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Relax... you have found a reliable extension builder in St Blaise. BUILDMARK BUILDERS is a friendly and reliable company based in St Blaise who con...
SANDSTONE BUILDERS T/A is a trusted extension builder serving customers in St Blaise and the surrounding area. Contact us to today to get a competi...
From £2,288
Need an Extension Builder in St Blaise? DAVEY CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs...
From £1,984
HAM & PEARCE CONSTRUCTION LTD is a trusted extension builder serving customers in St Blaise and the surrounding area. Contact us to today to get a ...
From £2,040
Aston Construction Project Management is a trusted extension builder serving customers in St Blaise and the surrounding area. Contact us to today t...
From £2,288
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,304
We are a part of the award-winning Refresh Renovation franchise network.Whether you want a simple bathroom remodel, or a large double storey extens...
From £2,304
Need an Extension Builder in St Blaise? Paul Clarke Architectural Builders has been helping local clients (20 mile radius) with their extension bui...
From £2,264
Probuild was set up as a platform to service clients with High End affordable quality Construction & project Management with solid advice & accurat...
From £2,408
We are specialist in All aspects of Masonry & General Building Works. We also offer a Design and Build service to suit your requirements.At Burton ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in St Blaise it ranges from £1,984 (HAM & PEARCE CONSTRUCTION LTD based in PL23) to £2,408 (Burton Construction based in PL31).
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 Blaise by posting a job with HaMuch and we will send it to extension builders in St Blaise.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near St Austell | £38 | £245 |
| Install An RSJ near Truro | £31 | £206 |
| Install An RSJ near Newquay | £32 | £230 |
| Install An RSJ near Falmouth | £33 | £220 |
| Install An RSJ near Plymouth | £30 | £230 |
| Install An RSJ near Camborne | £28 | £196 |
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 - £17,504

Two storey extension - £88,006

Build a timber frame extension - £26,004

Build a swimming pool - £81,004

Single storey extension - £55,080

Side return extension - £41,545

Install an RSJ - £2,204

Outbuilding - £10,004

Build a Mansard loft conversion - £52,004

Loft conversion - £33,788

Build a kitchen extension - £42,004

Hip to gable loft conversion - £42,004

Granny annexe - £87,004

Garden office - £10,004

Convert a Garage - £16,004

Garage - £18,504

Build a flat roof extension - £22,004

Build a dormer loft conversion - £42,004

Concrete foundations - £6,254

Convert a bungalow loft - £29,004

Convert a basement - £37,545