Extension builder estimates (based on hourly rates) to build a single storey extension in FY8
Range from the cheapest single storey extension £30000 (Chesney Construction based in FY4) to the dearest single storey extension £48400 (K&S probuild ltd based in FY1).
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 FY8 by posting a job with HaMuch and we will send it to extension builders in FY8.
Estimates for common extension builder jobs in FY8;
| Job | Estimate |
| Underpinning a house | £16991 |
| Build a two storey extension | £87236 |
| Build a timber frame extension | £25491 |
| Install a swimming pool | £80491 |
| Cost to build a single storey extension | £39811 |
| Cost to build a side return extension | £31769 |
| Install an RSJ | £1691 |
| Build an outbuilding | £9491 |
| Build a mansard loft conversion | £51491 |
| Cost of a loft conversion | £28974 |
| Build a kitchen extension | £41491 |
| Build a hip to gable loft conversion | £41491 |
| Build a granny annexe | £86491 |
| Build a garden office | £9491 |
| Convert a garage | £15491 |
| Build a new garage | £17991 |
| Build a flat roof extension | £21491 |
| Build a dormer loft conversion | £41491 |
| Lay a concrete foundation | £5741 |
| Convert a bungalow loft | £28491 |
| Basement conversion cost | £31769 |