Need to find an Extension Builder near you for all your extension buildering work?
D Parker Design & Build provides a local, trusted extens...
Blackburn, BB1
WM Brickwork & Pointing are here to help customers who need an Extension Builder in Blackburn. We offer a competitive rate to complete all your ext...
Darren Gaynor is a trusted extension builder serving customers in Blackburn and the surrounding area. Contact us to today to get a competitive quot...
Blackburn, BB1
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Need an Extension Builder in Blackburn? NOBLETT BUILDING SERVICES has been helping local clients (20 mile radius) with their extension buildering j...
Need to find an Extension Builder near you for all your extension buildering work?
J. Grimshaw provides a local, trusted extension builderi...
Blackburn, BB1
Lonsdale Construction is a trusted extension builder serving customers in Blackburn and the surrounding area. Contact us to today to get a competit...
Ash
Blackburn, BB1
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Comprehensive Property Services is an established and experienced local extension builder in Blackburn. Please contact us for a free, no obligation...
Trusted and professional extension builder in Blackburn. Experienced in all extension buildering work and keeping within budget and on quote. O. Mo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Blackburn it ranges from £1,752 (Comprehensive Property Services based in PR1) to £2,200 (O. Morris Construction based in PR5).
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 Blackburn by posting a job with HaMuch and we will send it to extension builders in Blackburn.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Blackburn | £33 | £247 |
| Install An RSJ near Darwen | £34 | £255 |
| Install An RSJ near Accrington | £33 | £244 |
| Install An RSJ near Bamber Bridge | £30 | £216 |
| Install An RSJ near Chorley | £30 | £221 |
| Install An RSJ near Rawtenstall | £29 | £213 |
| Install An RSJ near Preston | £30 | £218 |
| Install An RSJ near Leyland | £30 | £223 |
| Install An RSJ near Fulwood | £31 | £217 |
| Install An RSJ near Burnley | £29 | £219 |
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 - £17,268

Two storey extension - £87,652

Build a timber frame extension - £25,768

Build a swimming pool - £80,768

Single storey extension - £50,360

Side return extension - £38,890

Install an RSJ - £1,968

Outbuilding - £9,768

Build a Mansard loft conversion - £51,768

Loft conversion - £31,575

Build a kitchen extension - £41,768

Hip to gable loft conversion - £41,768

Granny annexe - £86,768

Garden office - £9,768

Convert a Garage - £15,768

Garage - £18,268

Build a flat roof extension - £21,768

Build a dormer loft conversion - £41,768

Concrete foundations - £6,018

Convert a bungalow loft - £28,768

Convert a basement - £34,890