Extension builder estimates (based on hourly rates) to build a single storey extension in Outer London
Range from the cheapest single storey extension £42000 (Total Home Refurbishments Ltd based in SE13) to the dearest single storey extension £48880 (Island design & Construction Ltd based in E14).
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 Outer London by posting a job with HaMuch and we will send it to extension builders in Outer London.
Estimates for common extension builder jobs in Outer London;
| Job | Estimate |
| Underpinning a house | £17383 |
| Build a two storey extension | £87825 |
| Build a timber frame extension | £25883 |
| Install a swimming pool | £80883 |
| Cost to build a single storey extension | £47664 |
| Cost to build a side return extension | £36186 |
| Install an RSJ | £2083 |
| Build an outbuilding | £9883 |
| Build a mansard loft conversion | £51883 |
| Cost of a loft conversion | £32655 |
| Build a kitchen extension | £41883 |
| Build a hip to gable loft conversion | £41883 |
| Build a granny annexe | £86883 |
| Build a garden office | £9883 |
| Convert a garage | £15883 |
| Build a new garage | £18383 |
| Build a flat roof extension | £21883 |
| Build a dormer loft conversion | £41883 |
| Lay a concrete foundation | £6133 |
| Convert a bungalow loft | £28883 |
| Basement conversion cost | £36186 |