From £2,096
Need an Extension Builder in TR11? Cloverfield Construction Ltd has been helping local clients (20 mile radius) with their extension buildering job...
From £1,952
Jackson Developments provides an affordable, quality service for customers across Cornwall.We undertake all aspects of building work and can manage...
From £1,992
Need to find an Extension Builder near you for all your extension buildering work?
Samuel Winn Design & Build provides a local, trusted ext...
From £1,944
Trusted and professional extension builder in TR11. Experienced in all extension buildering work and keeping within budget and on quote. Jo Tracey ...
From £1,984
Need to find an Extension Builder near you for all your extension buildering work?
KPK Builders Ltd provides a local, trusted extension bui...
From £1,760
TR1 Construction Ltd is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles around TR11 ...
From £1,648
SHORE FIX CONSTRUCTION LTD is an established extension buildering business in TR11. We come highly recommended and provide competitive quotes for y...
From £1,832
J C MITCHELL BUILDERS LTD is a trusted extension builder serving customers in TR11 and the surrounding area. Contact us to today to get a competiti...
From £2,016
Rock Construction is a trusted extension builder serving customers in TR11 and the surrounding area. Contact us to today to get a competitive quote...
From £1,744
Experienced extension builder ready to quote for your work. KEAST CONSTRUCTION LTD is the best extension builder in TR11. No obligation free quotes...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in TR11 it ranges from £1,648 (SHORE FIX CONSTRUCTION LTD based in TR12) to £2,096 (Cloverfield Construction Ltd based in TR11).
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 TR11 by posting a job with HaMuch and we will send it to extension builders in TR11.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Falmouth | £33 | £220 |
| 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 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 - £17,197

Two storey extension - £87,545

Build a timber frame extension - £25,697

Build a swimming pool - £80,697

Single storey extension - £48,936

Side return extension - £38,089

Install an RSJ - £1,897

Outbuilding - £9,697

Build a Mansard loft conversion - £51,697

Loft conversion - £30,908

Build a kitchen extension - £41,697

Hip to gable loft conversion - £41,697

Granny annexe - £86,697

Garden office - £9,697

Convert a Garage - £15,697

Garage - £18,197

Build a flat roof extension - £21,697

Build a dormer loft conversion - £41,697

Concrete foundations - £5,947

Convert a bungalow loft - £28,697

Convert a basement - £34,089