From £2,488
Realise Your Luxury Dream Home With The Design And Build Partner You Can Trust.At MG Design & Build we have over 25 years of experience in the cons...
From £2,320
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 £2,512
Experienced extension builder ready to quote for your work. Bricklayers is the best extension builder in SG15. No obligation free quotes and many h...
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 £2,408
Need an Extension Builder in SG15? WILLMOTT DIXON CONSTRUCTION LI has been helping local clients (20 mile radius) with their extension buildering j...
From £2,368
Need an Extension Builder in SG15? Gilbert & Gregson Construction Ltd has been helping local clients (20 mile radius) with their extension builderi...
From £2,688
Need an Extension Builder in SG15? M SPINDLER CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs...
From £2,328
Draincall Services Ltd is a trusted extension builder serving customers in SG15 and the surrounding area. Contact us to today to get a competitive ...
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 £2,584
Experienced extension builder ready to quote for your work. HB Construction is the best extension builder in SG15. No obligation free quotes and ma...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SG15 it ranges from £2,320 (North Hertfordshire Construction Ltd 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 | £41 | £278 |
| 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 - £17,786

Two storey extension - £88,430

Build a timber frame extension - £26,286

Build a swimming pool - £81,286

Single storey extension - £60,728

Side return extension - £44,722

Install an RSJ - £2,486

Outbuilding - £10,286

Build a Mansard loft conversion - £52,286

Loft conversion - £36,435

Build a kitchen extension - £42,286

Hip to gable loft conversion - £42,286

Granny annexe - £87,286

Garden office - £10,286

Convert a Garage - £16,286

Garage - £18,786

Build a flat roof extension - £22,286

Build a dormer loft conversion - £42,286

Concrete foundations - £6,536

Convert a bungalow loft - £29,286

Convert a basement - £40,722