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From £1,640
We are a family run Construction Company based in Penzance. We employ over 10 skilled local trade professionals with 2 apprentices as well. Residen...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in St Ives, Cornwall it ranges from £1,640 (TGP Construction based in TR18) to £1,640 (TGP Construction based in TR18).
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 St Ives, Cornwall by posting a job with HaMuch and we will send it to extension builders in St Ives, Cornwall.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near St Ives, Cornwall | £27 | £188 |
| Install An RSJ near Camborne | £28 | £196 |
| Install An RSJ near Falmouth | £33 | £220 |
| Install An RSJ near Truro | £31 | £206 |
| Install An RSJ near Newquay | £32 | £230 |
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 - £16,940

Two storey extension - £87,160

Build a timber frame extension - £25,440

Build a swimming pool - £80,440

Single storey extension - £43,800

Side return extension - £35,200

Install an RSJ - £1,640

Outbuilding - £9,440

Build a Mansard loft conversion - £51,440

Loft conversion - £28,500

Build a kitchen extension - £41,440

Hip to gable loft conversion - £41,440

Granny annexe - £86,440

Garden office - £9,440

Convert a Garage - £15,440

Garage - £17,940

Build a flat roof extension - £21,440

Build a dormer loft conversion - £41,440

Concrete foundations - £5,690

Convert a bungalow loft - £28,440

Convert a basement - £31,200