Range from the cheapest single storey extension £39,000 (Andy's carpets & Vinyl services based in HP12) to the dearest single storey extension £71,000 (Bantry Construction Limited based in HP10).
Comparing extension builders estimates for fitting a downstairs toilet gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to build a single storey extension in High Wycombe by posting a job with HaMuch and we will send it to extension builders in High Wycombe.

"Single storey extension - HIGH WYCOMBE
"Single storey extension side extention with bathroom and two velux windows 5mx3.2m single story rear extention for dinner 2.6m x 3.5 m - HP11
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Single Storey Extension near High Wycombe | £34 | £237 |
| Single Storey Extension near Wycombe | £34 | £234 |
| Single Storey Extension near Hazlemere | £34 | £235 |
| Single Storey Extension near Maidenhead | £36 | £236 |
| Single Storey Extension near Chesham | £36 | £237 |
| Single Storey Extension near Gerrards Cross | £37 | £244 |
| Single Storey Extension near Slough | £36 | £238 |
| Single Storey Extension near Windsor & Maidenhead | £36 | £238 |
| Single Storey Extension near Windsor | £36 | £238 |
| Single Storey Extension near Rickmansworth | £37 | £241 |