From £1,760
We are a locl fun family business with over 20 years experience. We specialise in all aspects of the building trade, no job too big or too sm...
From £2,096
Steven Clark Building Services is an established and experienced local extension builder in DT1. Please contact us for a free, no obligation quote ...
From £1,896
Trusted and professional extension builder in DT1. Experienced in all extension buildering work and keeping within budget and on quote. Stuart's Bu...
From £1,696
We are Dorset Build & Maintenance Company Ltd. We are a medium sized local building and maintenance contractor, and our work area is prima...
From £2,208
We are a small business priding oueselves on high quality works carried out with care and attention. We use a select few subcontractors to help com...
From £2,736
Chris Larner building services is a trusted extension builder serving customers in DT1 and the surrounding area. Contact us to today to get a compe...
From £2,736
Our building services company Roofix and Build Ltd have twenty years experience of helping customers in Weymouth and the surrounding area by provid...
From £2,216
Dorset Showhomes Ltd is an established extension buildering business in DT1. We come highly recommended and provide competitive quotes for your wor...
From £2,392
Need to find an Extension Builder near you for all your extension buildering work?
J FLANN BUILDING & MAINTENANCE provides a local, trusted...
From £2,248
DM Building & Property Maintenance is a trusted extension builder serving customers in DT1 and the surrounding area. Contact us to today to get a c...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in DT1 it ranges from £1,696 (Dorset Build & Maintenance Company Limited based in DT2) to £2,736 (Chris Larner building services based in Dt3).
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 DT1 by posting a job with HaMuch and we will send it to extension builders in DT1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Dorchester | £26 | £201 |
| Install An RSJ near Weymouth | £28 | £221 |
| Install An RSJ near Yeovil | £28 | £242 |
| Install An RSJ near Poole | £33 | £215 |
| Install An RSJ near South Somerset | £48 | £208 |
| Install An RSJ near Bournemouth | £33 | £221 |
| Install An RSJ near Taunton | £27 | £208 |
| Install An RSJ near Salisbury | £30 | £211 |
| Install An RSJ near Bridgwater | £27 | £212 |
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 - £17,498

Two storey extension - £87,998

Build a timber frame extension - £25,998

Build a swimming pool - £80,998

Single storey extension - £54,968

Side return extension - £41,482

Install an RSJ - £2,198

Outbuilding - £9,998

Build a Mansard loft conversion - £51,998

Loft conversion - £33,735

Build a kitchen extension - £41,998

Hip to gable loft conversion - £41,998

Granny annexe - £86,998

Garden office - £9,998

Convert a Garage - £15,998

Garage - £18,498

Build a flat roof extension - £21,998

Build a dormer loft conversion - £41,998

Concrete foundations - £6,248

Convert a bungalow loft - £28,998

Convert a basement - £37,482