Builders Prices in London — How Much Does It Cost? (2026)
Local price ranges for builders in London, including what affects costs and tips to get the best deal.
London pricing
London prices are typically 20–40% above the national average due to higher operating costs and demand. Budget accordingly when requesting quotes.
Always get at least 3 quotes from local providers before committing.
| Service | UK Typical Price | Unit | Notes |
|---|---|---|---|
| Day rate (skilled tradesperson) | £150–£300(+20–40% in London) | per day | — |
| Kitchen extension (medium) | £20,000–£40,000(+20–40% in London) | fixed | — |
| Loft conversion (dormer) | £35,000–£55,000(+20–40% in London) | fixed | — |
| Single-storey rear extension | £20,000–£35,000(+20–40% in London) | fixed | — |
| Full house renovation | £500–£1,200(+20–40% in London) | per m² | — |
| New build (per m²) | £1,500–£3,000(+20–40% in London) | per m² | — |
| Garage conversion | £8,000–£20,000(+20–40% in London) | fixed | — |
* London prices are 20–40% above the national average due to higher operating costs and demand. Add the indicated premium to estimate local costs.
What affects builders prices in London?
- Location (London/South East 30–50% premium)
- Specification and materials chosen
- Project size and complexity
- Planning permission requirements
- Structural engineer and architect fees
- VAT (20% on most building work)
How to get the best builders price in London
- 1Get 3 quotes from FMB or NHBC registered builders
- 2Avoid cash-only contractors — get a contract and VAT invoice
- 3Use staged payments tied to project milestones
- 4Have detailed drawings ready before requesting quotes
- 5Build contingency of 10–20% into your budget
Builders prices in other cities
Frequently asked questions
How much does a builder cost in London?
Builders in London typically charge 20–40% above the national average due to higher operating costs and demand compared to the UK average. A single-storey rear extension typically costs £20,000–£35,000. A larger kitchen-diner extension can reach £40,000+. Costs vary significantly by location, specification, and size.
How much does a loft conversion cost?
A dormer loft conversion typically costs £35,000–£55,000. A simpler Velux conversion starts around £20,000–£30,000. London prices are typically 30–50% higher.
Should I get a contract with my builder?
Absolutely. Always get a written contract specifying scope, timeline, payment schedule, and what happens if costs overrun. The JCT Minor Works contract is a suitable template for smaller projects.
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