Extension builder estimates (based on hourly rates) to build a single storey extension in B23
Range from the cheapest single storey extension £30000 (J s building & maintenance services limited based in B26) to the dearest single storey extension £66000 (TG Building Services & Son based in B71).
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 B23 by posting a job with HaMuch and we will send it to extension builders in B23.
Estimates for common extension builder jobs in B23;
| Job | Estimate |
| Underpinning a house | £17089 |
| Build a two storey extension | £87383 |
| Build a timber frame extension | £25589 |
| Install a swimming pool | £80589 |
| Cost to build a single storey extension | £41776 |
| Cost to build a side return extension | £32874 |
| Install an RSJ | £1789 |
| Build an outbuilding | £9589 |
| Build a mansard loft conversion | £51589 |
| Cost of a loft conversion | £29895 |
| Build a kitchen extension | £41589 |
| Build a hip to gable loft conversion | £41589 |
| Build a granny annexe | £86589 |
| Build a garden office | £9589 |
| Convert a garage | £15589 |
| Build a new garage | £18089 |
| Build a flat roof extension | £21589 |
| Build a dormer loft conversion | £41589 |
| Lay a concrete foundation | £5839 |
| Convert a bungalow loft | £28589 |
| Basement conversion cost | £32874 |