From £2,456
Need an Extension Builder in EC4V? 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 EC4V. 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 EC4V? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £2,296
Omniform are here to help customers who need an Extension Builder in EC4V. We offer a competitive rate to complete all your extension buildering jo...
From £2,488
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,544
Elite Building is an established extension buildering business in EC4V. 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 £2,400
Experienced extension builder ready to quote for your work. Space Design Construction Services Ltd is the best extension builder in EC4V. No obliga...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in EC4V it ranges from £2,192 (SDL PKB based in Ec4a) 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 EC4V by posting a job with HaMuch and we will send it to extension builders in EC4V.
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 - £17,743

Two storey extension - £88,365

Build a timber frame extension - £26,243

Build a swimming pool - £81,243

Single storey extension - £59,864

Side return extension - £44,236

Install an RSJ - £2,443

Outbuilding - £10,243

Build a Mansard loft conversion - £52,243

Loft conversion - £36,030

Build a kitchen extension - £42,243

Hip to gable loft conversion - £42,243

Granny annexe - £87,243

Garden office - £10,243

Convert a Garage - £16,243

Garage - £18,743

Build a flat roof extension - £22,243

Build a dormer loft conversion - £42,243

Concrete foundations - £6,493

Convert a bungalow loft - £29,243

Convert a basement - £40,236