Guildford, Surrey
Double Storey Extension in Guildford
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
£61,440 – £97,280
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 | £7,373 | £11,674 |
| Structural Walls | £9,216 | £14,592 |
| Roof Structure & Covering | £6,144 | £9,728 |
| Windows & Doors | £4,915 | £7,782 |
| Plumbing & Drainage | £4,915 | £7,782 |
| Electrical Installation | £3,686 | £5,837 |
| Plastering & Rendering | £3,686 | £5,837 |
| Flooring | £3,072 | £4,864 |
| Kitchen/Bathroom Fitting | £6,144 | £9,728 |
| Decoration & Finishing | £3,072 | £4,864 |
| Professional Fees | £6,144 | £9,728 |
| Contingency (10%) | £3,072 | £4,864 |
| Total Estimated Cost | £61,440 | £97,280 |
* Costs are estimates based on regional averages and may vary depending on specification, access, and site conditions. Prices include VAT at 20%.
Frequently Asked Questions
Get an Accurate Quote for Your Double Storey in Guildford
These are estimated costs based on regional averages. For a personalised, expert-backed quote tailored to your specific project, use our free quote calculator.
Get Your Free QuoteDouble Storey Extension Costs in Nearby Cities
Compare double storey costs in cities near Guildford.