Need an Extension Builder in SG15? WILLMOTT DIXON CONSTRUCTION LI has been helping local clients (20 mile radius) with their extension buildering j...
Experienced extension builder ready to quote for your work. HB Construction is the best extension builder in SG15. No obligation free quotes and ma...
Need an Extension Builder in SG15? R&J Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...
Need an Extension Builder in SG15? M SPINDLER CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs...
TCL BUILDING SOLUTIONS LTD are here to help customers who need an Extension Builder in SG15. We offer a competitive rate to complete all your exten...
From £2,320
James Hogbourne
For more than 10 years, North Hertfordshire Construction LTD have been the name you can trust when it comes to building and development! We are kno...
From £2,608
M P BUILDING LIMITED is an established and experienced local extension builder in SG15. Please contact us for a free, no obligation quote and compe...
From £1,904
Need an Extension Builder in SG15? L P L Property Services Limited has been helping local clients (20 mile radius) with their extension buildering ...
From £2,560
Experienced extension builder ready to quote for your work. Specialist Building Refurbishm is the best extension builder in SG15. No obligation fre...
From £2,512
Experienced extension builder ready to quote for your work. Bricklayers is the best extension builder in SG15. No obligation free quotes and many h...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SG15 it ranges from £1,904 (L P L Property Services Limited based in SG5) to £2,688 (M SPINDLER CONSTRUCTION LTD based in SG6).
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 SG15 by posting a job with HaMuch and we will send it to extension builders in SG15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Letchworth | £44 | £283 |
| Install An RSJ near North Hertfordshire | £44 | £283 |
| Install An RSJ near Biggleswade | £41 | £268 |
| Install An RSJ near Hitchin | £43 | £283 |
| Install An RSJ near Stevenage | £44 | £282 |
| Install An RSJ near Mid Bedfordshire | £42 | £276 |
| Install An RSJ near Ampthill | £38 | £258 |
| Install An RSJ near Luton | £42 | £279 |
| Install An RSJ near Kempston | £44 | £273 |
| Install An RSJ near South Bedfordshire | £45 | £278 |
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 - £17,702

Two storey extension - £88,304

Build a timber frame extension - £26,202

Build a swimming pool - £81,202

Single storey extension - £59,048

Side return extension - £43,777

Install an RSJ - £2,402

Outbuilding - £10,202

Build a Mansard loft conversion - £52,202

Loft conversion - £35,648

Build a kitchen extension - £42,202

Hip to gable loft conversion - £42,202

Granny annexe - £87,202

Garden office - £10,202

Convert a Garage - £16,202

Garage - £18,702

Build a flat roof extension - £22,202

Build a dormer loft conversion - £42,202

Concrete foundations - £6,452

Convert a bungalow loft - £29,202

Convert a basement - £39,777