Gloucester, Gloucestershire
Double Storey Extension in Gloucester
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
£47,040 – £74,480
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 | £5,645 | £8,938 |
| Structural Walls | £7,056 | £11,172 |
| Roof Structure & Covering | £4,704 | £7,448 |
| Windows & Doors | £3,763 | £5,958 |
| Plumbing & Drainage | £3,763 | £5,958 |
| Electrical Installation | £2,822 | £4,469 |
| Plastering & Rendering | £2,822 | £4,469 |
| Flooring | £2,352 | £3,724 |
| Kitchen/Bathroom Fitting | £4,704 | £7,448 |
| Decoration & Finishing | £2,352 | £3,724 |
| Professional Fees | £4,704 | £7,448 |
| Contingency (10%) | £2,352 | £3,724 |
| Total Estimated Cost | £47,040 | £74,480 |
* 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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