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. 


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Install an RSJ cost in S1

CS Construction & Conversions

From £2,168

(last active 29/09/26)

Relax... you have found a reliable extension builder in S1. CS Construction & Conversions is a friendly and reliable company based in S1 who consid...

A Field Construction LTD

From £2,208

(last active 28/09/26)

We are a family run business with 20 years experience.

We take great care and attention to the work we carry out and pride ourselves on ...

Merebrook Construction Ltd

From £2,136

(last active 08/09/26)

Trusted and professional extension builder in S1. Experienced in all extension buildering work and keeping within budget and on quote. Merebrook Co...

Dore Decor

From £2,136

(last active 08/09/26)

Dore Decor are a family run business with over 30 years experience - we offer an extensive range of building services and are able to provide a ful...

JON WINDLE CONSTRUCTION

From £1,488

(last active 08/09/26)

46 years in the trade

Premier Lofts

From £2,312

(last active 08/09/26)

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

AMB Joinery & Building Services

From £2,544

(last active 08/09/26)

Trusted and professional extension builder in S1. Experienced in all extension buildering work and keeping within budget and on quote. AMB Joinery ...

Hallamshire Paving

From £2,288

(last active 08/09/26)

Hallamshire Paving is an established and experienced local extension builder in S1. Please contact us for a free, no obligation quote and competiti...

BP Builders

From £2,184

(last active 08/09/26)

BP Builders are here to help customers who need an Extension Builder in S1. We offer a competitive rate to complete all your extension buildering j...

MGG CONSTRUCTION LTD

From £2,064

(last active 08/09/26)

Trusted and professional extension builder in S1. Experienced in all extension buildering work and keeping within budget and on quote. MGG CONSTRUC...

RSJ cost in S1

Estimates for install an rsj near S1

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in S1 it ranges from £1,488 (JON WINDLE CONSTRUCTION based in S17) to £2,544 (AMB Joinery & Building Services based in S8).

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 S1 by posting a job with HaMuch and we will send it to extension builders in S1.

"RSJ installation" - SHEFFIELD, job posted 01/01/70


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Estimates for common extension builder jobs in S1;

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...