Cheapest builders to convert your basement in N21
Range from the cheapest Basement conversion £31200 (VRS BUILDING based in N18) to the dearest Basement conversion £38400 (Drazhi Builders based in N13).
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 N21 by posting a job with HaMuch and we will send it to extension builders in N21.
Estimates for common extension builder jobs in N21;
| Job | Estimate |
| Underpinning a house | £17376 |
| Build a two storey extension | £87813 |
| Build a timber frame extension | £25876 |
| Install a swimming pool | £80876 |
| Cost to build a single storey extension | £47510 |
| Cost to build a side return extension | £36100 |
| Install an RSJ | £2076 |
| Build an outbuilding | £9876 |
| Build a mansard loft conversion | £51876 |
| Cost of a loft conversion | £32583 |
| Build a kitchen extension | £41876 |
| Build a hip to gable loft conversion | £41876 |
| Build a granny annexe | £86876 |
| Build a garden office | £9876 |
| Convert a garage | £15876 |
| Build a new garage | £18376 |
| Build a flat roof extension | £21876 |
| Build a dormer loft conversion | £41876 |
| Lay a concrete foundation | £6126 |
| Convert a bungalow loft | £28876 |
| Basement conversion cost | £36100 |