Extension builder estimates (based on hourly rates) to build a single storey extension in S25
Range from the cheapest single storey extension £34000 (R Watson Builders based in S43) to the dearest single storey extension £170000 (C S Roofing & Building based in S8).
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 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 | £17585 |
| Build a two storey extension | £88127 |
| Build a timber frame extension | £26085 |
| Install a swimming pool | £81085 |
| Cost to build a single storey extension | £51696 |
| Cost to build a side return extension | £38454 |
| Install an RSJ | £2285 |
| Build an outbuilding | £10085 |
| Build a mansard loft conversion | £52085 |
| Cost of a loft conversion | £34545 |
| Build a kitchen extension | £42085 |
| Build a hip to gable loft conversion | £42085 |
| Build a granny annexe | £87085 |
| Build a garden office | £10085 |
| Convert a garage | £16085 |
| Build a new garage | £18585 |
| Build a flat roof extension | £22085 |
| Build a dormer loft conversion | £42085 |
| Lay a concrete foundation | £6335 |
| Convert a bungalow loft | £29085 |
| Basement conversion cost | £38454 |