From £1,840
Lee Construction (LDG) Ltd is a trusted extension builder serving customers in DL10 and the surrounding area. Contact us to today to get a competit...
From £2,048
Need to find an Extension Builder near you for all your extension buildering work?
Victory Procurement Solutions provides a local, trusted...
From £1,928
GURKHA CONSTRUCTION SVCS LTD is a trusted extension builder serving customers in DL10 and the surrounding area. Contact us to today to get a compet...
From £1,832
Partek Site Services is an established and experienced local extension builder in DL10. Please contact us for a free, no obligation quote and compe...
From £1,960
Trusted and professional extension builder in DL10. Experienced in all extension buildering work and keeping within budget and on quote. D & G Buil...
From £1,920
S & K Windows are here to help customers who need an Extension Builder in DL10. We offer a competitive rate to complete all your extension builderi...
From £2,408
Experienced extension builder ready to quote for your work. pidesigns is the best extension builder in DL10. No obligation free quotes and many hap...
From £2,072
Hi I'm darren
I'm a fully qualified time served joiner I have been doing it for 30 years and have been self employed for 12 years ...
From £2,080
Relax... you have found a reliable extension builder in DL10. Under Pressure is a friendly and reliable company based in DL10 who consider no job a...
From £1,992
Relax... you have found a reliable extension builder in DL10. Darlington Building Services is a friendly and reliable company based in DL10 who con...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in DL10 it ranges from £1,832 (Partek Site Services based in DL2) to £2,408 (Pidesigns based in DL1).
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 DL10 by posting a job with HaMuch and we will send it to extension builders in DL10.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Darlington | £53 | £194 |
| Install An RSJ near Newton Aycliffe | £34 | £200 |
| Install An RSJ near Ingleby Barwick | £36 | £202 |
| Install An RSJ near Bishop Auckland | £34 | £218 |
| Install An RSJ near Stockton-on-Tees | £35 | £201 |
| Install An RSJ near Thornaby-on-Tees | £36 | £202 |
| Install An RSJ near Spennymoor | £33 | £220 |
| Install An RSJ near Billingham | £37 | £208 |
| Install An RSJ near Middlesbrough | £36 | £202 |
| Install An RSJ near Eston | £35 | £215 |
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 - £17,308

Two storey extension - £87,712

Build a timber frame extension - £25,808

Build a swimming pool - £80,808

Single storey extension - £51,160

Side return extension - £39,340

Install an RSJ - £2,008

Outbuilding - £9,808

Build a Mansard loft conversion - £51,808

Loft conversion - £31,950

Build a kitchen extension - £41,808

Hip to gable loft conversion - £41,808

Granny annexe - £86,808

Garden office - £9,808

Convert a Garage - £15,808

Garage - £18,308

Build a flat roof extension - £21,808

Build a dormer loft conversion - £41,808

Concrete foundations - £6,058

Convert a bungalow loft - £28,808

Convert a basement - £35,340