Extension builder estimates (based on hourly rates) to build a single storey extension in N3
Range from the cheapest single storey extension £38800 (Apollo Loft Extensions Ltd based in N12) to the dearest single storey extension £66000 (Greenbuild maintenance sevices ltd based in NW4).
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 N3 by posting a job with HaMuch and we will send it to extension builders in N3.
Estimates for common extension builder jobs in N3;
| Job | Estimate |
| Underpinning a house | £17427 |
| Build a two storey extension | £87891 |
| Build a timber frame extension | £25927 |
| Install a swimming pool | £80927 |
| Cost to build a single storey extension | £48541 |
| Cost to build a side return extension | £36679 |
| Install an RSJ | £2127 |
| Build an outbuilding | £9927 |
| Build a mansard loft conversion | £51927 |
| Cost of a loft conversion | £33066 |
| Build a kitchen extension | £41927 |
| Build a hip to gable loft conversion | £41927 |
| Build a granny annexe | £86927 |
| Build a garden office | £9927 |
| Convert a garage | £15927 |
| Build a new garage | £18427 |
| Build a flat roof extension | £21927 |
| Build a dormer loft conversion | £41927 |
| Lay a concrete foundation | £6177 |
| Convert a bungalow loft | £28927 |
| Basement conversion cost | £36679 |