Find trusted local builders in Chiswick (W4, W6) for premium extensions, loft conversions, basement conversions and full refurbishments. Post a job free — builders contact you within hours.
Premium rear and side extensions on Chiswick's large Victorian and Edwardian detached and semi-detached properties.
Find a builder →Dormer and mansard loft conversions in W4. Conservation-area planning experience included for Chiswick properties.
Find a builder →Full house refurbishments and period property restorations across Chiswick. High-specification finishes standard.
Find a builder →Commercial fit-outs for retail, hospitality and office space along Chiswick High Road and the surrounding area.
Find a builder →RSJ beam installation, basement underpinning, and party wall works. Experienced with Chiswick's premium residential streets.
Find a builder →High-spec garden studios, annexes and outbuildings in Chiswick. New single-dwelling builds in W4 also considered.
Find a builder →| Job | Low estimate | High estimate |
|---|---|---|
| Single-storey rear 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 house refurbishment (3-bed) | £40,000 | £100,000 |
| Kitchen extension (open plan) | £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 |
| Load-bearing wall removal (RSJ) | £1,500 | £4,000 |
| New build (per m²) | £2,000 | £4,000 |
Prices are estimates for Chiswick 2026. Conservation area and high-specification projects typically sit at the top of these ranges. Always get multiple quotes.
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Chiswick is one of West London's most sought-after suburbs, and its building market reflects the premium nature of the area. Large Victorian and Edwardian detached and semi-detached properties in W4 — particularly around Chiswick House, the riverside streets and the conservation villages — lend themselves to ambitious extension, loft conversion and basement conversion projects. Specification levels here are typically high: natural stone, underfloor heating, bespoke joinery and glazed structural roof lanterns are common features rather than luxuries. Garden studios are also extremely popular, particularly for the area's large numbers of professional home workers.
Chiswick has multiple designated conservation areas, and planning sensitivity is meaningfully higher than in many comparable London suburbs. The Chiswick House and Walled Garden area, the Chiswick Village conservation area, and the Grove Park area all have planning rules that can affect extension size, roof alterations, external materials, and window designs. Builders experienced in Chiswick will know where the planning sensitivities lie and can advise before you commission architects. Always check with the London Borough of Hounslow's planning department before proceeding with any external works.
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