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Select your affordable B1 extension builder
Experienced extension builder ready to quote for your work. K Barrett Roofing LTD is the best extension builder in B1. No obligation free quotes an...
Need to find an Extension Builder near you for all your extension buildering work?
Atwal Building Services Ltd provides a local, trusted ex...
Lloyd Clarke
Need to find an Extension Builder near you for all your extension buildering work?
LC BUILDING SERVICES provides a local, trusted extension...
Brickfast Builders is an established extension buildering business in B1. We come highly recommended and provide competitive quotes for your work.<...
AJ Home Improvements is an established extension buildering business in B1. We come highly recommended and provide competitive quotes for your work...
Trusted and professional extension builder in B1. Experienced in all extension buildering work and keeping within budget and on quote. Bhogal Const...
Experienced extension builder ready to quote for your work. x10hosts is the best extension builder in B1. No obligation free quotes and many happy ...
From £2,056
HSS CONSTRUCTION LTD are here to help customers who need an Extension Builder in B1. We offer a competitive rate to complete all your extension bui...
From £1,896
Need an Extension Builder in B1? BellTrim Wood Products has been helping local clients (20 mile radius) with their extension buildering jobs for ma...
From £2,016
Our building services company Chadha Constructions Limited was established in March 2021, but have been providing professional, trustworthy buildin...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in B1 it ranges from £1,768 (Bhogal Construction based in B67) to £2,184 (Atwal Building Services Ltd based in B20).
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 B1 by posting a job with HaMuch and we will send it to extension builders in B1.
"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 | £28 | £228 |
| Install An RSJ near Smethwick | £29 | £230 |
| Install An RSJ near Oldbury | £29 | £229 |
| Install An RSJ near West Bromwich | £29 | £228 |
| Install An RSJ near Halesowen | £28 | £225 |
| Install An RSJ near Rowley Regis | £29 | £228 |
| Install An RSJ near Sandwell | £29 | £231 |
| Install An RSJ near Sutton Coldfield | £28 | £227 |
| Install An RSJ near Solihull | £29 | £231 |
| Install An RSJ near Tipton | £29 | £228 |
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 - £17,307

Two storey extension - £87,711

Build a timber frame extension - £25,807

Build a swimming pool - £80,807

Single storey extension - £51,144

Side return extension - £39,331

Install an RSJ - £2,007

Outbuilding - £9,807

Build a Mansard loft conversion - £51,807

Loft conversion - £31,943

Build a kitchen extension - £41,807

Hip to gable loft conversion - £41,807

Granny annexe - £86,807

Garden office - £9,807

Convert a Garage - £15,807

Garage - £18,307

Build a flat roof extension - £21,807

Build a dormer loft conversion - £41,807

Concrete foundations - £6,057

Convert a bungalow loft - £28,807

Convert a basement - £35,331