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Single and double storey rear and side extensions across Wandsworth SW18, SW11, SW15, and SW12. Victorian and Edwardian semis with rear garden space are ideal for extending.
Find a builder →Velux, dormer, hip-to-gable, and mansard loft conversions. Wandsworth's large stock of semis frequently has roof space well suited to a master bedroom with en suite.
Find a builder →Full house refurbishments and internal remodelling. Strong family market across Wandsworth drives demand for open-plan ground-floor layouts and kitchen upgrades.
Find a builder →Office refurbishments and shopfits across Wandsworth town centre, Tooting High Road, and the Balham commercial district.
Find a builder →RSJ steel beam installations, load-bearing wall removals, and underpinning. Open-plan kitchen-diners are the most requested structural project across Wandsworth family homes.
Find a builder →Garden studios, garage conversions, and outbuildings. Larger Wandsworth properties near the Common and in Putney suited to garden room additions.
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 Wandsworth 2026. Actual costs vary by job complexity, specification, and location. Always get multiple quotes.
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Wandsworth is one of London's most family-oriented boroughs, and its housing stock reflects that. Victorian and Edwardian semis and terraces are the dominant property type across SW18 (Wandsworth town), SW11 (Battersea and Clapham Junction area), SW15 (Putney), and SW12 (Balham). Most of these properties have rear gardens of reasonable size, making them well suited to single or double storey rear extensions. The combination of family demand, competitive property prices (relative to neighbouring Richmond and Fulham), and the presence of large gardens makes Wandsworth one of London's busiest markets for residential extensions.
Wandsworth Common sits at the premium end of the borough. Properties backing onto or near the Common command significant premiums, and extensions and refurbishments in this area tend to be at the higher specification end. The Wandsworth Common conservation area restricts permitted development for some properties in this area. Putney, particularly around the Thames and Putney Heath, is similarly planning-sensitive. Tooting and Balham offer more affordable entry points where builders are generally very competitive on price for straightforward extension projects.
When hiring a builder in Wandsworth, confirm they have specific experience with the type of property you own — Victorian terrace rear extensions and Edwardian semi loft conversions are quite different in their structural requirements. Always ask for at least two references from recent local projects, check they hold public liability insurance, and use a written contract with a staged payment schedule before any work begins.
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