Basement swimming pools in North London.

Knightsbridge · SW1 · Knightsbridge townhouse, pool and wine roomCase study

A pool beneath a North London house, within one storey and half the garden. The water table is studied before the tank is drawn.

Get a cost estimate Call 020 7731 6841

A pool below a North London house.

One storey: Camden’s limit under Policy A5
Half the garden: The most a basement may take
Audited: Impact assessment checked independently

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement swimming pools in North London NW and N, 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 pool is the heaviest room a basement can hold. In North London, the springs and clay make the tank design critical. Groundwater studies come before the pool size is fixed.

Camden limits a basement to one storey. The pool depth, the slab and the plant all fit inside it. A deep end often sets the dig level for the whole floor.

A pool hall needs dehumidification, filtration and heat. The plant room is planned with the pool, not added later. Air is drawn and exhausted where neighbours will not hear it.

Our Knightsbridge pool shows the finish we work to.

What Camden asks of a pool below ground.

Council: London Borough of Camden, under its Local Plan adopted in July 2017.
One storey: Policy A5. One storey only, and never under an existing basement.
The garden: No more than half of each garden. Less than 1.5 times the house’s footprint.
Impact: A Basement Impact Assessment, independently audited. Neighbour damage is capped at Burland category 1.
Hampstead plan: The 2025 Hampstead Neighbourhood Plan adds groundwater and tree tests.

Source: Camden Local Plan 2017, Camden’s Basements guidance 2021, and the Hampstead plan 2025. Read on 5 October 2026. Policies change, so we read them again for your address.