Extension builder estimates (based on hourly rates) to build a single storey extension in BR4
Range from the cheapest single storey extension £34000 (Bespoke Builders Beckenham based in BR3) to the dearest single storey extension £48720 (Gables & Co based in BR4).
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 BR4 by posting a job with HaMuch and we will send it to extension builders in BR4.
Estimates for common extension builder jobs in BR4;
| Job | Estimate |
| Underpinning a house | £17292 |
| Build a two storey extension | £87688 |
| Build a timber frame extension | £25792 |
| Install a swimming pool | £80792 |
| Cost to build a single storey extension | £45846 |
| Cost to build a side return extension | £35164 |
| Install an RSJ | £1992 |
| Build an outbuilding | £9792 |
| Build a mansard loft conversion | £51792 |
| Cost of a loft conversion | £31803 |
| Build a kitchen extension | £41792 |
| Build a hip to gable loft conversion | £41792 |
| Build a granny annexe | £86792 |
| Build a garden office | £9792 |
| Convert a garage | £15792 |
| Build a new garage | £18292 |
| Build a flat roof extension | £21792 |
| Build a dormer loft conversion | £41792 |
| Lay a concrete foundation | £6042 |
| Convert a bungalow loft | £28792 |
| Basement conversion cost | £35164 |