From £2,184
BP Builders are here to help customers who need an Extension Builder in S81. We offer a competitive rate to complete all your extension buildering ...
From £2,288
Hallamshire Paving is an established and experienced local extension builder in S81. Please contact us for a free, no obligation quote and competit...
From £2,456
Woodtec Joinery is an established extension buildering business in S81. We come highly recommended and provide competitive quotes for your work.
From £2,544
Trusted and professional extension builder in S81. Experienced in all extension buildering work and keeping within budget and on quote. AMB Joinery...
From £2,208
We are a family run business with 20 years experience.
We take great care and attention to the work we carry out and pride ourselves on ...
From £2,192
Need to find an Extension Builder near you for all your extension buildering work?
A B Building Roofing Services provides a local, trusted ...
From £2,168
Relax... you have found a reliable extension builder in S81. CS Construction & Conversions is a friendly and reliable company based in S81 who cons...
From £2,136
Trusted and professional extension builder in S81. Experienced in all extension buildering work and keeping within budget and on quote. Merebrook C...
From £2,136
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...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in S81 it ranges from £1,488 (JON WINDLE CONSTRUCTION based in S17) to £2,544 (AMB Joinery & Building Services based in S8).
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 S81 by posting a job with HaMuch and we will send it to extension builders in S81.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Worksop | £33 | £265 |
| Install An RSJ near Bassetlaw | £31 | £243 |
| Install An RSJ near Retford | £31 | £243 |
| 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 Doncaster | £29 | £238 |
| Install An RSJ near Mansfield | £33 | £261 |
| Install An RSJ near Sheffield | £32 | £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 - £17,480

Two storey extension - £87,970

Build a timber frame extension - £25,980

Build a swimming pool - £80,980

Single storey extension - £54,600

Side return extension - £41,275

Install an RSJ - £2,180

Outbuilding - £9,980

Build a Mansard loft conversion - £51,980

Loft conversion - £33,563

Build a kitchen extension - £41,980

Hip to gable loft conversion - £41,980

Granny annexe - £86,980

Garden office - £9,980

Convert a Garage - £15,980

Garage - £18,480

Build a flat roof extension - £21,980

Build a dormer loft conversion - £41,980

Concrete foundations - £6,230

Convert a bungalow loft - £28,980

Convert a basement - £37,275