From £2,296
Omniform are here to help customers who need an Extension Builder in Cannon Street. We offer a competitive rate to complete all your extension buil...
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 £2,672
Need an Extension Builder in Cannon Street? GenUp Digital has been helping local clients (5 mile radius) with their extension buildering jobs for m...
From £2,608
London Roof Gardens is a trusted extension builder serving customers in Cannon Street and the surrounding area. Contact us to today to get a compet...
From £2,456
Need an Extension Builder in Cannon Street? Flow Property Services has been helping local clients (5 mile radius) with their extension buildering j...
From £2,472
Need an Extension Builder in Cannon Street? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs for...
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 £2,592
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 £2,400
Experienced extension builder ready to quote for your work. Space Design Construction Services Ltd is the best extension builder in Cannon Street. ...
From £2,304
SCANDIIN is an established and experienced local extension builder in Cannon Street. Please contact us for a free, no obligation quote and competit...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Cannon Street it ranges from £2,192 (SDL PKB based in Ec4a) to £2,672 (GenUp Digital based in EC3M).
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 Cannon Street by posting a job with HaMuch and we will send it to extension builders in Cannon Street.
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 - £17,748

Two storey extension - £88,372

Build a timber frame extension - £26,248

Build a swimming pool - £81,248

Single storey extension - £59,960

Side return extension - £44,290

Install an RSJ - £2,448

Outbuilding - £10,248

Build a Mansard loft conversion - £52,248

Loft conversion - £36,075

Build a kitchen extension - £42,248

Hip to gable loft conversion - £42,248

Granny annexe - £87,248

Garden office - £10,248

Convert a Garage - £16,248

Garage - £18,748

Build a flat roof extension - £22,248

Build a dormer loft conversion - £42,248

Concrete foundations - £6,498

Convert a bungalow loft - £29,248

Convert a basement - £40,290