Need to find an Extension Builder near you for all your extension buildering work?
Avonvale Garage Doors provides a local, trusted extensio...
Relax... you have found a reliable extension builder in B91. F.I.I Building Services Ltd is a friendly and reliable company based in B91 who consid...
Ben Birch
I have been in the building industry for 28 years and have carried out extensions,loft conversions, knock throughs, plastering, carpentry,roofing a...
We are a forward thinking, award winning design and build company based in Solihull in the West Midlands. We strive to deliver the best experience ...
From £1,632
Peter Smith
Reliable and trustworthy
Also on checkatrafe
From £1,224
JAMES Crawford
we have over 13 years exp
we go that extra mile to make sure customers are 100 % happy
we cover a 20 miles radus for b26 area...
From £1,984
Form Construction Midlands Limited is a trusted extension builder serving customers in B91 and the surrounding area. Contact us to today to get a c...
From £2,128
JEWEL BUILDERS LTD are here to help customers who need an Extension Builder in B91. We offer a competitive rate to complete all your extension buil...
From £2,168
Need to find an Extension Builder near you for all your extension buildering work?
Timber Innovations provides a local, trusted extension b...
From £2,184
Cleaveland Fletcher
Fletcher's Building & Maintenance are a family owned business that understands, in order to achieve our continued success our customers and the...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in B91 it ranges from £1,224 (J s building & maintenance services limited based in B26) to £2,264 (MYBUILD based in B93).
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 B91 by posting a job with HaMuch and we will send it to extension builders in B91.
"RSJ installation" - B90, job posted 03/08/26
"Total cost of structural engineer report, supply and install 6M RSJ for a load bearing wall to make kitchen/diner." - B90, job posted 01/11/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Solihull | £29 | £231 |
| Install An RSJ near Knowle | £31 | £241 |
| Install An RSJ near Birmingham | £28 | £226 |
| Install An RSJ near Smethwick | £28 | £225 |
| Install An RSJ near Sutton Coldfield | £29 | £228 |
| Install An RSJ near Oldbury | £29 | £226 |
| Install An RSJ near Halesowen | £28 | £225 |
| Install An RSJ near Kenilworth | £29 | £223 |
| Install An RSJ near Coventry | £28 | £221 |
| Install An RSJ near West Bromwich | £28 | £225 |
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 - £17,282

Two storey extension - £87,674

Build a timber frame extension - £25,782

Build a swimming pool - £80,782

Single storey extension - £50,648

Side return extension - £39,052

Install an RSJ - £1,982

Outbuilding - £9,782

Build a Mansard loft conversion - £51,782

Loft conversion - £31,710

Build a kitchen extension - £41,782

Hip to gable loft conversion - £41,782

Granny annexe - £86,782

Garden office - £9,782

Convert a Garage - £15,782

Garage - £18,282

Build a flat roof extension - £21,782

Build a dormer loft conversion - £41,782

Concrete foundations - £6,032

Convert a bungalow loft - £28,782

Convert a basement - £35,052