Extension builder estimates (based on hourly rates) to build a single storey extension in SY23
Range from the cheapest single storey extension £38800 (DRAGON CONSTRUCTION T/A based in SY25) to the dearest single storey extension £40400 (SP Coupland Ltd based in SY25).
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 SY23 by posting a job with HaMuch and we will send it to extension builders in SY23.
Estimates for common extension builder jobs in SY23;
| Job | Estimate |
| Underpinning a house | £16980 |
| Build a two storey extension | £87220 |
| Build a timber frame extension | £25480 |
| Install a swimming pool | £80480 |
| Cost to build a single storey extension | £39600 |
| Cost to build a side return extension | £31650 |
| Install an RSJ | £1680 |
| Build an outbuilding | £9480 |
| Build a mansard loft conversion | £51480 |
| Cost of a loft conversion | £28875 |
| Build a kitchen extension | £41480 |
| Build a hip to gable loft conversion | £41480 |
| Build a granny annexe | £86480 |
| Build a garden office | £9480 |
| Convert a garage | £15480 |
| Build a new garage | £17980 |
| Build a flat roof extension | £21480 |
| Build a dormer loft conversion | £41480 |
| Lay a concrete foundation | £5730 |
| Convert a bungalow loft | £28480 |
| Basement conversion cost | £31650 |
Rates for other SY23 trades
Extension Builders in SY23
| Business name | Single storey extension cost |
|---|---|
| SP Coupland Ltd, Sir Ceredigion, SY25 | £40400 |
| DRAGON CONSTRUCTION T/A, , SY25 | £38800 |