Trusted and professional extension builder in S21. Experienced in all extension buildering work and keeping within budget and on quote. MGG CONSTRU...
Looking to Transform Your Home Space?Maison Frais are Space Solution Specialists based in S. Yorkshire. We help TRANSFORM people's family homes to ...
C ROWLEY (SELFBUILD) is an established and experienced local extension builder in S21. Please contact us for a free, no obligation quote and compet...
From £2,336
S. & A. Parsons (Building Contractors) Limited is a trusted extension builder serving customers in S21 and the surrounding area. Contact us to toda...
From £2,112
Oliver Wild Ltd is an established extension buildering business in S21. We come highly recommended and provide competitive quotes for your work.
From £2,384
Trusted and professional extension builder in S21. Experienced in all extension buildering work and keeping within budget and on quote. Maison Frai...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in S21 it ranges from £2,056 (C ROWLEY (SELFBUILD) based in S43) to £2,384 (Maison Frais based in S26).
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 S21 by posting a job with HaMuch and we will send it to extension builders in S21.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Dronfield | £33 | £262 |
| Install An RSJ near Chesterfield | £33 | £257 |
| Install An RSJ near Sheffield | £32 | £261 |
| Install An RSJ near Worksop | £33 | £265 |
| Install An RSJ near Wickersley | £33 | £257 |
| Install An RSJ near Rotherham | £33 | £257 |
| Install An RSJ near Mansfield Woodhouse | £33 | £262 |
| Install An RSJ near Forest Town | £33 | £262 |
| Install An RSJ near Sutton-in-Ashfield | £33 | £264 |
| Install An RSJ near Mansfield | £33 | £261 |
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 - £17,476

Two storey extension - £87,964

Build a timber frame extension - £25,976

Build a swimming pool - £80,976

Single storey extension - £54,520

Side return extension - £41,230

Install an RSJ - £2,176

Outbuilding - £9,976

Build a Mansard loft conversion - £51,976

Loft conversion - £33,525

Build a kitchen extension - £41,976

Hip to gable loft conversion - £41,976

Granny annexe - £86,976

Garden office - £9,976

Convert a Garage - £15,976

Garage - £18,476

Build a flat roof extension - £21,976

Build a dormer loft conversion - £41,976

Concrete foundations - £6,226

Convert a bungalow loft - £28,976

Convert a basement - £37,230