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From £2,440
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in DT11 it ranges from £2,440 (DAVID WEBB BUILDING CONT LTD based in DT11) to £2,440 (DAVID WEBB BUILDING CONT LTD based in DT11).
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 DT11 by posting a job with HaMuch and we will send it to extension builders in DT11.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Poole | £38 | £250 |
| Install An RSJ near Dorchester | £30 | £230 |
| Install An RSJ near Bournemouth | £38 | £257 |
| Install An RSJ near Weymouth | £33 | £260 |
| Install An RSJ near Christchurch | £36 | £251 |
| Install An RSJ near Yeovil | £34 | £294 |
| Install An RSJ near Salisbury | £35 | £247 |
| Install An RSJ near New Forest | £32 | £245 |
| Install An RSJ near South Somerset | £62 | £270 |
| Install An RSJ near Frome | £33 | £263 |
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 - £17,740

Two storey extension - £88,360

Build a timber frame extension - £26,240

Build a swimming pool - £81,240

Single storey extension - £59,800

Side return extension - £44,200

Install an RSJ - £2,440

Outbuilding - £10,240

Build a Mansard loft conversion - £52,240

Loft conversion - £36,000

Build a kitchen extension - £42,240

Hip to gable loft conversion - £42,240

Granny annexe - £87,240

Garden office - £10,240

Convert a Garage - £16,240

Garage - £18,740

Build a flat roof extension - £22,240

Build a dormer loft conversion - £42,240

Concrete foundations - £6,490

Convert a bungalow loft - £29,240

Convert a basement - £40,200