South East build costs run at 115% of the UK national average, across councils including Brighton and Hove, Oxford, Reading. A 20m² example at mid-range spec: £85,512–£115,692. Adjust the size and spec below for your project.
England only. Takes about a minute.
| Size | Basic | Mid-range | Premium |
|---|---|---|---|
| 15m² | £44,537–£60,256 | £64,134–£86,769 | £91,846–£124,262 |
| 20m² | £59,383–£80,342 | £85,512–£115,692 | £122,461–£165,683 |
| 30m² | £89,075–£120,513 | £128,268–£173,538 | £183,692–£248,524 |
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.