Extension builder estimates (based on hourly rates) to build a single storey extension in M24
Range from the cheapest single storey extension £29200 (Aquatec Builder based in OL10) to the dearest single storey extension £43440 (Starmore Building and Joinery based in M1).
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 M24 by posting a job with HaMuch and we will send it to extension builders in M24.
Estimates for common extension builder jobs in M24;
| Job | Estimate |
| Underpinning a house | £17028 |
| Build a two storey extension | £87292 |
| Build a timber frame extension | £25528 |
| Install a swimming pool | £80528 |
| Cost to build a single storey extension | £40554 |
| Cost to build a side return extension | £32186 |
| Install an RSJ | £1728 |
| Build an outbuilding | £9528 |
| Build a mansard loft conversion | £51528 |
| Cost of a loft conversion | £29322 |
| Build a kitchen extension | £41528 |
| Build a hip to gable loft conversion | £41528 |
| Build a granny annexe | £86528 |
| Build a garden office | £9528 |
| Convert a garage | £15528 |
| Build a new garage | £18028 |
| Build a flat roof extension | £21528 |
| Build a dormer loft conversion | £41528 |
| Lay a concrete foundation | £5778 |
| Convert a bungalow loft | £28528 |
| Basement conversion cost | £32186 |