Extension builder estimates (based on hourly rates) to build a single storey extension in SL3
Range from the cheapest single storey extension £47120 (Morpheus Gym Design based in SL4) to the dearest single storey extension £49360 (GDC Design & Build based in TW19).
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 SL3 by posting a job with HaMuch and we will send it to extension builders in SL3.
Estimates for common extension builder jobs in SL3;
| Job | Estimate |
| Underpinning a house | £17404 |
| Build a two storey extension | £87856 |
| Build a timber frame extension | £25904 |
| Install a swimming pool | £80904 |
| Cost to build a single storey extension | £48080 |
| Cost to build a side return extension | £36420 |
| Install an RSJ | £2104 |
| Build an outbuilding | £9904 |
| Build a mansard loft conversion | £51904 |
| Cost of a loft conversion | £32850 |
| Build a kitchen extension | £41904 |
| Build a hip to gable loft conversion | £41904 |
| Build a granny annexe | £86904 |
| Build a garden office | £9904 |
| Convert a garage | £15904 |
| Build a new garage | £18404 |
| Build a flat roof extension | £21904 |
| Build a dormer loft conversion | £41904 |
| Lay a concrete foundation | £6154 |
| Convert a bungalow loft | £28904 |
| Basement conversion cost | £36420 |