From £1,952
Need to find an Extension Builder near you for all your extension buildering work?
JM Builders Service provides a local, trusted extension ...
From £2,088
Denis Gleeson is an established extension buildering business in M20. We come highly recommended and provide competitive quotes for your work.
...From £1,960
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,256
We cover all aspects of domestic construction management ,bespoke finishes , extensions ,coloured render-full refurbishment , use high end material...
From £2,136
K T Builders Ltd is a trusted extension builder serving customers in M20 and the surrounding area. Contact us to today to get a competitive quote f...
From £2,056
Bespoke BC should be your first port of call for all building jobs; from landscaping and ground work, to full renovations and everything in between...
From £1,888
Blue Square Construction is an established and experienced local extension builder in M20. Please contact us for a free, no obligation quote and co...
From £1,880
RKF Constructions are here to help customers who need an Extension Builder in M20. We offer a competitive rate to complete all your extension build...
From £1,936
Need to find an Extension Builder near you for all your extension buildering work?
J K S Builder provides a local, trusted extension builde...
From £1,968
Trusted and professional extension builder in M20. Experienced in all extension buildering work and keeping within budget and on quote. B R M S hav...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in M20 it ranges from £1,880 (RKF Constructions based in SK8) to £2,256 (Superiorum contractor & consultant based in M21).
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 M20 by posting a job with HaMuch and we will send it to extension builders in M20.
"RSJ installation replacing a badly installed RSJ that supports a wall between the old kitchen and rear lounge. The original builder installed the incorrect weight (not heavy enough) and then proceeded to put a suppirt bar underneath by welding. The weld buckled the beam and this is how its been..." - SK4, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Gatley | £31 | £230 |
| Install An RSJ near Old Trafford | £32 | £236 |
| Install An RSJ near Reddish | £34 | £236 |
| Install An RSJ near Wythenshawe | £31 | £229 |
| Install An RSJ near Cheadle Hulme | £31 | £232 |
| Install An RSJ near Stretford | £32 | £235 |
| Install An RSJ near Manchester | £32 | £236 |
| Install An RSJ near Sale | £32 | £235 |
| Install An RSJ near Stockport | £35 | £234 |
| Install An RSJ near Salford | £32 | £238 |
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 - £17,312

Two storey extension - £87,718

Build a timber frame extension - £25,812

Build a swimming pool - £80,812

Single storey extension - £51,240

Side return extension - £39,385

Install an RSJ - £2,012

Outbuilding - £9,812

Build a Mansard loft conversion - £51,812

Loft conversion - £31,988

Build a kitchen extension - £41,812

Hip to gable loft conversion - £41,812

Granny annexe - £86,812

Garden office - £9,812

Convert a Garage - £15,812

Garage - £18,312

Build a flat roof extension - £21,812

Build a dormer loft conversion - £41,812

Concrete foundations - £6,062

Convert a bungalow loft - £28,812

Convert a basement - £35,385