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 £3,000

Rates updated Oct 26
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GDW Construction

Relax... you have found a reliable extension builder in Surrey. GDW Construction is a friendly and reliable company based in Surrey who consider no...

From £2,392

Last active Nov 26
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Gb construction

Gani Bush

Gb construction are here to help customers who need an Extension Builder in Surrey. We offer a competitive rate to complete all your extension bui...

From £3,400

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Banga Decoration

Sebastian Banga

Member since August 2025

Banga decoration. Is Base in south London  for number of year  Banga decoration is a small  company. Wich provide an excellent job to the custom...

From £2,280

Last active Oct 26
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D & R Roofing & Loft Conversions, Building & Design

Relax... you have found a reliable extension builder in Surrey. D & R Roofing & Loft Conversions, Building & Design is a friendly and reliable comp...

From £2,488

Last active Oct 26
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Hilton building contractors ltd

Hilton building contractors ltd is a trusted extension builder serving customers in Surrey and the surrounding area. Contact us to today to get a c...

From £2,384

Last active Oct 26
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Amazing Space Design and Build Ltd.

Relax... you have found a reliable extension builder in Surrey. Amazing Space Design and Build Ltd. is a friendly and reliable company based in Sur...

From £2,136

Last active Oct 26
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Masters Property Services

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

From £2,528

Last active Sep 26
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J Stevens Roofing & Guttering

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

From £2,288

Last active Sep 26
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L M G Building Services (London) Ltd

Relax... you have found a reliable extension builder in Surrey. L M G Building Services (London) Ltd is a friendly and reliable company based in Su...

From £2,496

Last active Sep 26
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Aviemore Building Contractors Ltd

Experienced extension builder ready to quote for your work. Aviemore Building Contractors Ltd is the best extension builder in Surrey. No obligatio...

RSJ cost in Surrey

Estimates for install an rsj near Surrey

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Surrey it ranges from £2,136 (Masters Property Services based in SM5) to £3,400 (Banga Decoration based in CR7).

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

"RSJ installation also I will need help with the cost of theses below IRS extension either the following measurements. L-3m w-3.5m H-Item Site Preparation Groundworks & Foundations Floor Construction Superstructure Roof Construction Windows and External Doors Internal Works Electrical ..." - CR3, job posted 11/08/25


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Install An RSJ near Caterham£43£271
Install An RSJ near Redhill£41£269
Install An RSJ near Reigate & Banstead£41£271
Install An RSJ near Croydon£42£267
Install An RSJ near Reigate£40£270
Install An RSJ near Tadworth£41£271
Install An RSJ near Sutton£43£274
Install An RSJ near Epsom£44£275
Install An RSJ near Ewell£44£275
Install An RSJ near Horley£38£258

Estimates for common extension builder jobs in Surrey;

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...