Extension builder estimates (based on hourly rates) to build a single storey extension in Portsmo
Range from the cheapest single storey extension £42000 (Build Light Group based in PO3) to the dearest single storey extension £58000 (Jewer & Son based in PO2).
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 Portsmo by posting a job with HaMuch and we will send it to extension builders in Portsmo.
Estimates for common extension builder jobs in Portsmo;
| Job | Estimate |
| Underpinning a house | £17300 |
| Build a two storey extension | £87700 |
| Build a timber frame extension | £25800 |
| Install a swimming pool | £80800 |
| Cost to build a single storey extension | £46000 |
| Cost to build a side return extension | £35250 |
| Install an RSJ | £2000 |
| Build an outbuilding | £9800 |
| Build a mansard loft conversion | £51800 |
| Cost of a loft conversion | £31875 |
| Build a kitchen extension | £41800 |
| Build a hip to gable loft conversion | £41800 |
| Build a granny annexe | £86800 |
| Build a garden office | £9800 |
| Convert a garage | £15800 |
| Build a new garage | £18300 |
| Build a flat roof extension | £21800 |
| Build a dormer loft conversion | £41800 |
| Lay a concrete foundation | £6050 |
| Convert a bungalow loft | £28800 |
| Basement conversion cost | £35250 |