From £2,216
Greater London, WC1V
TipTop Joinery & Build is a trusted extension builder serving customers in WC1V and the surrounding area. Contact us to today to get a competitive ...
From £2,344
House Rendering Ltd is a trusted extension builder serving customers in WC1V and the surrounding area. Contact us to today to get a competitive quo...
From £2,440
Relax... you have found a reliable extension builder in WC1V. HouseUP is a friendly and reliable company based in WC1V who consider no job as too b...
From £2,400
Experienced extension builder ready to quote for your work. My Trusted Builder is the best extension builder in WC1V. No obligation free quotes and...
From £2,224
Need to find an Extension Builder near you for all your extension buildering work?
ORO Projects provides a local, trusted extension builder...
From £2,472
Trusted and professional extension builder in WC1V. Experienced in all extension buildering work and keeping within budget and on quote. ElleHaus h...
From £2,280
Whitehorse Build London offers a full management service running each project from design through to completion, removing many of the hassle associ...
From £2,296
We offer many services in both residential and commercial settings including:BathroomsBuilding & RenovationDecking & PavingDemolitionDoor Installat...
From £2,592
Matstone Projects Limited is an established extension buildering business in WC1V. We come highly recommended and provide competitive quotes for yo...
From £2,240
Rucco Property is a trusted extension builder serving customers in WC1V and the surrounding area. Contact us to today to get a competitive quote fo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in WC1V it ranges from £2,216 (TipTop Joinery & Build based in WC1V) to £2,592 (Matstone Projects Limited based in WC2H).
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 WC1V by posting a job with HaMuch and we will send it to extension builders in WC1V.
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 - £17,650

Two storey extension - £88,226

Build a timber frame extension - £26,150

Build a swimming pool - £81,150

Single storey extension - £58,008

Side return extension - £43,192

Install an RSJ - £2,350

Outbuilding - £10,150

Build a Mansard loft conversion - £52,150

Loft conversion - £35,160

Build a kitchen extension - £42,150

Hip to gable loft conversion - £42,150

Granny annexe - £87,150

Garden office - £10,150

Convert a Garage - £16,150

Garage - £18,650

Build a flat roof extension - £22,150

Build a dormer loft conversion - £42,150

Concrete foundations - £6,400

Convert a bungalow loft - £29,150

Convert a basement - £39,192