From £2,576
Southall, UB1
D.S Builders is a trusted extension builder serving customers in UB1 and the surrounding area. Contact us to today to get a competitive quote for e...
From £1,640
Experienced extension builder ready to quote for your work. Kairon Construction is the best extension builder in UB1. No obligation free quotes and...
From £2,648
Greater London, UB1
Need an Extension Builder in UB1? House Builders London has been helping local clients (10 mile radius) with their extension buildering jobs for ma...
From £2,464
Need an Extension Builder in UB1? S.K Singh has been helping local clients (10 mile radius) with their extension buildering jobs for many years. Ge...
From £2,360
Trusted and professional extension builder in UB1. Experienced in all extension buildering work and keeping within budget and on quote. BAL CONSTRU...
From £2,608
Need an Extension Builder in UB1? Marz Building Maintenance has been helping local clients (10 mile radius) with their extension buildering jobs fo...
From £2,208
Berkshire, UB1
Relax... you have found a reliable extension builder in UB1. Randhawa Design & Build Ltd is a friendly and reliable company based in UB1 who consid...
From £2,464
United Design & Build Ltd is an established extension buildering business in UB1. We come highly recommended and provide competitive quotes for you...
From £2,608
Southall, UB1
Relax... you have found a reliable extension builder in UB1. RAJ BUILDING CONTRACTORS LTD is a friendly and reliable company based in UB1 who consi...
From £2,360
F&S BUILDERS LTD is an established and experienced local extension builder in UB1. Please contact us for a free, no obligation quote and competitiv...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in UB1 it ranges from £1,640 (Kairon Construction based in UB1) to £2,648 (House Builders London based in UB1).
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 UB1 by posting a job with HaMuch and we will send it to extension builders in UB1.
| Borough in London |
|---|
| Install An RSJ in Southall |
| Install An RSJ in Southall |
| Install An RSJ in Yeading |
| Install An RSJ in Hanwell |
| Install An RSJ in Northolt |
| Install An RSJ in Greenford |
| Install An RSJ in Hayes |
| Install An RSJ in West Ealing |
| Install An RSJ in Heston |
| Install An RSJ in Ealing |
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 - £17,694

Two storey extension - £88,290

Build a timber frame extension - £26,194

Build a swimming pool - £81,194

Single storey extension - £58,872

Side return extension - £43,678

Install an RSJ - £2,394

Outbuilding - £10,194

Build a Mansard loft conversion - £52,194

Loft conversion - £35,565

Build a kitchen extension - £42,194

Hip to gable loft conversion - £42,194

Granny annexe - £87,194

Garden office - £10,194

Convert a Garage - £16,194

Garage - £18,694

Build a flat roof extension - £22,194

Build a dormer loft conversion - £42,194

Concrete foundations - £6,444

Convert a bungalow loft - £29,194

Convert a basement - £39,678