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Single and double storey rear and side extensions across West London, from Shepherd's Bush to Kensington. Conservation area experience included.
Find a builder →Velux, dormer, hip-to-gable, and mansard loft conversions. West London period properties converted sympathetically with planning guidance available.
Find a builder →Full house refurbishments and internal remodelling. High-specification finishes for West London's premium buyer market in W1–W14 and TW postcodes.
Find a builder →Office refurbishments and shopfits across West London including White City, Westfield area, and the W1 commercial district.
Find a builder →RSJ steel beam installations, load-bearing wall removals, and underpinning for West London's Victorian and Edwardian property stock.
Find a builder →New build projects, garage conversions, and garden studios. Basement conversions popular in high-value Notting Hill and Holland Park streets.
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 West London 2026. Actual costs vary by job complexity, specification, and location. Always get multiple quotes.
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West London covers some of the most valuable residential streets in the country. Notting Hill, Holland Park, and Kensington sit among the highest-priced property markets in Europe, meaning well-executed extensions and loft conversions can add hundreds of thousands of pounds to a property's value. The housing stock is predominantly Victorian and Edwardian terraces and semi-detached homes, with a significant proportion of mansion flats and period conversions — all of which lend themselves well to rear extensions, loft conversions, and basement work.
Conservation areas are extensive across the Royal Borough of Kensington and Chelsea and parts of the London Borough of Hammersmith and Fulham. Permitted Development Rights are often restricted or removed in these areas, meaning even modest extensions may require a full planning application. Builders with experience of working in conservation areas and with listed properties are essential for many West London projects. Always confirm planning requirements before committing to any design.
Shepherd's Bush, White City, and parts of Acton offer more affordable entry points where buyers regularly extend to maximise space rather than move. The proximity to Westfield and strong transport links make these areas popular with families extending ground-floor living space with open-plan kitchen-dining rooms. When hiring a builder anywhere in West London, confirm they carry public liability insurance, take a reasonable payment schedule tied to project milestones, and provide a written contract before any work starts.
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