Extension builder estimates (based on hourly rates) to build a single storey extension in BS1
Range from the cheapest single storey extension £42000 (HOMESTAR based in BS7) to the dearest single storey extension £54800 (JM Building Services based in BS4).
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 BS1 by posting a job with HaMuch and we will send it to extension builders in BS1.
Estimates for common extension builder jobs in BS1;
| Job | Estimate |
| Underpinning a house | £17295 |
| Build a two storey extension | £87692 |
| Build a timber frame extension | £25795 |
| Install a swimming pool | £80795 |
| Cost to build a single storey extension | £45898 |
| Cost to build a side return extension | £35192 |
| Install an RSJ | £1995 |
| Build an outbuilding | £9795 |
| Build a mansard loft conversion | £51795 |
| Cost of a loft conversion | £31827 |
| Build a kitchen extension | £41795 |
| Build a hip to gable loft conversion | £41795 |
| Build a granny annexe | £86795 |
| Build a garden office | £9795 |
| Convert a garage | £15795 |
| Build a new garage | £18295 |
| Build a flat roof extension | £21795 |
| Build a dormer loft conversion | £41795 |
| Lay a concrete foundation | £6045 |
| Convert a bungalow loft | £28795 |
| Basement conversion cost | £35192 |