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. 

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Install an RSJ cost in SE7

J&J Building Solutions

From £2,248

(rates verified 18/09/26)

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SE7. No obligation free quotes ...

T M Builder

From £2,512

(last active 26/09/26)

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

Rafix Building

From £2,760

(last active 26/09/26)

Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...

Mr

From £2,296

(last active 26/09/26)

Experienced extension builder ready to quote for your work. Mr is the best extension builder in SE7. No obligation free quotes and many happy custo...

JK Doors

From £2,184

(last active 26/09/26)

JK Doors is a trusted extension builder serving customers in SE7 and the surrounding area. Contact us to today to get a competitive quote for exten...

Torrington

From £2,392

(last active 26/09/26)

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

Samuele Paolini

From £2,592

(last active 26/09/26)

Need an Extension Builder in SE7? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...

Guven Buildings LTD

From £2,512

(last active 26/09/26)

skilled worker who specializes in completing a wide range of building and renovation projects

HOUSE BUILDING SERVICES LIMITED

From £2,816

(last active 25/09/26)

HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in SE7 and the surrounding area. Contact us to today to get a comp...

GR MAINTENANCE LTD

From £2,088

Member since April 2025

Trusted and professional extension builder in SE7. Experienced in all extension buildering work and keeping within budget and on quote. GR MAINTENA...

RSJ cost in SE7

Estimates for install an rsj near SE7

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SE7 it ranges from £2,088 (GR MAINTENANCE LTD based in IG11) to £2,816 (HOUSE BUILDING SERVICES LIMITED based in DA16).

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 SE7 by posting a job with HaMuch and we will send it to extension builders in SE7.


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Estimates for common extension builder jobs in SE7;

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...