Loft conversions in South London.

Clapham · SW4 · Clapham bespoke joineryCase study

A bedroom and bathroom in the roof of a South London house. Drawn, priced and built by one team.

Up into the roof of a South London house.

40 cubic metres: A terrace roof, outside conservation areas
Two shapes: A rear dormer, or a mansard
Party walls: Notices served before steels go in

NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in South London SW and SE. 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.

Victorian terraces here often have a butterfly or pitched roof with usable height. A rear dormer turns that void into a bedroom.

Outside a conservation area, a terrace roof may grow without an application. Inside one, the design needs planning and must suit the street.

New steels bear on both party walls, so notices go out first. A new stair is then fitted to building control’s fire rules.

Our joiners build wardrobes into the eaves, as we did in a Clapham house.

What applies to a South London roof.

Council: London Borough of Lambeth, under its Local Plan adopted in September 2021.
Permitted development: Outside conservation areas, a terrace may add up to 40 cubic metres.
Policy Q11: Extensions are supported in principle, if they stay subordinate to the house.
Shared walls: Steels, raising or underpinning a party wall need two months’ notice.
Wandsworth side: Near Clapham Junction, Wandsworth’s Policy LP5 applies instead. We confirm the borough first.

Source: Lambeth Local Plan 2021, Policy Q11, and the Lambeth Design Guide, Part 4 (2023). Read on 5 October 2026. Policies change, so we read them again for your address.