Birkenhead, Merseyside
Double Storey Extension in Birkenhead
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
£40,800 – £64,600
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 | £4,896 | £7,752 |
| Structural Walls | £6,120 | £9,690 |
| Roof Structure & Covering | £4,080 | £6,460 |
| Windows & Doors | £3,264 | £5,168 |
| Plumbing & Drainage | £3,264 | £5,168 |
| Electrical Installation | £2,448 | £3,876 |
| Plastering & Rendering | £2,448 | £3,876 |
| Flooring | £2,040 | £3,230 |
| Kitchen/Bathroom Fitting | £4,080 | £6,460 |
| Decoration & Finishing | £2,040 | £3,230 |
| Professional Fees | £4,080 | £6,460 |
| Contingency (10%) | £2,040 | £3,230 |
| Total Estimated Cost | £40,800 | £64,600 |
* 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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