From £2,312
Allenton, DE24
Need to find an Extension Builder near you for all your extension buildering work?
J Pearson Building provides a local, trusted extension b...
From £2,352
Experienced extension builder ready to quote for your work. Rowes Building Ltd is the best extension builder in Allenton. No obligation free quotes...
From £2,064
Nestled in the rolling hillside of the West Midlands, Derby is a city birthed by the Roman Empire, and grown in the industrial revolution. Initiall...
From £2,104
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,016
Relax... you have found a reliable extension builder in Allenton. Flying Tortise is a friendly and reliable company based in Allenton who consider ...
From £2,000
Need to find an Extension Builder near you for all your extension buildering work?
BRICKON CONSTRUCTION LIMITED provides a local, trusted e...
From £1,952
Fitted Solutions was established in 2006 by founder Sam Fisher; with a promise to deliver exceptional craftmanship combined with first class custom...
From £2,096
Derbyshire Bathrooms & Kitchens Ltd is an established and experienced local extension builder in Allenton. Please contact us for a free, no obligat...
From £1,944
The Blackbrook Group offers a one-stop shop for your construction project. We offer support from concept through to completion. We start with an in...
From £1,904
A J Construction is an established and experienced local extension builder in Allenton. Please contact us for a free, no obligation quote and compe...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Allenton it ranges from £1,904 (A J Construction based in DE22) to £2,352 (Rowes Building Ltd based in DE24).
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 Allenton by posting a job with HaMuch and we will send it to extension builders in Allenton.
"RSJ installation" - DERBY, job posted 07/11/25
"RSJ installation Remove wall between kitchen and utility. Fit 3.4m steel beam Obtain Building Control approval and aign off" - DE3, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Derby | £30 | £228 |
| Install An RSJ near Erewash | £31 | £233 |
| Install An RSJ near Long Eaton | £32 | £248 |
| Install An RSJ near Ilkeston | £31 | £235 |
| Install An RSJ near Amber Valley | £31 | £238 |
| Install An RSJ near Swadlincote | £31 | £248 |
| Install An RSJ near Belper | £32 | £244 |
| Install An RSJ near Burton upon Trent | £32 | £255 |
| Install An RSJ near Heanor | £31 | £236 |
| Install An RSJ near Broxtowe | £33 | £240 |
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 - £17,374

Two storey extension - £87,812

Build a timber frame extension - £25,874

Build a swimming pool - £80,874

Single storey extension - £52,488

Side return extension - £40,087

Install an RSJ - £2,074

Outbuilding - £9,874

Build a Mansard loft conversion - £51,874

Loft conversion - £32,573

Build a kitchen extension - £41,874

Hip to gable loft conversion - £41,874

Granny annexe - £86,874

Garden office - £9,874

Convert a Garage - £15,874

Garage - £18,374

Build a flat roof extension - £21,874

Build a dormer loft conversion - £41,874

Concrete foundations - £6,124

Convert a bungalow loft - £28,874

Convert a basement - £36,087