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 £2,176

Last active Nov 26
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Nathan Thomas Plumbing

Nathan Thomas

Nathan Thomas Plumbing is an established extension buildering business in L18. We come highly recommended and provide competitive quotes for your w...

From £1,872

Last active Nov 26
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J.M.C Building Services

J.M.C Building Services is a trusted extension builder serving customers in L18 and the surrounding area. Contact us to today to get a competitive ...

From £1,904

Last active Nov 26
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Render & External Insulation Specialist

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

From £1,992

Last active Sep 26
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J J Nuttall Specialist Roofing Ltd

J J Nuttall Specialist Roofing Ltd are here to help customers who need an Extension Builder in L18. We offer a competitive rate to complete all you...

From £1,936

Last active Jul 26
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R Sargeant

Relax... you have found a reliable extension builder in L18. R Sargeant is a friendly and reliable company based in L18 who consider no job as too ...

From £2,000

Last active Jun 26
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Oxygen Property Partners

Experienced extension builder ready to quote for your work. Oxygen Property Partners is the best extension builder in L18. No obligation free quot...

From £2,072

Last active May 26
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Elevate Finishing

Experienced extension builder ready to quote for your work. Elevate Finishing is the best extension builder in L18. No obligation free quotes and m...

From £2,216

Last active May 26
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Art Henry's

Art Henry's are here to help customers who need an Extension Builder in L18. We offer a competitive rate to complete all your extension buildering ...

From £1,888

Last active Apr 26
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Hyst

Relax... you have found a reliable extension builder in L18. Hyst is a friendly and reliable company based in L18 who consider no job as too big or...

From £2,000

Last active Apr 26
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McBuild

McBuild is a trusted extension builder serving customers in L18 and the surrounding area. Contact us to today to get a competitive quote for extens...

RSJ cost in L18

Estimates for install an rsj near L18

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in L18 it ranges from £1,872 (J.M.C Building Services based in L4) to £2,216 (Art Henry's based in L8).

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 L18 by posting a job with HaMuch and we will send it to extension builders in L18.

"Install an RSJ" - L36, job posted 27/09/26

"RSJ installation" - LIVERPOOL, job posted 09/04/25


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Install An RSJ near Liverpool£31£222
Install An RSJ near Huyton with Roby£31£225
Install An RSJ near Knowsley£31£222
Install An RSJ near Bebington£31£222
Install An RSJ near Birkenhead£31£219
Install An RSJ near Prescot£31£223
Install An RSJ near Wallasey£32£224
Install An RSJ near Bootle£33£228
Install An RSJ near Kirkby£31£224
Install An RSJ near Widnes£31£220

Estimates for common extension builder jobs in L18;

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...