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 £1,944

Last active Oct 26
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CENTER

Vladimir Pavliiciuc

Location

SWANSEA, SA5

Local builder services CENTER "I, YOU, WE" CIC. Exterior building work build or repair a path or driveway construct or restore an ...

From £1,936

Last active Sep 26
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The Rod Squad

The Rod Squad is a trusted extension builder serving customers in Swansea and the surrounding area. Contact us to today to get a competitive quote ...

From £1,976

Last active Sep 26
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KAW Developments

KAW Developments is a trusted extension builder serving customers in Swansea and the surrounding area. Contact us to today to get a competitive quo...

From £2,200

Last active Sep 26
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Improve Not Move

Experienced extension builder ready to quote for your work. Improve Not Move is the best extension builder in Swansea. No obligation free quotes an...

From £1,776

Last active Sep 26
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Homekare Building Services Ltd

Homekare Building Services Ltd is an established and experienced local extension builder in Swansea. Please contact us for a free, no obligation qu...

From £2,216

Last active Sep 26
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Signature Project Solutions Ltd

Relax... you have found a reliable extension builder in Swansea. Signature Project Solutions Ltd is a friendly and reliable company based in Swanse...

From £1,912

Last active Sep 26
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Masterbuild

Trusted and professional extension builder in Swansea. Experienced in all extension buildering work and keeping within budget and on quote. Masterb...

From £2,032

Last active Sep 26
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K.D.L Property Maintenance

Need an Extension Builder in Swansea? K.D.L Property Maintenance has been helping local clients (20 mile radius) with their extension buildering jo...

From £2,200

Last active Sep 26
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R.H Damp Proofing

R.H Damp Proofing are here to help customers who need an Extension Builder in Swansea. We offer a competitive rate to complete all your extension b...

From £1,856

Last active Aug 26
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Amson Construction Limited

Need an Extension Builder in Swansea? Amson Construction Limited has been helping local clients (20 mile radius) with their extension buildering jo...

RSJ cost in Swansea

Estimates for install an rsj near Swansea

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Swansea it ranges from £1,776 (Homekare Building Services Ltd based in SA5) to £2,216 (Signature Project Solutions Ltd based in SA1).

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

"Install an RSJ" - SA5, job posted 09/11/26


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Install An RSJ near Swansea£29£229
Install An RSJ near Gorseinon£29£228
Install An RSJ near Neath£30£225
Install An RSJ near Port Talbot£31£227
Install An RSJ near Llanelli£29£231
Install An RSJ near Neath Port Talbot£31£224
Install An RSJ near Pyle£34£262
Install An RSJ near Maesteg£38£283
Install An RSJ near Porthcawl£33£252
Install An RSJ near Bridgend£32£200

Estimates for common extension builder jobs in Swansea;

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...