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 ST10 - Sort by rates or availability

Asl Contracts

From £2,152

(last active 19/09/26)

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

HMS Property

From £1,848

(last active 04/09/26)

We are a family run firm, established for 25,years

are work is first class

and we are here for any after care

only...

Amberwood Design

From £1,752

(last active 01/09/26)

Trusted and professional extension builder in ST10. Experienced in all extension buildering work and keeping within budget and on quote. Amberwood ...

B B ROOFCARE LTD

From £1,952

(last active 21/08/26)

B B ROOFCARE LTD is a trusted extension builder serving customers in ST10 and the surrounding area. Contact us to today to get a competitive quote ...

D & K BUILDING SERVICES T/A

From £2,296

(last active 21/08/26)

D & K BUILDING SERVICES T/A is an established and experienced local extension builder in ST10. Please contact us for a free, no obligation quote an...

SJF Building Contractors

From £1,936

(last active 21/08/26)

Experienced extension builder ready to quote for your work. SJF Building Contractors is the best extension builder in ST10. No obligation free quot...

A & R Ansell Builders

From £1,872

(last active 04/08/26)

A & R Ansell Builders is a trusted extension builder serving customers in ST10 and the surrounding area. Contact us to today to get a competitive q...

A SHAFI CONSTRUCTION

From £1,880

(last active 04/08/26)

A SHAFI CONSTRUCTION is an established and experienced local extension builder in ST10. Please contact us for a free, no obligation quote and compe...

ANDREWS CONSTRUCTION

From £2,184

(last active 16/07/26)

Experienced extension builder ready to quote for your work. ANDREWS CONSTRUCTION is the best extension builder in ST10. No obligation free quotes a...

DR Plaster

From £1,848

(last active 09/07/26)

Qualified in 'Construction in the built Environment' sub diploma. I've run.my own business ( DR Plaster) for 14 years. Always busy but always frien...

RSJ cost in ST10

Estimates for install an rsj near ST10

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in ST10 it ranges from £1,752 (Amberwood Design based in SK11) to £2,296 (D & K BUILDING SERVICES T/A based in ST6).

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 ST10 by posting a job with HaMuch and we will send it to extension builders in ST10.


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Estimates for common extension builder jobs in ST10;

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...