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Render
Experienced extension builder ready to quote for your work. Render is the best extension builder in IG11. No obligation free quotes and many happy ...
Kunshi Services UK Ltd
Kunshi Services UK Ltd is a trusted extension builder serving customers in IG11 and the surrounding area. Contact us to today to get a competitive ...
From £2,080
Can design and Construction
Erald Kanani
Member since August 2025
Barking, IG11
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Derryard Construction Ltd
Relax... you have found a reliable extension builder in IG11. Derryard Construction Ltd is a friendly and reliable company based in IG11 who consid...
B J CULLEN BUILDERS
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in IG11. We offer a competitive rate to complete all your extension bu...
Major Building Contractors Ltd
Relax... you have found a reliable extension builder in IG11. Major Building Contractors Ltd is a friendly and reliable company based in IG11 who c...
Sz Builders
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
KLR Shopfitters
KLR Shopfitters
RM82R
KLR Shopfitters supplies and fits modern aluminium shopfronts designed for strength, clarity, and long-lasting performance. Our service covers the ...
Albion Ra Ltd
London, IG11
Albion RA offers complete construction solutions for residential clients across Kent\nand the surrounding areas.\n\nOur specialist team has many ye...
From £2,384
A TEAM CONSTRUCTION LTD
Trusted and professional extension builder in IG11. Experienced in all extension buildering work and keeping within budget and on quote. A TEAM CON...
RSJ cost in IG11
How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in IG11 it ranges from £2,080 (Can design and Construction based in Ig11) to £2,912 (Render based in IG1).
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 IG11 by posting a job with HaMuch and we will send it to extension builders in IG11.
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Estimates for common extension builder jobs in IG11;
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 - £17,663
Two storey extension - £88,245
Build a timber frame extension - £26,163
Build a swimming pool - £81,163
Single storey extension - £58,264
Side return extension - £43,336
Install an RSJ - £2,363
Outbuilding - £10,163
Build a Mansard loft conversion - £52,163
Loft conversion - £35,280
Build a kitchen extension - £42,163
Hip to gable loft conversion - £42,163
Granny annexe - £87,163
Garden office - £10,163
Convert a Garage - £16,163
Garage - £18,663
Build a flat roof extension - £22,163
Build a dormer loft conversion - £42,163
Concrete foundations - £6,413
Convert a bungalow loft - £29,163
Convert a basement - £39,336