Birmingham, West Midlands
Double Storey Extension in Birmingham
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
£45,600 – £72,200
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 | £5,472 | £8,664 |
| Structural Walls | £6,840 | £10,830 |
| Roof Structure & Covering | £4,560 | £7,220 |
| Windows & Doors | £3,648 | £5,776 |
| Plumbing & Drainage | £3,648 | £5,776 |
| Electrical Installation | £2,736 | £4,332 |
| Plastering & Rendering | £2,736 | £4,332 |
| Flooring | £2,280 | £3,610 |
| Kitchen/Bathroom Fitting | £4,560 | £7,220 |
| Decoration & Finishing | £2,280 | £3,610 |
| Professional Fees | £4,560 | £7,220 |
| Contingency (10%) | £2,280 | £3,610 |
| Total Estimated Cost | £45,600 | £72,200 |
* 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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