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Select your affordable St Mewan extension builder
Relax... you have found a reliable extension builder in St Mewan. BUILDMARK BUILDERS is a friendly and reliable company based in St Mewan who consi...
SANDSTONE BUILDERS T/A is a trusted extension builder serving customers in St Mewan and the surrounding area. Contact us to today to get a competit...
From £2,288
Need an Extension Builder in St Mewan? 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 Mewan and the surrounding area. Contact us to today to get a c...
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 £2,288
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 Mewan? Paul Clarke Architectural Builders has been helping local clients (20 mile radius) with their extension buil...
From £2,040
Aston Construction Project Management is a trusted extension builder serving customers in St Mewan and the surrounding area. Contact us to today to...
From £2,008
Need to find an Extension Builder near you for all your extension buildering work?
Pendragon Builders Ltd provides a local, trusted extensi...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in St Mewan it ranges from £1,984 (HAM & PEARCE CONSTRUCTION LTD based in PL23) to £2,304 (Refresh Renovations Cornwall based in PL25).
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 Mewan by posting a job with HaMuch and we will send it to extension builders in St Mewan.
| 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 Camborne | £28 | £196 |
| Install An RSJ near St Ives, Cornwall | £27 | £188 |
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 - £17,464

Two storey extension - £87,946

Build a timber frame extension - £25,964

Build a swimming pool - £80,964

Single storey extension - £54,280

Side return extension - £41,095

Install an RSJ - £2,164

Outbuilding - £9,964

Build a Mansard loft conversion - £51,964

Loft conversion - £33,413

Build a kitchen extension - £41,964

Hip to gable loft conversion - £41,964

Granny annexe - £86,964

Garden office - £9,964

Convert a Garage - £15,964

Garage - £18,464

Build a flat roof extension - £21,964

Build a dormer loft conversion - £41,964

Concrete foundations - £6,214

Convert a bungalow loft - £28,964

Convert a basement - £37,095