Extension builder estimates (based on hourly rates) to build a single storey extension in B1
Range from the cheapest single storey extension £34000 (A45 Fencing & Landscapes 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 B1 by posting a job with HaMuch and we will send it to extension builders in B1.
Estimates for common extension builder jobs in B1;
| Job | Estimate |
| Underpinning a house | £17127 |
| Build a two storey extension | £87440 |
| Build a timber frame extension | £25627 |
| Install a swimming pool | £80627 |
| Cost to build a single storey extension | £42531 |
| Cost to build a side return extension | £33299 |
| Install an RSJ | £1827 |
| Build an outbuilding | £9627 |
| Build a mansard loft conversion | £51627 |
| Cost of a loft conversion | £30249 |
| Build a kitchen extension | £41627 |
| Build a hip to gable loft conversion | £41627 |
| Build a granny annexe | £86627 |
| Build a garden office | £9627 |
| Convert a garage | £15627 |
| Build a new garage | £18127 |
| Build a flat roof extension | £21627 |
| Build a dormer loft conversion | £41627 |
| Lay a concrete foundation | £5877 |
| Convert a bungalow loft | £28627 |
| Basement conversion cost | £33299 |