Cheapest builders to convert your basement in Spelthorne
Range from the cheapest Basement conversion £35880 (Proxile Solutions Limited based in TW15) to the dearest Basement conversion £37050 (Assent Construction based in Tw15).
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 Spelthorne by posting a job with HaMuch and we will send it to extension builders in Spelthorne.
Estimates for common extension builder jobs in Spelthorne;
| Job | Estimate |
| Underpinning a house | £17410 |
| Build a two storey extension | £87866 |
| Build a timber frame extension | £25910 |
| Install a swimming pool | £80910 |
| Cost to build a single storey extension | £48208 |
| Cost to build a side return extension | £36492 |
| Install an RSJ | £2110 |
| Build an outbuilding | £9910 |
| Build a mansard loft conversion | £51910 |
| Cost of a loft conversion | £32910 |
| Build a kitchen extension | £41910 |
| Build a hip to gable loft conversion | £41910 |
| Build a granny annexe | £86910 |
| Build a garden office | £9910 |
| Convert a garage | £15910 |
| Build a new garage | £18410 |
| Build a flat roof extension | £21910 |
| Build a dormer loft conversion | £41910 |
| Lay a concrete foundation | £6160 |
| Convert a bungalow loft | £28910 |
| Basement conversion cost | £36492 |