Range from the cheapest single storey extension £51,800 (Pillar Contractors Ltd based in W1K) to the dearest single storey extension £53,880 (Guildon LTD based in w1b).
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 City Of Westminster by posting a job with HaMuch and we will send it to extension builders in City Of Westminster.

"Single storey extension"
SW18
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Single Storey Extension near London | £39 | £237 |
| Single Storey Extension near Camden Town | £38 | £238 |
| Single Storey Extension near Belgravia | £38 | £237 |
| Single Storey Extension near Chelsea | £38 | £238 |
| Single Storey Extension near Lambeth | £38 | £237 |
| Single Storey Extension near Kensington | £38 | £238 |
| Single Storey Extension near Islington | £39 | £237 |
| Single Storey Extension near Fulham | £38 | £238 |
| Single Storey Extension near Camberwell | £38 | £237 |
| Single Storey Extension near Bethnal Green | £39 | £236 |