Extension builder estimates (based on hourly rates) to build a single storey extension in M1
Range from the cheapest single storey extension £41040 (Guardian Developments (Wall Removal Specialist) based in M3) to the dearest single storey extension £58000 (Transform Constructions Ltd based in M25).
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 M1 by posting a job with HaMuch and we will send it to extension builders in M1.
Estimates for common extension builder jobs in M1;
| Job | Estimate |
| Underpinning a house | £17163 |
| Build a two storey extension | £87495 |
| Build a timber frame extension | £25663 |
| Install a swimming pool | £80663 |
| Cost to build a single storey extension | £43267 |
| Cost to build a side return extension | £33713 |
| Install an RSJ | £1863 |
| Build an outbuilding | £9663 |
| Build a mansard loft conversion | £51663 |
| Cost of a loft conversion | £30594 |
| Build a kitchen extension | £41663 |
| Build a hip to gable loft conversion | £41663 |
| Build a granny annexe | £86663 |
| Build a garden office | £9663 |
| Convert a garage | £15663 |
| Build a flat roof extension | £21663 |
| Build a dormer loft conversion | £41663 |
| Lay a concrete foundation | £5913 |
| Convert a bungalow loft | £28663 |
| Basement conversion cost | £33713 |