Extension builder estimates (based on hourly rates) to build a single storey extension in KT12
Range from the cheapest single storey extension £46800 (K & A Construction based in TW16) to the dearest single storey extension £66000 (AMWEB PROPERTY SERVICES based in TW16).
Comparing extension builders estimates for fitting a downstairs toilet 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 to build a single storey extension in KT12 by posting a job with HaMuch and we will send it to extension builders in KT12.
Estimates for common extension builder jobs in KT12;
| Job | Estimate |
| Underpinning a house | £17452 |
| Build a two storey extension | £87928 |
| Build a timber frame extension | £25952 |
| Install a swimming pool | £80952 |
| Cost to build a single storey extension | £49034 |
| Cost to build a side return extension | £36956 |
| Install an RSJ | £2152 |
| Build an outbuilding | £9952 |
| Build a mansard loft conversion | £51952 |
| Cost of a loft conversion | £33297 |
| Build a kitchen extension | £41952 |
| Build a hip to gable loft conversion | £41952 |
| Build a granny annexe | £86952 |
| Build a garden office | £9952 |
| Convert a garage | £15952 |
| Build a new garage | £18452 |
| Build a flat roof extension | £21952 |
| Build a dormer loft conversion | £41952 |
| Lay a concrete foundation | £6202 |
| Convert a bungalow loft | £28952 |
| Basement conversion cost | £36956 |