Cheapest builders to convert your basement in S25
Range from the cheapest Basement conversion £28500 (R Watson Builders based in S43) to the dearest Basement conversion £105000 (C S Roofing & Building based in S8).
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 S25 by posting a job with HaMuch and we will send it to extension builders in S25.
Estimates for common extension builder jobs in S25;
| Job | Estimate |
| Underpinning a house | £17583 |
| Build a two storey extension | £88124 |
| Build a timber frame extension | £26083 |
| Install a swimming pool | £81083 |
| Cost to build a single storey extension | £51651 |
| Cost to build a side return extension | £38429 |
| Install an RSJ | £2283 |
| Build an outbuilding | £10083 |
| Build a mansard loft conversion | £52083 |
| Cost of a loft conversion | £34524 |
| Build a kitchen extension | £42083 |
| Build a hip to gable loft conversion | £42083 |
| Build a granny annexe | £87083 |
| Build a garden office | £10083 |
| Convert a garage | £16083 |
| Build a new garage | £18583 |
| Build a flat roof extension | £22083 |
| Build a dormer loft conversion | £42083 |
| Lay a concrete foundation | £6333 |
| Convert a bungalow loft | £29083 |
| Basement conversion cost | £38429 |