Extension builder estimates (based on hourly rates) to build a single storey extension in WS1
Range from the cheapest single storey extension £29200 (FIVE OAKS BUILDING LTD based in DY4) to the dearest single storey extension £74000 (Holmes Roofing & Cladding based in WS9).
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 WS1 by posting a job with HaMuch and we will send it to extension builders in WS1.
Estimates for common extension builder jobs in WS1;
| Job | Estimate |
| Underpinning a house | £17169 |
| Build a two storey extension | £87504 |
| Build a timber frame extension | £25669 |
| Install a swimming pool | £80669 |
| Cost to build a single storey extension | £43382 |
| Cost to build a side return extension | £33778 |
| Install an RSJ | £1869 |
| Build an outbuilding | £9669 |
| Build a mansard loft conversion | £51669 |
| Cost of a loft conversion | £30648 |
| Build a kitchen extension | £41669 |
| Build a hip to gable loft conversion | £41669 |
| Build a granny annexe | £86669 |
| Build a garden office | £9669 |
| Convert a garage | £15669 |
| Build a flat roof extension | £21669 |
| Build a dormer loft conversion | £41669 |
| Lay a concrete foundation | £5919 |
| Convert a bungalow loft | £28669 |
| Basement conversion cost | £33778 |