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 HP15 - 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 £2,296

(last active 26/07/26)
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Building High Wycombe

Relax... you have found a reliable extension builder in HP15. Building High Wycombe is a friendly and reliable company based in HP15 who consider n...

From £2,240

(last active 26/07/26)
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Mitchell & Co Building & Renovations Ltd

Mitchell & Co Building & Renovations Ltd is an established extension buildering business in HP15. We come highly recommended and provide competitiv...

From £2,592

(last active 18/07/26)
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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 18/07/26)
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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 £2,480

(last active 18/07/26)
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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 18/07/26)
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Shaks build

Trusted and professional extension builder in HP15. Experienced in all extension buildering work and keeping within budget and on quote. Shaks buil...

From £2,360

(last active 28/06/26)
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Loudwater Building Services

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

Loudwater Building Services provides a local, trusted ex...

From £2,520

(last active 10/06/26)
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Chris Warren Construction Ltd

Chris Warren Construction Ltd is an established extension buildering business in HP15. We come highly recommended and provide competitive quotes fo...

From £2,600

(last active 17/05/26)
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E E Construction

E E Construction is an established extension buildering business in HP15. We come highly recommended and provide competitive quotes for your work.<...

RSJ cost in HP15

Estimates for install an rsj near HP15

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in HP15 it ranges from £2,240 (Mitchell & Co Building & Renovations Ltd based in HP13) to £2,600 (E E Construction based in HP10).

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 HP15 by posting a job with HaMuch and we will send it to extension builders in HP15.

"RSJ installation" - GREAT MISSENDEN, job posted 09/06/24


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Install An RSJ near Hazlemere£40£272
Install An RSJ near High Wycombe£39£272
Install An RSJ near Wycombe£39£271
Install An RSJ near Chesham£42£277
Install An RSJ near Gerrards Cross£43£282
Install An RSJ near Maidenhead£41£273
Install An RSJ near Berkhamsted£41£263
Install An RSJ near Rickmansworth£42£278
Install An RSJ near Dacorum£42£269
Install An RSJ near Slough£42£272

Estimates for common extension builder jobs in HP15;

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...