Extension builder estimates (based on hourly rates) to build a single storey extension in N15
Range from the cheapest single storey extension £36400 (ADD CONSTRUCTION (LONDON) LTD based in N15) to the dearest single storey extension £48880 (Unique Design Projects Ltd based in N15).
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 N15 by posting a job with HaMuch and we will send it to extension builders in N15.
Estimates for common extension builder jobs in N15;
| Job | Estimate |
| Underpinning a house | £17352 |
| Build a two storey extension | £87778 |
| Build a timber frame extension | £25852 |
| Install a swimming pool | £80852 |
| Cost to build a single storey extension | £47043 |
| Cost to build a side return extension | £35837 |
| Install an RSJ | £2052 |
| Build an outbuilding | £9852 |
| Build a mansard loft conversion | £51852 |
| Cost of a loft conversion | £32364 |
| Build a kitchen extension | £41852 |
| Build a hip to gable loft conversion | £41852 |
| Build a granny annexe | £86852 |
| Build a garden office | £9852 |
| Convert a garage | £15852 |
| Build a new garage | £18352 |
| Build a flat roof extension | £21852 |
| Build a dormer loft conversion | £41852 |
| Lay a concrete foundation | £6102 |
| Convert a bungalow loft | £28852 |
| Basement conversion cost | £35837 |