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Single and double storey rear and side extensions across South West London. Large family homes in Wimbledon, Richmond, and Putney offer significant scope for substantial additions.
Find a builder →Velux, dormer, hip-to-gable, and mansard conversions. SW London's Victorian and Edwardian semis frequently have roof space well suited to a master bedroom suite.
Find a builder →Full house refurbishments and internal remodelling. High-specification finishes — bespoke joinery, underfloor heating, premium tiling — are standard in SW London buyer expectations.
Find a builder →Office refurbishments and shopfits across South West London, including Wimbledon town centre, Putney High Street, and the Wandsworth commercial district.
Find a builder →RSJ steel beam installations, load-bearing wall removals, and underpinning. Open-plan ground-floor living is the most popular structural project across SW London family homes.
Find a builder →Garden studios, new build projects, and basement conversions. Basements extremely popular in Richmond and Wimbledon where high land values make below-ground space worthwhile.
Find a builder →| Job | Low estimate | High estimate |
|---|---|---|
| Single-storey extension | £25,000 | £50,000 |
| Double-storey extension | £45,000 | £90,000 |
| Loft conversion (Velux) | £20,000 | £35,000 |
| Loft conversion (dormer) | £35,000 | £65,000 |
| Full refurbishment (3-bed) | £40,000 | £100,000 |
| Kitchen extension | £30,000 | £60,000 |
| Garage conversion | £12,000 | £25,000 |
| Garden room / studio | £15,000 | £40,000 |
| Basement conversion | £40,000 | £80,000 |
| Party wall agreement | £700 | £2,000 |
| RSJ beam installation | £1,500 | £4,000 |
| New build (per m²) | £2,000 | £4,000 |
Prices are estimates for South West London 2026. Actual costs vary by job complexity, specification, and location. Always get multiple quotes.
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South West London — encompassing SW1 through SW20 and the TW postcodes of Richmond, Twickenham, and Teddington — is home to some of London's most desirable family property. Large Victorian and Edwardian semis and terraces with generous rear gardens are the dominant housing type across Wandsworth, Wimbledon, and Putney, making the area ideal for substantial extensions. Double-storey rear extensions, side-return infills, and loft conversions are the most common projects, typically adding one to three bedrooms and significantly improving resale value.
The London Borough of Richmond upon Thames has some of the strictest conservation area policies in London. Richmond town centre, Kew, Twickenham, and Petersham all have conservation area designations that can restrict extension heights, materials, and design. Builders working in these areas need to be familiar with the specific requirements of these designations — always confirm planning feasibility before appointing an architect or builder. Wandsworth Common and Putney Heath also sit within planning-sensitive zones.
Basement conversions are more common in South West London than almost anywhere else in the capital outside of Prime Central London. In high-value streets in Wimbledon Village, East Putney, and Barnes, excavating to create below-ground living space — a cinema room, gym, or additional bedroom — is increasingly popular. These projects are complex and require specialist contractors; always instruct a structural engineer and confirm your builder has recent basement conversion experience before work begins.
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