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Select your affordable S18 extension builder
Trusted and professional extension builder in S18. Experienced in all extension buildering work and keeping within budget and on quote. AMB Joinery...
Dore Decor are a family run business with over 30 years experience - we offer an extensive range of building services and are able to provide a ful...
From £2,568
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,168
Trusted and professional extension builder in S18. Experienced in all extension buildering work and keeping within budget and on quote. R S Heating...
From £2,592
Peak Roofclean offer an inexpensive way of permanently keeping your roof free of moss, lichens and algae. Not only is it 100% effective but...
From £2,272
Need an Extension Builder in S18? Cortworth Millhouse Design & Build has been helping local clients (20 mile radius) with their extension builderin...
From £2,536
Blenheim Park Developments is an established and experienced local extension builder in S18. Please contact us for a free, no obligation quote and ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in S18 it ranges from £1,488 (JON WINDLE CONSTRUCTION based in S17) to £2,592 (Peak Roof Clean based in S42).
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 S18 by posting a job with HaMuch and we will send it to extension builders in S18.
| 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 Rotherham | £32 | £257 |
| Install An RSJ near Wickersley | £32 | £258 |
| Install An RSJ near Worksop | £33 | £265 |
| Install An RSJ near Alfreton | £34 | £261 |
| Install An RSJ near Sutton-in-Ashfield | £33 | £264 |
| Install An RSJ near Mansfield Woodhouse | £33 | £262 |
| Install An RSJ near Kirkby-in-Ashfield | £34 | £269 |
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 - £17,588

Two storey extension - £88,132

Build a timber frame extension - £26,088

Build a swimming pool - £81,088

Single storey extension - £56,760

Side return extension - £42,490

Install an RSJ - £2,288

Outbuilding - £10,088

Build a Mansard loft conversion - £52,088

Loft conversion - £34,575

Build a kitchen extension - £42,088

Hip to gable loft conversion - £42,088

Granny annexe - £87,088

Garden office - £10,088

Convert a Garage - £16,088

Garage - £18,588

Build a flat roof extension - £22,088

Build a dormer loft conversion - £42,088

Concrete foundations - £6,338

Convert a bungalow loft - £29,088

Convert a basement - £38,490