South West build costs run at 105% of the UK national average, across councils including Bristol, Bath and North East Somerset, Exeter. A 20m² example at mid-range spec: £78,076–£105,632. Adjust the size and spec below for your project.
England only. Takes about a minute.
| Size | Basic | Mid-range | Premium |
|---|---|---|---|
| 15m² | £40,665–£55,017 | £58,557–£79,224 | £83,859–£113,457 |
| 20m² | £54,219–£73,356 | £78,076–£105,632 | £111,812–£151,276 |
| 30m² | £81,329–£110,033 | £117,114–£158,448 | £167,719–£226,913 |
Each council sets its own fees and decision times. See your council’s page for the exact figures.
Cost bands refreshed quarterly from published 2026 UK cost guides.