From £2,600
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,360
Need an Extension Builder in DT9? Morris Concrete Designs has been helping local clients (20 mile radius) with their extension buildering jobs for ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in DT9 it ranges from £2,360 (Morris Concrete Designs based in DT9) to £2,600 (Ed Bartlett Building Contractor based in DT9).
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 DT9 by posting a job with HaMuch and we will send it to extension builders in DT9.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Yeovil | £34 | £294 |
| Install An RSJ near South Somerset | £62 | £270 |
| Install An RSJ near Dorchester | £30 | £230 |
| Install An RSJ near Weymouth | £33 | £260 |
| Install An RSJ near Frome | £33 | £263 |
| Install An RSJ near Bridgwater | £30 | £236 |
| Install An RSJ near Taunton | £31 | £242 |
| Install An RSJ near Bath | £32 | £249 |
| Install An RSJ near Poole | £38 | £250 |
| Install An RSJ near Trowbridge | £34 | £266 |
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 - £17,780

Two storey extension - £88,420

Build a timber frame extension - £26,280

Build a swimming pool - £81,280

Single storey extension - £60,600

Side return extension - £44,650

Install an RSJ - £2,480

Outbuilding - £10,280

Build a Mansard loft conversion - £52,280

Loft conversion - £36,375

Build a kitchen extension - £42,280

Hip to gable loft conversion - £42,280

Granny annexe - £87,280

Garden office - £10,280

Convert a Garage - £16,280

Garage - £18,780

Build a flat roof extension - £22,280

Build a dormer loft conversion - £42,280

Concrete foundations - £6,530

Convert a bungalow loft - £29,280

Convert a basement - £40,650