From £2,328
Experienced extension builder ready to quote for your work. Storeyboard is the best extension builder in Greenwich. No obligation free quotes and m...
From £2,400
Greenwich Greater London, SE10
Storeyboard work on projects of all sizes from outhouses and extensions to full renovations and commercial projects.We offer a complete and bespoke...
From £2,472
Experienced extension builder ready to quote for your work. Prestige Roofing Limited is the best extension builder in Greenwich. No obligation free...
From £2,120
Greenwich, SE10
Trusted and professional extension builder in Greenwich. Experienced in all extension buildering work and keeping within budget and on quote. Trafa...
From £2,248
Experienced extension builder ready to quote for your work. AZC BUILDING SERVICES is the best extension builder in Greenwich. No obligation free qu...
From £2,632
Island design & Construction Ltd are here to help customers who need an Extension Builder in Greenwich. We offer a competitive rate to complete all...
From £2,416
Our building services company Demiri Builder Ltd has 15 years’ experience in the industry. We have been helping customers in Lewisham and the sur...
From £2,240
Dule Vida Property Design Ltd is a trusted extension builder serving customers in Greenwich and the surrounding area. Contact us to today to get a ...
From £2,104
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,320
CG Design & Build is a boutique architectural design agency with in-house construction teams, delivering unique one-off residential and commercial...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Greenwich it ranges from £2,104 (CG Design and Build LTD. based in e14) to £2,632 (Island design & Construction Ltd based in E14).
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 Greenwich by posting a job with HaMuch and we will send it to extension builders in Greenwich.
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 - £17,628

Two storey extension - £88,192

Build a timber frame extension - £26,128

Build a swimming pool - £81,128

Single storey extension - £57,560

Side return extension - £42,940

Install an RSJ - £2,328

Outbuilding - £10,128

Build a Mansard loft conversion - £52,128

Loft conversion - £34,950

Build a kitchen extension - £42,128

Hip to gable loft conversion - £42,128

Granny annexe - £87,128

Garden office - £10,128

Convert a Garage - £16,128

Garage - £18,628

Build a flat roof extension - £22,128

Build a dormer loft conversion - £42,128

Concrete foundations - £6,378

Convert a bungalow loft - £29,128

Convert a basement - £38,940