Range from the cheapest Side return extension £39,790 (Aylaa Exclusive based in EC1A) to the dearest Side return extension £40,870 (Londoner Building Ltd. based in EC1A).
Comparing extension builders estimates for Side return extension 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 for a side return extention by posting your job to extension builders in City Of London.

"Side return extension 12smq roughly Open up wall to garden and install big door window Demolish lean-to and original victorian toilet"
E10
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Side Return Extension near Islington | £39 | £237 |
| Side Return Extension near London | £39 | £237 |
| Side Return Extension near Bethnal Green | £39 | £236 |
| Side Return Extension near Lambeth | £38 | £237 |
| Side Return Extension near Hackney | £39 | £237 |
| Side Return Extension near Camden Town | £38 | £238 |
| Side Return Extension near Belgravia | £38 | £237 |
| Side Return Extension near Camberwell | £38 | £237 |
| Side Return Extension near Chelsea | £38 | £238 |
| Side Return Extension near Kensington | £38 | £238 |