From £2,640
We specialize in residential and commercial developments , delivering a highly personalized and professional customer focused service.We have skil...
From £2,616
Greater London, UB8
Trusted and professional extension builder in Uxbridge. Experienced in all extension buildering work and keeping within budget and on quote. CC Bui...
From £2,152
Need an Extension Builder in Uxbridge? Peter Cox Ltd - Uxbridge has been helping local clients (10 mile radius) with their extension buildering job...
From £2,128
Uxbridge, UB8
G S Builders are here to help customers who need an Extension Builder in Uxbridge. We offer a competitive rate to complete all your extension build...
From £2,640
Led by Interior Designer, Carly O'Driscoll-Dommett, Island Exhibitions Residential Interiors provide beautiful & exceptional interiors, to make the...
From £2,232
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,544
Need an Extension Builder in Uxbridge? Galacticon has been helping local clients (10 mile radius) with their extension buildering jobs for many yea...
From £2,416
Uxbridge, UB8
Need an Extension Builder in Uxbridge? MEAD BUILDING SERVICES LTD has been helping local clients (10 mile radius) with their extension buildering j...
From £2,272
At CC Builders UK Development, we offer solutions for all aspects of construction for both domestic and commercial clients throughout London and th...
From £2,632
Uxbridge, UB8
GMB BUILDING SERVICES is an established and experienced local extension builder in Uxbridge. Please contact us for a free, no obligation quote and ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Uxbridge it ranges from £2,128 (G S Builders based in UB8) to £2,640 (PB Viking Construction Ltd based in UB8).
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 Uxbridge by posting a job with HaMuch and we will send it to extension builders in Uxbridge.
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 - £17,727

Two storey extension - £88,341

Build a timber frame extension - £26,227

Build a swimming pool - £81,227

Single storey extension - £59,544

Side return extension - £44,056

Install an RSJ - £2,427

Outbuilding - £10,227

Build a Mansard loft conversion - £52,227

Loft conversion - £35,880

Build a kitchen extension - £42,227

Hip to gable loft conversion - £42,227

Granny annexe - £87,227

Garden office - £10,227

Convert a Garage - £16,227

Garage - £18,727

Build a flat roof extension - £22,227

Build a dormer loft conversion - £42,227

Concrete foundations - £6,477

Convert a bungalow loft - £29,227

Convert a basement - £40,056