Newcastle, Tyne and Wear
Double Storey Extension in Newcastle
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
£41,760 – £66,120
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 | £5,011 | £7,934 |
| Structural Walls | £6,264 | £9,918 |
| Roof Structure & Covering | £4,176 | £6,612 |
| Windows & Doors | £3,341 | £5,290 |
| Plumbing & Drainage | £3,341 | £5,290 |
| Electrical Installation | £2,506 | £3,967 |
| Plastering & Rendering | £2,506 | £3,967 |
| Flooring | £2,088 | £3,306 |
| Kitchen/Bathroom Fitting | £4,176 | £6,612 |
| Decoration & Finishing | £2,088 | £3,306 |
| Professional Fees | £4,176 | £6,612 |
| Contingency (10%) | £2,088 | £3,306 |
| Total Estimated Cost | £41,760 | £66,120 |
* 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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