London, Greater London
Loft Conversion in London
A loft conversion transforms unused attic space into a habitable room, offering one of the best returns on investment of any home improvement project.
Estimated Cost
£37,125 – £59,063
Based on 25m² at local rates
6–12 weeks typical duration
Planning permission: Usually not required
Cost Breakdown for Loft Conversion
Estimated costs for a typical 25m² loft conversion project, adjusted for local labour and material rates.
| Category | Low Estimate | High Estimate |
|---|---|---|
| Foundations & Groundworks | £4,455 | £7,088 |
| Structural Walls | £5,569 | £8,859 |
| Roof Structure & Covering | £3,713 | £5,906 |
| Windows & Doors | £2,970 | £4,725 |
| Plumbing & Drainage | £2,970 | £4,725 |
| Electrical Installation | £2,228 | £3,544 |
| Plastering & Rendering | £2,228 | £3,544 |
| Flooring | £1,856 | £2,953 |
| Kitchen/Bathroom Fitting | £3,713 | £5,906 |
| Decoration & Finishing | £1,856 | £2,953 |
| Professional Fees | £3,713 | £5,906 |
| Contingency (10%) | £1,856 | £2,953 |
| Total Estimated Cost | £37,125 | £59,063 |
* Costs are estimates based on regional averages and may vary depending on specification, access, and site conditions. Prices include VAT at 20%.
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