Need an Extension Builder in SG17? R&J Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...
TCL BUILDING SOLUTIONS LTD are here to help customers who need an Extension Builder in SG17. We offer a competitive rate to complete all your exten...
From £2,560
Experienced extension builder ready to quote for your work. Specialist Building Refurbishm is the best extension builder in SG17. No obligation fre...
From £2,472
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,528
Our building services company David Douglas Developments has over 30 years’ experience, and built an established reputation of providing customer...
From £2,752
Blue Conker are dedicated to creating spaces for you to enjoy living. From the planning stages through to the finishing touches, our team of profes...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SG17 it ranges from £2,048 (R&J Building Services Ltd based in SG17) to £2,752 (Blue Conker Ltd based in MK45).
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 SG17 by posting a job with HaMuch and we will send it to extension builders in SG17.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Biggleswade | £41 | £268 |
| Install An RSJ near Letchworth | £44 | £283 |
| Install An RSJ near Mid Bedfordshire | £42 | £276 |
| Install An RSJ near Ampthill | £38 | £258 |
| Install An RSJ near North Hertfordshire | £44 | £283 |
| Install An RSJ near Hitchin | £43 | £283 |
| Install An RSJ near Kempston | £44 | £273 |
| Install An RSJ near Bedford | £45 | £278 |
| Install An RSJ near South Bedfordshire | £45 | £278 |
| Install An RSJ near Stevenage | £44 | £282 |
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 - £17,759

Two storey extension - £88,388

Build a timber frame extension - £26,259

Build a swimming pool - £81,259

Single storey extension - £60,173

Side return extension - £44,410

Install an RSJ - £2,459

Outbuilding - £10,259

Build a Mansard loft conversion - £52,259

Loft conversion - £36,175

Build a kitchen extension - £42,259

Hip to gable loft conversion - £42,259

Granny annexe - £87,259

Garden office - £10,259

Convert a Garage - £16,259

Garage - £18,759

Build a flat roof extension - £22,259

Build a dormer loft conversion - £42,259

Concrete foundations - £6,509

Convert a bungalow loft - £29,259

Convert a basement - £40,410