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 £1,600

Last active Oct 26
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T.I Building

T.I Building is a trusted extension builder serving customers in Lisburn and the surrounding area. Contact us to today to get a competitive quote f...

From £1,336

Last active Jun 26
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Mount Oriel Conversions & Extensions

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

Mount Oriel Conversions & Extensions provides a local, t...

From £1,568

Last active May 26
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SM Plumbing & Heating

Relax... you have found a reliable extension builder in Lisburn. SM Plumbing & Heating is a friendly and reliable company based in Lisburn who cons...

From £1,536

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Belfast Loft Company

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

From £1,688

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AK Building Services

Adam King

Ak building 

From £1,584

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Finch Construction NI

Relax... you have found a reliable extension builder in Lisburn. Finch Construction NI is a friendly and reliable company based in Lisburn who cons...

From £1,376

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Extended living by Gilbert-Ash

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

RSJ cost in Lisburn

Estimates for install an rsj near Lisburn

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Lisburn it ranges from £1,336 (Mount Oriel Conversions & Extensions based in BT8) to £1,688 (AK Building Services based in BT8).

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

"RSJ installation" - BT17, job posted 01/01/70


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Estimates for common extension builder jobs in Lisburn;

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...