Barnsley, South Yorkshire
Double Storey Extension in Barnsley
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
£39,360 – £62,320
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 | £4,723 | £7,478 |
| Structural Walls | £5,904 | £9,348 |
| Roof Structure & Covering | £3,936 | £6,232 |
| Windows & Doors | £3,149 | £4,986 |
| Plumbing & Drainage | £3,149 | £4,986 |
| Electrical Installation | £2,362 | £3,739 |
| Plastering & Rendering | £2,362 | £3,739 |
| Flooring | £1,968 | £3,116 |
| Kitchen/Bathroom Fitting | £3,936 | £6,232 |
| Decoration & Finishing | £1,968 | £3,116 |
| Professional Fees | £3,936 | £6,232 |
| Contingency (10%) | £1,968 | £3,116 |
| Total Estimated Cost | £39,360 | £62,320 |
* 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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