RSJ cost in R1
RSJs support your new extension or other construction to ensure that your property is structurally sound. They are crucial parts of your building work that mustn't be ignored, and must be installed by a professional.
How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in R1 it ranges from £1640 (London Quality Construction Group Limited based in BR2) to £2600 (Silverland design & build based in BR1).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in R1 by posting a job with HaMuch and we will send it to extension builders in R1.
Estimates for common extension builder jobs in R1;
| Job | Estimate |
| Underpinning a house | £17370 |
| Build a two storey extension | £87805 |
| Build a timber frame extension | £25870 |
| Install a swimming pool | £80870 |
| Cost to build a single storey extension | £47395 |
| Cost to build a side return extension | £36035 |
| Install an RSJ | £2070 |
| Build an outbuilding | £9870 |
| Build a mansard loft conversion | £51870 |
| Cost of a loft conversion | £32529 |
| Build a kitchen extension | £41870 |
| Build a hip to gable loft conversion | £41870 |
| Build a granny annexe | £86870 |
| Build a garden office | £9870 |
| Convert a garage | £15870 |
| Build a new garage | £18370 |
| Build a flat roof extension | £21870 |
| Build a dormer loft conversion | £41870 |
| Lay a concrete foundation | £6120 |
| Convert a bungalow loft | £28870 |
| Basement conversion cost | £36035 |