Extension builder estimates (based on hourly rates) to build a single storey extension in SY18
Range from the cheapest single storey extension £35600 (SDW CONSTRUCTION LTD based in SY15) 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 SY18 by posting a job with HaMuch and we will send it to extension builders in SY18.
Estimates for common extension builder jobs in SY18;
| Job | Estimate |
| Underpinning a house | £16913 |
| Build a two storey extension | £87119 |
| Build a timber frame extension | £25413 |
| Install a swimming pool | £80413 |
| Cost to build a single storey extension | £38256 |
| Cost to build a side return extension | £30894 |
| Install an RSJ | £1613 |
| Build an outbuilding | £9413 |
| Build a mansard loft conversion | £51413 |
| Cost of a loft conversion | £28245 |
| Build a kitchen extension | £41413 |
| Build a hip to gable loft conversion | £41413 |
| Build a granny annexe | £86413 |
| Build a garden office | £9413 |
| Convert a garage | £15413 |
| Build a new garage | £17913 |
| Build a flat roof extension | £21413 |
| Build a dormer loft conversion | £41413 |
| Lay a concrete foundation | £5663 |
| Convert a bungalow loft | £28413 |
| Basement conversion cost | £30894 |
Rates for other SY18 trades
Extension Builders in SY18
| Business name | Single storey extension cost |
|---|---|
| EVABUILD LIMITED, , SY16 | £37200 |
| SDW CONSTRUCTION LTD, , SY15 | £35600 |
| Cherry Build Limited, Llandrindod Wells, LD1 | £39280 |
| DRAGON CONSTRUCTION T/A, , SY25 | £38800 |
| SP Coupland Ltd, Sir Ceredigion, SY25 | £40400 |