From £1,904
AJ Home Improvements is an established extension buildering business in B8. We come highly recommended and provide competitive quotes for your work...
From £1,904
Trusted and professional extension builder in B8. Experienced in all extension buildering work and keeping within budget and on quote. Probuild360 ...
From £2,064
Need to find an Extension Builder near you for all your extension buildering work?
LC BUILDING SERVICES provides a local, trusted extension...
From £2,120
Experienced extension builder ready to quote for your work. x10hosts is the best extension builder in B8. No obligation free quotes and many happy ...
From £2,024
Reliable person 25 years experience
if you look on a website rated people and have a look at my ratings
From £2,184
Brickfast Builders is an established extension buildering business in B8. We come highly recommended and provide competitive quotes for your work.<...
From £1,896
Laurence Cox is an established and experienced local extension builder in B8. Please contact us for a free, no obligation quote and competitive rat...
From £2,184
Need to find an Extension Builder near you for all your extension buildering work?
Dayfos Properties Ltd provides a local, trusted extensio...
From £2,184
Fletcher's Building & Maintenance are a family owned business that understands, in order to achieve our continued success our customers and the...
From £1,840
Renka is an established and experienced local extension builder in B8. Please contact us for a free, no obligation quote and competitive rates. Cov...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in B8 it ranges from £1,840 (Renka based in B19) to £2,184 (Brickfast Builders based in B6).
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 B8 by posting a job with HaMuch and we will send it to extension builders in B8.
"Removal of 3 walls and 3 RSJ installations to extend a kitchen. Need for a structual engineering consultation and building control approval since at least one wall will be load bearing." - BIRMINGHAM, job posted 05/05/24
"RSJ installation" - BIRMINGHAM, job posted 01/03/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Birmingham | £29 | £227 |
| Install An RSJ near Sutton Coldfield | £29 | £228 |
| Install An RSJ near Smethwick | £29 | £226 |
| Install An RSJ near Solihull | £29 | £231 |
| Install An RSJ near Oldbury | £29 | £227 |
| Install An RSJ near West Bromwich | £29 | £227 |
| Install An RSJ near Sandwell | £29 | £229 |
| Install An RSJ near Halesowen | £29 | £227 |
| Install An RSJ near Rowley Regis | £29 | £226 |
| Install An RSJ near Knowle | £31 | £241 |
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 - £17,330

Two storey extension - £87,746

Build a timber frame extension - £25,830

Build a swimming pool - £80,830

Single storey extension - £51,608

Side return extension - £39,592

Install an RSJ - £2,030

Outbuilding - £9,830

Build a Mansard loft conversion - £51,830

Loft conversion - £32,160

Build a kitchen extension - £41,830

Hip to gable loft conversion - £41,830

Granny annexe - £86,830

Garden office - £9,830

Convert a Garage - £15,830

Garage - £18,330

Build a flat roof extension - £21,830

Build a dormer loft conversion - £41,830

Concrete foundations - £6,080

Convert a bungalow loft - £28,830

Convert a basement - £35,592