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Single and double storey rear and side extensions. Full planning and build from foundations to roof. Covering all London boroughs.
Find a builder →Velux, dormer, hip-to-gable and mansard loft conversions. Planning permission and structural work included.
Find a builder →Full house refurbishments, kitchen and bathroom strip-outs, internal remodelling, basement conversions.
Find a builder →Office refurbishments, shopfits, commercial building works, retail units across London.
Find a builder →RSJ steel beam installation, load-bearing wall removal, underpinning, party wall works.
Find a builder →Single dwelling new builds, garages, garden studios, annexes and outbuildings across London.
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 London 2026. Actual costs vary by job complexity, specification, borough, and access. Always get multiple quotes.
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London's housing market creates unique demand for building work. With property prices among the highest in the UK and planning restrictions often preventing outright moves, extending and converting is the preferred strategy for most London homeowners. The borough planning systems across London's 32 boroughs vary significantly — what is permitted development in Enfield may require full planning permission in Richmond or Hackney. Understanding your local borough's rules is critical before starting any building work.
The capital's diverse housing stock presents challenges and opportunities. Victorian and Edwardian terrace houses dominate inner London, and their brick and timber-frame construction is well suited to loft conversions and rear extensions. However, many sit in conservation areas or have Article 4 Directions that remove permitted development rights — requiring full planning applications even for modest works. 1930s semis and post-war stock in outer boroughs like Enfield, Barnet, and Ealing are typically easier to extend under permitted development.
When choosing a builder in London, always insist on public liability insurance of at least £2 million, a detailed written contract that specifies materials and milestones, and a payment schedule tied to completion of defined stages (never pay the full amount upfront). For projects over £25,000, consider using an architect or project manager to oversee the build and protect your interests. GetQuickHelp connects you with experienced, verified builders across all London boroughs.
Free to post. No subscription. No hidden fees. Experienced builders across all London boroughs — usually responding within hours.