Loft conversions in Westminster.

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

Westminster SW1P is apartments almost entirely. A loft here is the exception.

Westminster roofs, near the river.

56: Conservation areas across the city
11,000+: Listed buildings in Westminster
SW1P: Georgian terraces and mansion blocks

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in Westminster SW1P, under one contract. A main dormer loft typically runs £90k to £140k. A mansard loft runs £140k to £220k. Call 020 7731 6841, and a budget estimate typically follows within seven days.

SW1P is Georgian terraces and mansion blocks close to the Thames. Nearly every home is an apartment.

Many roofs here are seen across open spaces. Westminster does not normally extend roofs exposed to long views.

Conservation areas cover about 76% of the city. More than 11,000 buildings are listed.

In a listed house, consent can reach the roof timbers and upper rooms.

So a new floor is rare. Using the existing void, with consent, is the likelier route.

What the city allows on a Westminster roof.

Council: City of Westminster, for planning and listed building consent alike.
Long views: Roofs exposed to long views from public spaces are not normally extended.
Finished terraces: A terrace already completed with roof storeys is not normally extended again.
Listed buildings: Listed consent can cover the roof structure and the top floor rooms.
Flats: A flat has no householder permitted development rights. Roof changes need planning.

Source: Westminster’s Roofs guide to alterations and extensions on domestic buildings. Read on 6 October 2026. Policies change, so we read them again for your address.