Cheapest builders to convert your basement in S9
Range from the cheapest Basement conversion £29400 (Fairleigh Construction Ltd based in S60) 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 S9 by posting a job with HaMuch and we will send it to extension builders in S9.
Estimates for common extension builder jobs in S9;
| Job | Estimate |
| Underpinning a house | £17607 |
| Build a two storey extension | £88160 |
| Build a timber frame extension | £26107 |
| Install a swimming pool | £81107 |
| Cost to build a single storey extension | £52131 |
| Cost to build a side return extension | £38699 |
| Install an RSJ | £2307 |
| Build an outbuilding | £10107 |
| Build a mansard loft conversion | £52107 |
| Cost of a loft conversion | £34749 |
| Build a kitchen extension | £42107 |
| Build a hip to gable loft conversion | £42107 |
| Build a granny annexe | £87107 |
| Build a garden office | £10107 |
| Convert a garage | £16107 |
| Build a flat roof extension | £22107 |
| Build a dormer loft conversion | £42107 |
| Lay a concrete foundation | £6357 |
| Convert a bungalow loft | £29107 |
| Basement conversion cost | £38699 |