Derby, Derbyshire
Double Storey Extension in Derby
A double storey extension adds significant space on two levels, making it cost-effective per square metre compared to two separate single storey extensions.
Estimated Cost
£43,200 – £68,400
Based on 40m² at local rates
12–20 weeks typical duration
Planning permission: Usually required
Cost Breakdown for Double Storey Extension
Estimated costs for a typical 40m² double storey project, adjusted for local labour and material rates.
| Category | Low Estimate | High Estimate |
|---|---|---|
| Foundations & Groundworks | £5,184 | £8,208 |
| Structural Walls | £6,480 | £10,260 |
| Roof Structure & Covering | £4,320 | £6,840 |
| Windows & Doors | £3,456 | £5,472 |
| Plumbing & Drainage | £3,456 | £5,472 |
| Electrical Installation | £2,592 | £4,104 |
| Plastering & Rendering | £2,592 | £4,104 |
| Flooring | £2,160 | £3,420 |
| Kitchen/Bathroom Fitting | £4,320 | £6,840 |
| Decoration & Finishing | £2,160 | £3,420 |
| Professional Fees | £4,320 | £6,840 |
| Contingency (10%) | £2,160 | £3,420 |
| Total Estimated Cost | £43,200 | £68,400 |
* 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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