Builders in Clapham, Kennington, Vauxhall & Streatham

Excel Construction carries out house extensions, loft conversions and full refurbishments in Clapham, Kennington, Vauxhall and Streatham, managed by one main contractor from design stage to handover.

Building work we do in Clapham, Kennington, Vauxhall and Streatham

• Side return and rear extensions for terraced houses.
• Loft conversions, including mansards on flat-fronted terraces.
• Full house refurbishments and renovations.
• Basement and lower-ground-floor works.
• Roofing and flat roof replacement.

Building on local homes

This part of London is full of Georgian and Victorian terraces, many with narrow side access, shared party walls and limited parking. Kennington and parts of Clapham have a lot of period housing, and Streatham has Victorian and Edwardian family homes that are popular for side return extensions and rear dormers. Many properties here have been converted into flats, which affects what you can do without planning permission.

Area notes: what we see in each town

Clapham

Georgian and Victorian terraces with narrow side access, and many homes converted into flats. Houses suit side return extensions and rear dormers.

Kennington

Period terraces, many in conservation areas, where design, materials and roof changes need care.

Vauxhall

A mix of period houses and newer flats. Check whether your home is a house or a flat before planning, because the rules differ.

Streatham

Victorian and Edwardian family homes that are popular for side return extensions and rear dormers.

Planning and permitted development

Most of the area falls under Lambeth Council, with part of Clapham under Wandsworth. Lambeth has many conservation areas. Flats and maisonettes do not have the same permitted development rights as houses, so we check what is allowed for your property first.

For more detail, read our guide to loft conversion planning permission in London and Surrey.

How a project works with us

1. Free site visit. We look at the house, listen to what you want and talk through options.
2. Design and approvals. Drawings, structural design, planning where needed, building control and party wall notices.
3. Fixed written quote. A clear price, with a named project manager.
4. Build. Our own team carries out the work, managed by one main contractor.
5. Handover. A final check with you before you move back in.

What does it cost?

Every project is priced after a site visit, but our guides explain typical 2026 costs. See the house extension cost guide, the new build cost guide, the flat roof cost guide, the loft conversion cost guide and the kitchen extension cost guide. You can also read about our extensions, loft conversions and new builds.

Why homeowners choose Excel Construction

• One main contractor, so there is no chasing separate trades.
• Around 20 years of experience and a team of around 24 operatives.
• Clear written quotations and a named project manager.
• Party wall notices, drawings and building control handled for you.

Questions homeowners ask

Can I extend a flat in Clapham?

Flats do not have the same permitted development rights as houses, so you will usually need planning permission and, in a shared building, the freeholder’s consent.

How do you handle access on narrow streets?

We plan skips, deliveries and scaffold positions early and work with neighbours and the council on parking suspensions where needed.

Get a free quote in Clapham

Planning work in Clapham, Kennington, Vauxhall and Streatham? Contact us for a free site visit and quote, or see all the areas we cover.

Nearby areas we cover: Putney and Richmond, Chelsea, Fulham and Kensington, Battersea and Wandsworth, Brixton and Herne Hill.