Loft conversions and extensions in Clapham

We design and build loft conversions, extensions and renovations across Clapham, from the Victorian terraces off Clapham High Street to the family houses between the commons.

Open-plan dining and living room with a log burner

A recent Buildspace Projects build.

Homes in Clapham and what suits them

Clapham's Victorian and Edwardian terraces usually suit a rear dormer or an L-shaped dormer in the loft, and a side-return or wraparound extension at the back to make an open-plan kitchen. Mansard lofts are common on terraces where planners prefer a more traditional roof shape.

Planning in Clapham

Clapham is split between two councils. Clapham Old Town, Clapham High Street and Clapham Park are in Lambeth; the streets west of Clapham Common, around Clapham Junction and Northcote Road, are in Wandsworth. We check which council your home is in before we start the drawings.
Lambeth has several conservation areas here, including Clapham (around Clapham Common), Clapham High Street, Clapham Park and Northbourne Road, and Clapham Road. In a conservation area, loft dormers need full planning permission.
Outside conservation areas, many rear dormers and single-storey rear extensions can be built under permitted development.
Almost every Clapham terrace shares a party wall, so we flag party wall notices at design stage and arrange them through our partner party wall surveyors.

How we work in Clapham

Our in-house team does the measured survey, drawings and the planning or permitted-development application through Plan It, then manages the build with a single project lead. Party wall agreements are handled through our partner surveyors. Typical build times: rear dormer 10–12 weeks, L-shaped dormer 12–14 weeks, mansard 12–16 weeks, rear extension 12–16 weeks.

Start your project

Need drawings and planning first, or ready to price the build? Choose your route, or call 0203 488 6500.

Get a free build estimate →Instant budget range, build time and planning route.Design and planning (Plan It) →Survey, drawings and the planning application.

Our work in Clapham

West Road, Clapham SW4: rear extension with an open-plan kitchen and dining room by Buildspace Projects

West Road, SW4Rear extension with an open-plan kitchen and dining room in Clapham.View the case study (PDF) →

Clapham: questions homeowners ask

Do I need planning permission for a loft conversion in Clapham?

Outside conservation areas, many rear dormers are permitted development. In Lambeth's Clapham conservation areas, loft dormers need planning permission.

Which council handles planning in Clapham?

Lambeth Council for Clapham Old Town, Clapham High Street and Clapham Park; Wandsworth Council for the streets west of Clapham Common.

How long does a loft conversion or extension take in Clapham?

Most of our lofts take 10–16 weeks on site and most rear extensions 12–16 weeks, depending on the design. If you need planning permission, allow around 8 weeks for the council's decision on a householder application, plus time to prepare the drawings.

Can you design it as well as build it?

Yes. Our Plan It service covers the measured survey, drawings and the planning or permitted-development application. You can stop there, or carry straight on to the build with the same team.