From £2,560
We are a family run business with over 30 years of combined experience, we offer everything from replacing doors and worktops on your kitchen to sm...
From £2,432
We are a local roofing company offering a complete roofing service.We provide one of the most cost effective, reliable roofing services in and ...
From £2,472
Stevenage, SG1
Harris Building Solutions Limited is an established extension buildering business in Stevenage. We come highly recommended and provide competitive ...
From £2,216
Stevenage, SG1
Experienced extension builder ready to quote for your work. G B BUILDSTORE LTD is the best extension builder in Stevenage. No obligation free quote...
From £2,392
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £2,360
Stevenage, SG1
Experienced extension builder ready to quote for your work. Precision Roofing & Building Maintenance is the best extension builder in Stevenage. No...
From £2,368
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,296
Relax... you have found a reliable extension builder in Stevenage. GB Build is a friendly and reliable company based in Stevenage who consider no j...
From £2,704
WALKERN CONSTRUCTION LIMITED is an established and experienced local extension builder in Stevenage. Please contact us for a free, no obligation qu...
From £2,592
Our building services company Country Home Concepts has been helping customers in Hertfordshire and the surrounding area by providing professional,...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Stevenage it ranges from £2,216 (G B BUILDSTORE LTD based in SG1) to £2,704 (WALKERN CONSTRUCTION LIMITED based in SG2).
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 Stevenage by posting a job with HaMuch and we will send it to extension builders in Stevenage.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Stevenage | £44 | £282 |
| Install An RSJ near Hitchin | £43 | £283 |
| Install An RSJ near North Hertfordshire | £44 | £283 |
| Install An RSJ near Letchworth | £44 | £283 |
| Install An RSJ near East Hertfordshire | £44 | £289 |
| Install An RSJ near Welwyn Garden City | £42 | £268 |
| Install An RSJ near Hertford | £46 | £289 |
| Install An RSJ near Harpenden | £86 | £315 |
| Install An RSJ near Luton | £42 | £276 |
| Install An RSJ near Ware | £47 | £296 |
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 - £17,739

Two storey extension - £88,359

Build a timber frame extension - £26,239

Build a swimming pool - £81,239

Single storey extension - £59,784

Side return extension - £44,191

Install an RSJ - £2,439

Outbuilding - £10,239

Build a Mansard loft conversion - £52,239

Loft conversion - £35,993

Build a kitchen extension - £42,239

Hip to gable loft conversion - £42,239

Granny annexe - £87,239

Garden office - £10,239

Convert a Garage - £16,239

Garage - £18,739

Build a flat roof extension - £22,239

Build a dormer loft conversion - £42,239

Concrete foundations - £6,489

Convert a bungalow loft - £29,239

Convert a basement - £40,191