Extension builder estimates (based on hourly rates) to build a single storey extension in BN3
Range from the cheapest single storey extension £43440 (Black Olive Construction Ltd based in BN1) to the dearest single storey extension £90000 (A.M General Building Ltd based in BN2).
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 BN3 by posting a job with HaMuch and we will send it to extension builders in BN3.
Estimates for common extension builder jobs in BN3;
| Job | Estimate |
| Underpinning a house | £17369 |
| Build a two storey extension | £87803 |
| Build a timber frame extension | £25869 |
| Install a swimming pool | £80869 |
| Cost to build a single storey extension | £47376 |
| Cost to build a side return extension | £36024 |
| Install an RSJ | £2069 |
| Build an outbuilding | £9869 |
| Build a mansard loft conversion | £51869 |
| Cost of a loft conversion | £32520 |
| Build a kitchen extension | £41869 |
| Build a hip to gable loft conversion | £41869 |
| Build a granny annexe | £86869 |
| Build a garden office | £9869 |
| Convert a garage | £15869 |
| Build a flat roof extension | £21869 |
| Build a dormer loft conversion | £41869 |
| Lay a concrete foundation | £6119 |
| Convert a bungalow loft | £28869 |
| Basement conversion cost | £36024 |