Extension builder estimates (based on hourly rates) to build a single storey extension in FY7
Range from the cheapest single storey extension £29200 (Peter Borowski based in LA3) 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 FY7 by posting a job with HaMuch and we will send it to extension builders in FY7.
Estimates for common extension builder jobs in FY7;
| Job | Estimate |
| Underpinning a house | £16995 |
| Build a two storey extension | £87243 |
| Build a timber frame extension | £25495 |
| Install a swimming pool | £80495 |
| Cost to build a single storey extension | £39907 |
| Cost to build a side return extension | £31823 |
| Install an RSJ | £1695 |
| Build an outbuilding | £9495 |
| Build a mansard loft conversion | £51495 |
| Cost of a loft conversion | £29019 |
| Build a kitchen extension | £41495 |
| Build a hip to gable loft conversion | £41495 |
| Build a granny annexe | £86495 |
| Build a garden office | £9495 |
| Convert a garage | £15495 |
| Build a new garage | £17995 |
| Build a flat roof extension | £21495 |
| Build a dormer loft conversion | £41495 |
| Lay a concrete foundation | £5745 |
| Convert a bungalow loft | £28495 |
| Basement conversion cost | £31823 |