From £2,248
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in E12. No obligation free quotes ...
From £2,384
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in E12. No obligation free quotes and m...
From £2,512
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,760
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...
From £2,296
Experienced extension builder ready to quote for your work. Mr is the best extension builder in E12. No obligation free quotes and many happy custo...
From £2,184
JK Doors is a trusted extension builder serving customers in E12 and the surrounding area. Contact us to today to get a competitive quote for exten...
From £2,392
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £2,592
Need an Extension Builder in E12? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £2,512
skilled worker who specializes in completing a wide range of building and renovation projects
From £2,816
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in E12 and the surrounding area. Contact us to today to get a comp...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in E12 it ranges from £2,184 (JK Doors based in W1W) 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 E12 by posting a job with HaMuch and we will send it to extension builders in E12.
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.

Underpin a building - £17,770

Two storey extension - £88,404

Build a timber frame extension - £26,270

Build a swimming pool - £81,270

Single storey extension - £60,392

Side return extension - £44,533

Install an RSJ - £2,470

Outbuilding - £10,270

Build a Mansard loft conversion - £52,270

Loft conversion - £36,278

Build a kitchen extension - £42,270

Hip to gable loft conversion - £42,270

Granny annexe - £87,270

Garden office - £10,270

Convert a Garage - £16,270

Garage - £18,770

Build a flat roof extension - £22,270

Build a dormer loft conversion - £42,270

Concrete foundations - £6,520

Convert a bungalow loft - £29,270

Convert a basement - £40,533