From £1,904
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,904
From start to finish, your project will be undertaken by one of the family, providing the utmost care and quality of workmanship. We’ll work with...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in TR5 it ranges from £1,904 (Cannon and Son Ltd. based in TR6) to £1,904 (Cannon and Son Ltd. based in TR6).
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 TR5 by posting a job with HaMuch and we will send it to extension builders in TR5.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Truro | £31 | £206 |
| Install An RSJ near Camborne | £28 | £196 |
| Install An RSJ near Newquay | £32 | £230 |
| Install An RSJ near Falmouth | £33 | £220 |
| Install An RSJ near St Ives, Cornwall | £27 | £188 |
| Install An RSJ near St Austell | £38 | £245 |
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 - £17,204

Two storey extension - £87,556

Build a timber frame extension - £25,704

Build a swimming pool - £80,704

Single storey extension - £49,080

Side return extension - £38,170

Install an RSJ - £1,904

Outbuilding - £9,704

Build a Mansard loft conversion - £51,704

Loft conversion - £30,975

Build a kitchen extension - £41,704

Hip to gable loft conversion - £41,704

Granny annexe - £86,704

Garden office - £9,704

Convert a Garage - £15,704

Garage - £18,204

Build a flat roof extension - £21,704

Build a dormer loft conversion - £41,704

Concrete foundations - £5,954

Convert a bungalow loft - £28,704

Convert a basement - £34,170