From £1,968
Relax... you have found a reliable extension builder in L9. KM Building Services is a friendly and reliable company based in L9 who consider no job...
From £2,104
Need an Extension Builder in L9? Bob the Builder has been helping local clients (20 mile radius) with their extension buildering jobs for many year...
From £2,136
Experienced extension builder ready to quote for your work. P & P Building Services is the best extension builder in L9. No obligation free quotes ...
From £1,960
CJ Construction are here to help customers who need an Extension Builder in L9. We offer a competitive rate to complete all your extension builderi...
From £2,224
Red Avex Ltd are here to help customers who need an Extension Builder in L9. We offer a competitive rate to complete all your extension buildering ...
From £1,672
Trusted and professional extension builder in L9. Experienced in all extension buildering work and keeping within budget and on quote. Jones Landsc...
From £1,752
Liverpool Builder is an established extension buildering business in L9. We come highly recommended and provide competitive quotes for your work.
From £1,872
J.M.C Building Services is a trusted extension builder serving customers in L9 and the surrounding area. Contact us to today to get a competitive q...
From £2,080
Need to find an Extension Builder near you for all your extension buildering work?
Sbetts Building provides a local, trusted extension buil...
From £2,000
McBuild is a trusted extension builder serving customers in L9 and the surrounding area. Contact us to today to get a competitive quote for extensi...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in L9 it ranges from £1,672 (Jones Landscaping based in L30) to £2,224 (Red Avex Ltd based in L10).
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 L9 by posting a job with HaMuch and we will send it to extension builders in L9.
"RSJ installation" - LIVERPOOL, job posted 04/09/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Bootle | £32 | £223 |
| Install An RSJ near Kirkby | £31 | £222 |
| Install An RSJ near Crosby | £34 | £223 |
| Install An RSJ near Maghull | £33 | £219 |
| Install An RSJ near Liverpool | £31 | £222 |
| Install An RSJ near Sefton | £34 | £221 |
| Install An RSJ near Wallasey | £33 | £224 |
| Install An RSJ near Knowsley | £31 | £221 |
| Install An RSJ near Birkenhead | £31 | £219 |
| Install An RSJ near Prescot | £31 | £222 |
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 - £17,277

Two storey extension - £87,665

Build a timber frame extension - £25,777

Build a swimming pool - £80,777

Single storey extension - £50,536

Side return extension - £38,989

Install an RSJ - £1,977

Outbuilding - £9,777

Build a Mansard loft conversion - £51,777

Loft conversion - £31,658

Build a kitchen extension - £41,777

Hip to gable loft conversion - £41,777

Granny annexe - £86,777

Garden office - £9,777

Convert a Garage - £15,777

Garage - £18,277

Build a flat roof extension - £21,777

Build a dormer loft conversion - £41,777

Concrete foundations - £6,027

Convert a bungalow loft - £28,777

Convert a basement - £34,989