From £1,896
As London based construction company, we are happy to work on private or commercial projects for individuals, managing companies, main contractors,...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Thornhill it ranges from £1,896 (Toni build ltd based in RM10) to £1,896 (Toni build ltd based in RM10).
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 Thornhill by posting a job with HaMuch and we will send it to extension builders in Thornhill.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Dumfries & Galloway | £20 | £164 |
| Install An RSJ near Dumfries | £20 | £164 |
| Install An RSJ near Kilmarnock | £36 | £271 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,196

Two storey extension - £87,544

Build a timber frame extension - £25,696

Build a swimming pool - £80,696

Single storey extension - £48,920

Side return extension - £38,080

Install an RSJ - £1,896

Outbuilding - £9,696

Build a Mansard loft conversion - £51,696

Loft conversion - £30,900

Build a kitchen extension - £41,696

Hip to gable loft conversion - £41,696

Granny annexe - £86,696

Garden office - £9,696

Convert a Garage - £15,696

Garage - £18,196

Build a flat roof extension - £21,696

Build a dormer loft conversion - £41,696

Concrete foundations - £5,946

Convert a bungalow loft - £28,696

Convert a basement - £34,080