Extension builder estimates (based on hourly rates) to build a single storey extension in St John
Range from the cheapest single storey extension £46960 (London Craftmasters LTD based in NW8) to the dearest single storey extension £58000 (A1&PM based in W1H).
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 St John by posting a job with HaMuch and we will send it to extension builders in St John.
Estimates for common extension builder jobs in St John;
| Job | Estimate |
| Underpinning a house | £17425 |
| Build a two storey extension | £87888 |
| Build a timber frame extension | £25925 |
| Install a swimming pool | £80925 |
| Cost to build a single storey extension | £48502 |
| Cost to build a side return extension | £36658 |
| Install an RSJ | £2125 |
| Build an outbuilding | £9925 |
| Build a mansard loft conversion | £51925 |
| Cost of a loft conversion | £33048 |
| Build a kitchen extension | £41925 |
| Build a hip to gable loft conversion | £41925 |
| Build a granny annexe | £86925 |
| Build a garden office | £9925 |
| Convert a garage | £15925 |
| Build a new garage | £18425 |
| Build a flat roof extension | £21925 |
| Build a dormer loft conversion | £41925 |
| Lay a concrete foundation | £6175 |
| Convert a bungalow loft | £28925 |
| Basement conversion cost | £36658 |