Basement conversion and construction in Westminster.

Central London · SW1 · Central London apartment, interiors and joineryCompleted work, photograph

Westminster SW1P is apartments almost entirely. A basement is possible on some houses, and we say which.

Westminster basements are the exception.

Policy 50: One storey below the lowest original floor
Near the river: Flood risk is checked before design
SW1P · SW1H: Mansion blocks and Georgian terraces

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle basement conversion and construction 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. Nearly every home is an apartment, often leasehold.

A basement under a block is a freeholder’s decision, not one flat’s. So most enquiries here concern existing lower floors.

For a whole house, Policy 50 allows one storey under the lowest original floor. Under a listed house, the original hierarchy of spaces must stay balanced.

Near the Thames, flood risk comes first. Flood zones 2 and 3 need a site specific assessment.

Every scheme follows Westminster’s Code of Construction Practice. A qualified engineer certifies the structural methodology statement.

What the council allows in Westminster.

Council: City of Westminster, with over 11,000 listed buildings across the city.
Depth: Policy 50 permits one storey under the lowest original floor.
Listed houses: A basement must not unbalance a listed building’s original hierarchy of spaces.
Flood risk: Flood zones 2 and 3 need a site specific flood risk assessment.
Garden cover: A metre of soil and a 200mm drainage layer sit above a garden basement.
On site: Westminster’s Code of Construction Practice applies to every basement scheme.