Birkenhead, Merseyside
Single Storey Extension in Birkenhead
A single storey rear or side extension is one of the most popular home improvements in the UK, adding valuable living space without the complexity of multi-level construction.
Estimated Cost
£23,800 – £37,400
Based on 20m² at local rates
8–14 weeks typical duration
Planning permission: Usually not required
Cost Breakdown for Single Storey Extension
Estimated costs for a typical 20m² single storey project, adjusted for local labour and material rates.
| Category | Low Estimate | High Estimate |
|---|---|---|
| Foundations & Groundworks | £2,856 | £4,488 |
| Structural Walls | £3,570 | £5,610 |
| Roof Structure & Covering | £2,380 | £3,740 |
| Windows & Doors | £1,904 | £2,992 |
| Plumbing & Drainage | £1,904 | £2,992 |
| Electrical Installation | £1,428 | £2,244 |
| Plastering & Rendering | £1,428 | £2,244 |
| Flooring | £1,190 | £1,870 |
| Kitchen/Bathroom Fitting | £2,380 | £3,740 |
| Decoration & Finishing | £1,190 | £1,870 |
| Professional Fees | £2,380 | £3,740 |
| Contingency (10%) | £1,190 | £1,870 |
| Total Estimated Cost | £23,800 | £37,400 |
* 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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