wood
- Basement construction in South Kensington
- Basement construction in Knightsbridge
- Basement construction in Belgravia
- Basement construction in Mayfair
- Basement construction in Marylebone
- Basement construction in Hampstead
- Basement construction in Notting Hill
- Basement construction in Clapham
- Basement construction in Weybridge
- Basement construction in Cobham
- Basement construction in Oxshott
- Kensington
- South Kensington
- Chelsea
- Chiswick
Further reading, from the journal
How big can a basement be under a Holland Park villa?
One storey, under no more than half the garden.
The half you keep must stay in one piece, usually at the far end.
On a wide plot that still leaves room for a large single floor.
Can I dig a basement under a listed Holland Park house?
Not under the house itself. The borough resists digging under any listed building.
A basement in the garden may be possible, built structurally independent of the house.
The link to the house must be discreet.
Will the trees in my Holland Park garden stop a basement?
They shape it more than stop it.
The borough resists any loss or long term threat to valued trees.
A full tree survey and a protection plan go in with the application.
Does a Holland Park basement need a flood risk assessment?
Yes. Kensington and Chelsea asks for one with every basement.
It also needs sustainable drainage, and a pumped device against sewer flooding.
What does a Holland Park basement cost?
Digging new runs from £500k to £900k and more, as a project total.
A wide villa tends toward the top of that range.
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