Basement swimming pools in Westminster.

Kensington · W8 · Kensington new-build housesCompleted work, photograph

Westminster SW1P is mansion blocks and listed Georgian houses. A pool is possible only under a whole house.

A Westminster pool, beside the river.

11,000+: Listed buildings across Westminster
Near the Thames: Flood risk is the first check
SW1P · SW1H: Mostly leasehold apartments

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement swimming pools in Westminster SW1P, 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.

Close to the river, Westminster is mansion blocks and Georgian terraces. Almost every home is an apartment. A pool below a block is the freeholder’s decision, not a single owner’s.

A whole house is rarer, and often listed. Policy 50 allows one storey under the lowest original floor. Below a listed house, the original hierarchy of spaces must stay balanced.

The Thames makes flood risk the first test. Flood zones 2 and 3 need a site specific assessment. A pool tank in wet ground can lift when drained. We design it with weight, anchors or relief to resist that.

Our pool dig for two Kensington houses went three floors down. In SW1 we fitted an apartment with interiors and joinery. One team designs, prices and builds the work.

What the council allows in Westminster.

Council: City of Westminster, with over 11,000 listed buildings.
Listed houses: A basement must not unbalance the original hierarchy of spaces.
Depth: Policy 50. A single storey under the lowest original floor.
Flood risk: Flood zones 2 and 3 need a site specific flood risk assessment.
On site: The Code of Construction Practice applies to every basement scheme.

Source: Westminster’s City Plan, January 2026 edition, Policy 50. Read on 16 October 2026. Policies change, so we read them again for your address.