Extensions cost in London
2026 prices for Greater London · London
Extensions in London typically costs between £38,500 and £153,500, with most homeowners landing near £96,000. Local pricing sits about 28% above the UK average. Labour rates, parking and permit costs, and restricted access on terraced and flat conversions push London well above the national average.
£38,500 – £153,500
UK average £2,200 per m² · London index 128
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Extensions prices in London by finish level
| FINISH LEVEL | LONDON COST | WHAT'S INCLUDED |
|---|---|---|
| Budget | £38,500 – £57,500 | Entry-level materials, existing layout retained |
| Mid-range | £55,500 – £83,500 | Better fittings, some layout change |
| Premium | £75,000 – £112,500 | High-specification materials and full redesign |
£52,800
About 55% of a typical London job, at London day rates.
£43,200
Materials pricing is broadly national — this is where specification, not location, drives your total.
What affects extensions cost in London
Everything from Georgian townhouses to post-war blocks. Party wall agreements, restricted parking, permit skips and borough-specific Article 4 directions all add cost and time.
- Drainage runs needing diversion
- Party wall agreements with neighbours
- Poor ground conditions requiring deeper foundations
Rules in London
Building control and planning applications for extensions work in London go through your London borough council. Confirm before booking whether your property sits in a conservation area, is listed, or is covered by an Article 4 direction — each removes permitted development rights and changes the approval route.
Serving N, E, SE, SW, W, NW and the surrounding Greater London area.
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