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 Get quotes.

HaMuch is Excellent

Install an RSJ cost in Wycombe - Sort by rates or availability

From £2,384

Member since October 2026

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Buildmac Ltd

Chris Czerwinski

About us: Buildmac Ltd is a well-established, trustworthy, reliable and professional business based in High Wycombe, covering all surrounding areas...

From £2,480

Member since August 2026

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ABC Associates STRUCTURES 4 U

Relax... you have found a reliable extension builder in Wycombe. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in Wycombe ...

From £2,296

Last active Jul 26
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Building High Wycombe

Relax... you have found a reliable extension builder in Wycombe. Building High Wycombe is a friendly and reliable company based in Wycombe who cons...

From £2,240

Last active Jul 26
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Mitchell & Co Building & Renovations Ltd

Mitchell & Co Building & Renovations Ltd is an established extension buildering business in Wycombe. We come highly recommended and provide competi...

From £2,592

Last active Jul 26
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jesson ladscaping and construction

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

From £2,568

Last active Jul 26
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Steve Knight Construction

Steve Knight Construction is a High Wycombe based Building Company with 38 years experience in all aspects of the Construction Industry. We are abl...

From £2,232

Last active Jul 26
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GREENWORKS CONSTRUCTION

GREENWORKS CONSTRUCTION is an established and experienced local extension builder in Wycombe. Please contact us for a free, no obligation quote and...

From £2,408

Last active Jul 26
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JAYEM BUILDING SERVICES LTD

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

JAYEM BUILDING SERVICES LTD provides a local, trusted ex...

From £2,480

Last active Jul 26
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Charts Project Management and Build

Our building services company Charts Project Management and Build has been helping customers in Buckinghamshire and the surrounding area by providi...

From £2,520

Last active Jul 26
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Shaks build

Trusted and professional extension builder in Wycombe. Experienced in all extension buildering work and keeping within budget and on quote. Shaks b...

RSJ cost in Wycombe

Estimates for install an rsj near Wycombe

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Wycombe it ranges from £2,232 (GREENWORKS CONSTRUCTION based in SL7) to £2,592 (Jesson ladscaping and construction based in hp15).

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


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Estimates for common extension builder jobs in Wycombe;

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...