London · London · 2026 Prices

How much does a loft conversion cost in London?

The average cost of a loft conversion in London ranges from £24,000 to £78,000, with most homeowners paying around £48,000. Prices include VAT.

Loft Conversion cost summary — London

Budget

£24,000

Average

£48,000

Premium

£78,000

Typical timeframe: 6-12 weeks. Prices are estimates for London and may vary.

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What affects the cost of a loft conversion in London?

1

Type (Velux, dormer, mansard, hip-to-gable)

2

Staircase location

3

En-suite bathroom

4

Structural reinforcement

5

Planning permission

6

Building regulations

Related costs in London

House Extension

£24,000 – £96,000

New Roof

£6,000 – £18,000

Bathroom Renovation

£4,800 – £18,000

Plastering

£360 – £1,200

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