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 £2,376

Rates verified Oct 26
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Self employed

Hamza Elezi

Hight quality of jobs

From £2,248

Rates verified Sep 26
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J&J Building Solutions

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in City Of Westminster. No obligat...

From £3,224

Last active Nov 26
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Buci builders ltd

Robert Buci

Buci builders ltd is a trusted extension builder serving customers in City Of Westminster and the surrounding area. Contact us to today to get a co...

From £2,384

Last active Nov 26
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L H Builders

Relax... you have found a reliable extension builder in City Of Westminster. L H Builders is a friendly and reliable company based in City Of Westm...

From £2,160

Last active Nov 26
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HARLEY BUILDING SERVICES LTD

HARLEY BUILDING SERVICES LTD are here to help customers who need an Extension Builder in City Of Westminster. We offer a competitive rate to comple...

From £2,232

Last active Nov 26
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D Bradshaw Building Renovation

D Bradshaw Building Renovation is a trusted extension builder serving customers in City Of Westminster and the surrounding area. Contact us to toda...

From £2,592

Last active Nov 26
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Samuele Paolini

Samuele Paolini

Need an Extension Builder in City Of Westminster? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering j...

From £2,560

Last active Nov 26
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A&J BUILDERS & DECORATORS LTD

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

From £2,104

Last active Nov 26
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V.S.P

V.S.P is a trusted extension builder serving customers in City Of Westminster and the surrounding area. Contact us to today to get a competitive qu...

From £2,296

Last active Nov 26
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Mr

Jonathan Rimmer

Experienced extension builder ready to quote for your work. Mr is the best extension builder in City Of Westminster. No obligation free quotes and ...

RSJ cost in City Of Westminster

Estimates for install an rsj near City Of Westminster

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in City Of Westminster it ranges from £2,104 (V.S.P based in NW10) to £3,224 (Buci builders ltd based in SE27).

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

"RSJ re-installation" - N16, job posted 04/10/25


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Install An RSJ near London£43£273
Install An RSJ near Camden Town£44£277
Install An RSJ near Belgravia£44£276
Install An RSJ near Chelsea£44£276
Install An RSJ near Lambeth£44£275
Install An RSJ near Kensington£44£277
Install An RSJ near Islington£45£276
Install An RSJ near Fulham£44£278
Install An RSJ near Camberwell£44£276
Install An RSJ near Bethnal Green£45£276

Estimates for common extension builder jobs in City Of Westminster;

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...