From £2,176
Trusted and professional extension builder in SA11. Experienced in all extension buildering work and keeping within budget and on quote. HALL & HAR...
From £1,960
Marin Hughes General Builders is a trusted extension builder serving customers in SA11 and the surrounding area. Contact us to today to get a compe...
From £2,032
Need an Extension Builder in SA11? K.D.L Property Maintenance has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £2,048
SS BUILDER are here to help customers who need an Extension Builder in SA11. We offer a competitive rate to complete all your extension buildering ...
From £1,920
G Wager Building Maintenance is a trusted extension builder serving customers in SA11 and the surrounding area. Contact us to today to get a compet...
From £2,136
A Room at the Top are here to help customers who need an Extension Builder in SA11. We offer a competitive rate to complete all your extension buil...
From £2,152
Trusted and professional extension builder in SA11. Experienced in all extension buildering work and keeping within budget and on quote. Complete B...
From £1,752
Need an Extension Builder in SA11? Calon Construction Ltd has been helping local clients (20 mile radius) with their extension buildering jobs for ...
From £1,832
Karina Lane Construction Ltd are here to help customers who need an Extension Builder in SA11. We offer a competitive rate to complete all your ext...
From £2,024
Evans Home Improvements are here to help customers who need an Extension Builder in SA11. We offer a competitive rate to complete all your extensio...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SA11 it ranges from £1,752 (Calon Construction Ltd based in SA7) to £2,176 (HALL & HARRIS CONSTRUCTION based in SA11).
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 SA11 by posting a job with HaMuch and we will send it to extension builders in SA11.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Neath Port Talbot | £31 | £224 |
| Install An RSJ near Neath | £30 | £225 |
| Install An RSJ near Port Talbot | £31 | £227 |
| Install An RSJ near Maesteg | £38 | £283 |
| Install An RSJ near Swansea | £29 | £230 |
| Install An RSJ near Pyle | £34 | £262 |
| Install An RSJ near Gorseinon | £29 | £228 |
| Install An RSJ near Aberdare | £32 | £212 |
| Install An RSJ near Porthcawl | £33 | £252 |
| Install An RSJ near Bridgend | £32 | £200 |
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 - £17,303

Two storey extension - £87,705

Build a timber frame extension - £25,803

Build a swimming pool - £80,803

Single storey extension - £51,064

Side return extension - £39,286

Install an RSJ - £2,003

Outbuilding - £9,803

Build a Mansard loft conversion - £51,803

Loft conversion - £31,905

Build a kitchen extension - £41,803

Hip to gable loft conversion - £41,803

Granny annexe - £86,803

Garden office - £9,803

Convert a Garage - £15,803

Garage - £18,303

Build a flat roof extension - £21,803

Build a dormer loft conversion - £41,803

Concrete foundations - £6,053

Convert a bungalow loft - £28,803

Convert a basement - £35,286