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 £2,120

Rates updated Oct 26
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Lp Townsend Brickwork

Lee Townsend

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

Lp Townsend Brickwork provides a local, trusted extensio...

From £2,288

Last active Nov 26
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B.A Ruffle Building Contractor

B.A Ruffle Building Contractor is an established extension buildering business in Windsor & Maidenhead. We come highly recommended and provide comp...

From £2,512

Last active Oct 26
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Luxuria Property Ltd

From 2007 – 2015 David Rudelhoff (Founder and Director) was the Property Manager for a high profile, high net worth family. During that time, in ...

From £2,336

Last active Oct 26
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A L King Services

Experienced extension builder ready to quote for your work. A L King Services is the best extension builder in Windsor & Maidenhead. No obligation ...

From £2,672

Last active Oct 26
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ASAP Roofing & Exterior Maintenance

ASAP Roofing & Exterior Maintenance is a trusted extension builder serving customers in Windsor & Maidenhead and the surrounding area. Contact us t...

From £2,424

Last active Oct 26
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A South View

Experienced extension builder ready to quote for your work. A South View is the best extension builder in Windsor & Maidenhead. No obligation free ...

From £2,560

Last active Oct 26
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Ani Mokashi

Ani Mokashi is an established and experienced local extension builder in Windsor & Maidenhead. Please contact us for a free, no obligation quote an...

From £2,184

Last active Oct 26
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NICE BUILD

Experienced extension builder ready to quote for your work. NICE BUILD is the best extension builder in Windsor & Maidenhead. No obligation free qu...

From £2,640

Last active Oct 26
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GDC Design & Build

Lead by designer Richard Gordon, GDC is a London and Berkshire based Design & Build firm with a vast amount of experience in both the residential a...

From £2,152

Last active Oct 26
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Dub Solutions

Dub Solutions is a trusted extension builder serving customers in Windsor & Maidenhead and the surrounding area. Contact us to today to get a compe...

RSJ cost in Windsor & Maidenhead

Estimates for install an rsj near Windsor & Maidenhead

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Windsor & Maidenhead it ranges from £2,120 (Lp Townsend Brickwork based in SL2) to £2,672 (ASAP Roofing & Exterior Maintenance based in SL5).

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

"RSJ installation" - SLOUGH, job posted 05/07/25


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Estimates for common extension builder jobs in Windsor & Maidenhead;

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...