Extension builder estimates (based on hourly rates) to build a single storey extension in Sefton
Range from the cheapest single storey extension £32400 (Priwood Construction Ltd based in L21) to the dearest single storey extension £52000 (Aurora Building company ltd based in L12).
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 Sefton by posting a job with HaMuch and we will send it to extension builders in Sefton.
Estimates for common extension builder jobs in Sefton;
| Job | Estimate |
| Underpinning a house | £17034 |
| Build a two storey extension | £87301 |
| Build a timber frame extension | £25534 |
| Install a swimming pool | £80534 |
| Cost to build a single storey extension | £40685 |
| Cost to build a side return extension | £32260 |
| Install an RSJ | £1734 |
| Build an outbuilding | £9534 |
| Build a mansard loft conversion | £51534 |
| Cost of a loft conversion | £29384 |
| Build a kitchen extension | £41534 |
| Build a hip to gable loft conversion | £41534 |
| Build a granny annexe | £86534 |
| Build a garden office | £9534 |
| Convert a garage | £15534 |
| Build a flat roof extension | £21534 |
| Build a dormer loft conversion | £41534 |
| Lay a concrete foundation | £5784 |
| Convert a bungalow loft | £28534 |
| Basement conversion cost | £32260 |