Find a builder to make your building structurally sound

RSJs support your new extension or other construction to ensure that your property is structurally sound. They are crucial parts of your building work that mustn't be ignored, and must be installed by a professional.  To see prices and availability for your job click green button.

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From £1,880

Last active Nov 26
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K Barrett Roofing LTD

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...

From £2,184

Last active Nov 26
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Atwal Building Services Ltd

Need to find an Extension Builder near you for all your extension buildering work?

Atwal Building Services Ltd provides a local, trusted ex...

From £2,064

Last active Nov 26
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LC BUILDING SERVICES

Lloyd Clarke

Need to find an Extension Builder near you for all your extension buildering work?

LC BUILDING SERVICES provides a local, trusted extension...

From £2,184

Last active Nov 26
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Brickfast Builders

Brickfast Builders is an established extension buildering business in B1. We come highly recommended and provide competitive quotes for your work.<...

From £1,904

Last active Sep 26
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AJ Home Improvements

AJ Home Improvements is an established extension buildering business in B1. We come highly recommended and provide competitive quotes for your work...

From £1,768

Last active Sep 26
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Bhogal Construction

Trusted and professional extension builder in B1. Experienced in all extension buildering work and keeping within budget and on quote. Bhogal Const...

From £2,120

Last active Nov 25
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x10hosts

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

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HSS CONSTRUCTION LTD

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

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BellTrim Wood Products

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

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Chadha Constructions Limited

Our building services company Chadha Constructions Limited was established in March 2021, but have been providing professional, trustworthy buildin...

RSJ cost in B1

Estimates for install an rsj near B1

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


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Estimates for common extension builder jobs in B1;

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.

More extensions & conversions cost guides...