Builders in Wandsworth

Much of SW18 is late Victorian and Edwardian terraced housing. Around Wandsworth Common the houses are larger, including the Toast Rack streets off Trinity Road, while Earlsfield and the Southfields Grid are long runs of terraces with deep back additions and good roof space. These houses take well to a side return or rear extension and a dormer loft, and many families do both together.

Original features such as bay fronts, cornicing, fireplaces and sash windows are worth keeping. The wiring, heating and plumbing behind them usually are not. A full refurbishment is the time to renew the services, improve insulation and deal with any damp, while keeping the character that made you buy the house.

A Wandsworth kitchen extension usually fills the side return beside the back addition, runs across the back of the house, or wraps round as one room facing the garden. Our guides to side return extensions, rear extensions in London and wraparound extension ideas walk through the choices, and what a single storey extension costs sets out the figures.

Our kitchen extensions page shows how we design and build them, and you can try each layout on a home like yours in our free extension planner.

On SW18 terraces the usual loft conversion is a rear dormer, sometimes extended over the back addition as an L shaped dormer to fit a second bedroom or a larger bathroom. Our guides cover Victorian loft conversions, adding an en suite in the loft and why a loft needs a structural engineer. Our loft conversions page explains which type suits which roof.

Planning applications in SW18 go to Wandsworth Council. The council has conservation areas across the borough, including streets around Wandsworth Common, and inside them the rules are tighter. A dormer loft conversion in a conservation area is not permitted development and needs planning permission, and changes to the front of the house get close attention. Flats and maisonettes have no permitted development rights, so extending a flat always needs an application.

We check the position for your address early, prepare the drawings and supporting information, and manage the application through to a decision. Terraced work usually needs party wall agreements too, and we build the time for them into the programme.

Typical London jobs priced on our estimator in October 2026, ex VAT and indicative rather than a quotation:

• A single storey extension of about 20 m² of new floor, flat roofed, plus making good the room it joins: around £57,000.
• A rear dormer loft conversion: £68,000 to £81,000.
• A whole house refurbishment with a new extension: £1,100 to £1,350 per square metre of floor worked on.

Kitchen units, worktops and appliances are priced separately. Our minimum for a complete extension project, including finishes and fittings, is around £85,000. Our Victorian terrace renovation cost guide and loft conversion cost guide show the full breakdowns, and the free estimate prices your own project in two minutes.

Our office is in Chiswick, and our work in South West London includes Woodside in Wimbledon, where we turned two flats back into one house and added a loft with three bedrooms and two bathrooms, and Ellerby Street in Fulham. If you live nearer the river or the high street, see our pages on builders in Putney and builders in Battersea.

Every project runs as one design and build service, with a single team responsible from concept to completion. We carry £10M public and employers' liability cover, agree the programme and working arrangements with you before we start, and keep neighbours considered throughout.