Extension builder estimates (based on hourly rates) to build a single storey extension in SP3
Range from the cheapest single storey extension £34000 (NHBC based in SP2) to the dearest single storey extension £53040 (Burfitt and Garrett Ltd based in SP7).
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 SP3 by posting a job with HaMuch and we will send it to extension builders in SP3.
Estimates for common extension builder jobs in SP3;
| Job | Estimate |
| Underpinning a house | £17272 |
| Build a two storey extension | £87657 |
| Build a timber frame extension | £25772 |
| Install a swimming pool | £80772 |
| Cost to build a single storey extension | £45430 |
| Cost to build a side return extension | £34930 |
| Install an RSJ | £1972 |
| Build an outbuilding | £9772 |
| Build a mansard loft conversion | £51772 |
| Cost of a loft conversion | £31608 |
| Build a kitchen extension | £41772 |
| Build a hip to gable loft conversion | £41772 |
| Build a granny annexe | £86772 |
| Build a garden office | £9772 |
| Convert a garage | £15772 |
| Build a new garage | £18272 |
| Build a flat roof extension | £21772 |
| Build a dormer loft conversion | £41772 |
| Lay a concrete foundation | £6022 |
| Convert a bungalow loft | £28772 |
| Basement conversion cost | £34930 |