Cheapest builders to convert your basement in Swanley
Range from the cheapest Basement conversion £33000 (Domy Building Services Ltd based in DA5) to the dearest Basement conversion £36690 (Alpha Construction Building Company Ltd based in BR5).
Comparing extension builders estimates for a Basement conversion 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 for the cost to convert a basement in Swanley by posting a job with HaMuch and we will send it to extension builders in Swanley.
Estimates for common extension builder jobs in Swanley;
| Job | Estimate |
| Underpinning a house | £17288 |
| Build a two storey extension | £87683 |
| Build a timber frame extension | £25788 |
| Install a swimming pool | £80788 |
| Cost to build a single storey extension | £45770 |
| Cost to build a side return extension | £35120 |
| Install an RSJ | £1988 |
| Build an outbuilding | £9788 |
| Build a mansard loft conversion | £51788 |
| Cost of a loft conversion | £31767 |
| Build a kitchen extension | £41788 |
| Build a hip to gable loft conversion | £41788 |
| Build a granny annexe | £86788 |
| Build a garden office | £9788 |
| Convert a garage | £15788 |
| Build a new garage | £18288 |
| Build a flat roof extension | £21788 |
| Build a dormer loft conversion | £41788 |
| Lay a concrete foundation | £6038 |
| Convert a bungalow loft | £28788 |
| Basement conversion cost | £35120 |