Extension builder estimates (based on hourly rates) to build a single storey extension in SE20
Range from the cheapest single storey extension £42000 (Livo builders based in Br3) to the dearest single storey extension £50000 (Psd buildingservices based in CR0).
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 SE20 by posting a job with HaMuch and we will send it to extension builders in SE20.
Estimates for common extension builder jobs in SE20;
| Job | Estimate |
| Underpinning a house | £17371 |
| Build a two storey extension | £87807 |
| Build a timber frame extension | £25871 |
| Install a swimming pool | £80871 |
| Cost to build a single storey extension | £47427 |
| Cost to build a side return extension | £36053 |
| Install an RSJ | £2071 |
| Build an outbuilding | £9871 |
| Build a mansard loft conversion | £51871 |
| Cost of a loft conversion | £32544 |
| Build a kitchen extension | £41871 |
| Build a hip to gable loft conversion | £41871 |
| Build a granny annexe | £86871 |
| Build a garden office | £9871 |
| Convert a garage | £15871 |
| Build a new garage | £18371 |
| Build a flat roof extension | £21871 |
| Build a dormer loft conversion | £41871 |
| Lay a concrete foundation | £6121 |
| Convert a bungalow loft | £28871 |
| Basement conversion cost | £36053 |