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 PO11 - Sort by rates or availability

From £2,280

(last active 22/08/26)
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Devscapes

Devscapes is an established extension buildering business in PO11. We come highly recommended and provide competitive quotes for your work.

From £2,176

(last active 16/07/26)
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Portsmouth Building Repairs

Experienced extension builder ready to quote for your work. Portsmouth Building Repairs is the best extension builder in PO11. No obligation free q...

From £1,912

(last active 27/04/26)
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R And S Building

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

R And S Building provides a local, trusted extension bui...

From £2,384

(last active 27/04/26)
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ROWLANDS CONSTRUCTION

Relax... you have found a reliable extension builder in PO11. ROWLANDS CONSTRUCTION is a friendly and reliable company based in PO11 who consider n...

From £2,200

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Pompey Homes Ltd

Experienced extension builder ready to quote for your work. Pompey Homes Ltd is the best extension builder in PO11. No obligation free quotes and m...

From £2,120

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Aspen Garden Rooms

Need an Extension Builder in PO11? Aspen Garden Rooms has been helping local clients (20 mile radius) with their extension buildering jobs for many...

RSJ cost in PO11

Estimates for install an rsj near PO11

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in PO11 it ranges from £1,912 (R And S Building based in PO11) to £2,384 (ROWLANDS CONSTRUCTION based in PO11).

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 PO11 by posting a job with HaMuch and we will send it to extension builders in PO11.

"RSJ installation" - PO2, job posted 01/01/70


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Estimates for common extension builder jobs in PO11;

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...