From £2,456
Greater London, EC4M
Need an Extension Builder in EC4M? Flow Property Services has been helping local clients (5 mile radius) with their extension buildering jobs for m...
From £2,192
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,304
SCANDIIN is an established and experienced local extension builder in EC4M. Please contact us for a free, no obligation quote and competitive rates...
From £2,592
We have the experience and knowledge to carry out any project, big or small. Our team of experts thoroughly plan the budget and manage your projec...
From £2,472
Need an Extension Builder in EC4M? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £2,544
Elite Building is an established extension buildering business in EC4M. We come highly recommended and provide competitive quotes for your work.
From £2,688
Elite Building And Heating was founded by Davinder Dhanda in 2018. Based in Central London, Davinder Worked on Construction sites since the age of ...
From £2,120
Experienced extension builder ready to quote for your work. Kovacs Construction Ltd is the best extension builder in EC4M. No obligation free quote...
From £2,472
At Kovacs Construction, you can rely on our talented builders and engineers to deliver unrivalled building services solutions. Let us show you our ...
From £2,296
Omniform are here to help customers who need an Extension Builder in EC4M. We offer a competitive rate to complete all your extension buildering jo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in EC4M it ranges from £2,120 (Kovacs Construction Ltd based in EC1N) to £2,688 (Elite Building based in WC2A).
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 EC4M by posting a job with HaMuch and we will send it to extension builders in EC4M.
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 - £17,714

Two storey extension - £88,320

Build a timber frame extension - £26,214

Build a swimming pool - £81,214

Single storey extension - £59,272

Side return extension - £43,903

Install an RSJ - £2,414

Outbuilding - £10,214

Build a Mansard loft conversion - £52,214

Loft conversion - £35,753

Build a kitchen extension - £42,214

Hip to gable loft conversion - £42,214

Granny annexe - £87,214

Garden office - £10,214

Convert a Garage - £16,214

Garage - £18,714

Build a flat roof extension - £22,214

Build a dormer loft conversion - £42,214

Concrete foundations - £6,464

Convert a bungalow loft - £29,214

Convert a basement - £39,903