Extension builder estimates (based on hourly rates) to build a single storey extension in Whitehall
Range from the cheapest single storey extension £13200 (London Design And Build based in SW1A) to the dearest single storey extension £48880 (Adamko Dry Lining London based in WC2N).
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 Whitehall by posting a job with HaMuch and we will send it to extension builders in Whitehall.
Estimates for common extension builder jobs in Whitehall;
| Job | Estimate |
| Underpinning a house | £17334 |
| Build a two storey extension | £87751 |
| Build a timber frame extension | £25834 |
| Install a swimming pool | £80834 |
| Cost to build a single storey extension | £46685 |
| Cost to build a side return extension | £35635 |
| Install an RSJ | £2034 |
| Build an outbuilding | £9834 |
| Build a mansard loft conversion | £51834 |
| Cost of a loft conversion | £32196 |
| Build a kitchen extension | £41834 |
| Build a hip to gable loft conversion | £41834 |
| Build a granny annexe | £86834 |
| Build a garden office | £9834 |
| Convert a garage | £15834 |
| Build a new garage | £18334 |
| Build a flat roof extension | £21834 |
| Build a dormer loft conversion | £41834 |
| Lay a concrete foundation | £6084 |
| Convert a bungalow loft | £28834 |
| Basement conversion cost | £35635 |