From £1,920
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,984
Lancashire, BB1
Need to find an Extension Builder near you for all your extension buildering work?
D Parker Design & Build provides a local, trusted extens...
From £2,056
Lancashire, BB1
Need an Extension Builder in Lancashire? Smart building solutions Blackburn ltd has been helping local clients (20 mile radius) with their extensio...
From £1,912
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,824
WM Brickwork & Pointing are here to help customers who need an Extension Builder in Lancashire. We offer a competitive rate to complete all your ex...
From £2,128
M. Pickering Builder & Joiner is a trusted extension builder serving customers in Lancashire and the surrounding area. Contact us to today to get a...
From £1,936
Need to find an Extension Builder near you for all your extension buildering work?
East Lancs Construction Ltd provides a local, trusted ex...
From £2,016
BRYAN LEE BUILDING CONST LTD is an established and experienced local extension builder in Lancashire. Please contact us for a free, no obligation q...
From £1,928
Lonsdale Construction is a trusted extension builder serving customers in Lancashire and the surrounding area. Contact us to today to get a competi...
From £2,008
Need to find an Extension Builder near you for all your extension buildering work?
J. Grimshaw provides a local, trusted extension builderi...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Lancashire it ranges from £1,824 (WM Brickwork & Pointing based in BB1) to £2,128 (M. Pickering Builder & Joiner based in BB2).
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 Lancashire by posting a job with HaMuch and we will send it to extension builders in Lancashire.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Blackburn | £33 | £246 |
| Install An RSJ near Accrington | £33 | £243 |
| Install An RSJ near Darwen | £34 | £253 |
| Install An RSJ near Rawtenstall | £29 | £213 |
| Install An RSJ near Bamber Bridge | £30 | £216 |
| Install An RSJ near Chorley | £30 | £221 |
| Install An RSJ near Burnley | £29 | £219 |
| Install An RSJ near Preston | £30 | £218 |
| Install An RSJ near Leyland | £30 | £223 |
| Install An RSJ near Fulwood | £31 | £217 |
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 - £17,271

Two storey extension - £87,657

Build a timber frame extension - £25,771

Build a swimming pool - £80,771

Single storey extension - £50,424

Side return extension - £38,926

Install an RSJ - £1,971

Outbuilding - £9,771

Build a Mansard loft conversion - £51,771

Loft conversion - £31,605

Build a kitchen extension - £41,771

Hip to gable loft conversion - £41,771

Granny annexe - £86,771

Garden office - £9,771

Convert a Garage - £15,771

Garage - £18,271

Build a flat roof extension - £21,771

Build a dormer loft conversion - £41,771

Concrete foundations - £6,021

Convert a bungalow loft - £28,771

Convert a basement - £34,926