Extension builder estimates (based on hourly rates) to build a single storey extension in Northampton
Range from the cheapest single storey extension £35600 (GW BUILDERS based in NN2) to the dearest single storey extension £45200 (The Builders - Northampton Limited based in NN4).
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 Northampton by posting a job with HaMuch and we will send it to extension builders in Northampton.
Estimates for common extension builder jobs in Northampton;
| Job | Estimate |
| Underpinning a house | £17102 |
| Build a two storey extension | £87403 |
| Build a timber frame extension | £25602 |
| Install a swimming pool | £80602 |
| Cost to build a single storey extension | £42038 |
| Cost to build a side return extension | £33022 |
| Install an RSJ | £1802 |
| Build an outbuilding | £9602 |
| Build a mansard loft conversion | £51602 |
| Cost of a loft conversion | £30018 |
| Build a kitchen extension | £41602 |
| Build a hip to gable loft conversion | £41602 |
| Build a granny annexe | £86602 |
| Build a garden office | £9602 |
| Convert a garage | £15602 |
| Build a flat roof extension | £21602 |
| Build a dormer loft conversion | £41602 |
| Lay a concrete foundation | £5852 |
| Convert a bungalow loft | £28602 |
| Basement conversion cost | £33022 |