Colchester, Essex
Single Storey Extension in Colchester
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
£30,240 – £47,520
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 | £3,629 | £5,702 |
| Structural Walls | £4,536 | £7,128 |
| Roof Structure & Covering | £3,024 | £4,752 |
| Windows & Doors | £2,419 | £3,802 |
| Plumbing & Drainage | £2,419 | £3,802 |
| Electrical Installation | £1,814 | £2,851 |
| Plastering & Rendering | £1,814 | £2,851 |
| Flooring | £1,512 | £2,376 |
| Kitchen/Bathroom Fitting | £3,024 | £4,752 |
| Decoration & Finishing | £1,512 | £2,376 |
| Professional Fees | £3,024 | £4,752 |
| Contingency (10%) | £1,512 | £2,376 |
| Total Estimated Cost | £30,240 | £47,520 |
* 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 Single Storey in Colchester
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 QuoteSingle Storey Extension Costs in Nearby Cities
Compare single storey costs in cities near Colchester.