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. 

Install an RSJ cost in EC3A - Sort by rates or availability

From £2,376
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Self employed

(rates verified 05/10/26)

Hight quality of jobs

From £2,248
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J&J Building Solutions

(rates verified 18/09/26)

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in EC3A. No obligation free quotes...

From £2,296
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Matharu Buildings

(last active 06/10/26)

Matharu Buildings is an established extension buildering business in EC3A. We come highly recommended and provide competitive quotes for your work....

From £2,512
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T M Builder

(last active 06/10/26)

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

From £2,368
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Best Builders

(last active 06/10/26)

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

From £2,560
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M & A UK Ltd

(last active 06/10/26)

Relax... you have found a reliable extension builder in EC3A. M & A UK Ltd is a friendly and reliable company based in EC3A who consider no job as ...

From £2,392
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1 review

Torrington

(last active 06/10/26)

NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...

"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO

From £2,632
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MM-Builders

(last active 06/10/26)

Maintenance and repair 

Family run business from 2006

 

 

From £2,296
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KS Plastering SERVICE

(last active 06/10/26)

Thistle Bonding Coat: Ideal for use on low-suction backgrounds such as brick or concrete blocks, this product provided a solid foundation, Thi...

From £2,344
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Greens Gardening & Landscape Property Maintenance

(last active 06/10/26)

Watch our short video highlighting all our expertise and services here:

more than 10 y...

RSJ cost in EC3A

Estimates for install an rsj near EC3A

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in EC3A it ranges from £2,248 (J&J Building Solutions based in SW16) to £2,632 (MM-Builders based in N9).

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 EC3A by posting a job with HaMuch and we will send it to extension builders in EC3A.


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Estimates for common extension builder jobs in EC3A;

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...