Extension builder estimates (based on hourly rates) to build a single storey extension in W4
Range from the cheapest single storey extension £46800 (Arrow Design LTD based in W4) to the dearest single storey extension £66000 (Adrian Design Ltd based in W4).
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 W4 by posting a job with HaMuch and we will send it to extension builders in W4.
Estimates for common extension builder jobs in W4;
| Job | Estimate |
| Underpinning a house | £17436 |
| Build a two storey extension | £87904 |
| Build a timber frame extension | £25936 |
| Install a swimming pool | £80936 |
| Cost to build a single storey extension | £48714 |
| Cost to build a side return extension | £36776 |
| Install an RSJ | £2136 |
| Build an outbuilding | £9936 |
| Build a mansard loft conversion | £51936 |
| Cost of a loft conversion | £33147 |
| Build a kitchen extension | £41936 |
| Build a hip to gable loft conversion | £41936 |
| Build a granny annexe | £86936 |
| Build a garden office | £9936 |
| Convert a garage | £15936 |
| Build a new garage | £18436 |
| Build a flat roof extension | £21936 |
| Build a dormer loft conversion | £41936 |
| Lay a concrete foundation | £6186 |
| Convert a bungalow loft | £28936 |
| Basement conversion cost | £36776 |