From £2,456
Need to find an Extension Builder near you for all your extension buildering work?
Collier Roofing provides a local, trusted extension buil...
From £2,504
Whyteleafe, CR3
Need an Extension Builder in Whyteleafe? Ak Construction kasko group ltd has been helping local clients (10 mile radius) with their extension buil...
From £2,304
Need to find an Extension Builder near you for all your extension buildering work?
V & B FACILITIES & BUILDING provides a local, trusted ex...
From £2,184
Surrey, CR3
Rial Build is an established and experienced local extension builder in Whyteleafe. Please contact us for a free, no obligation quote and competiti...
From £2,416
We are a Collectiv of Architects, Engineers, Designers, Technically knowledgeable and time served professionals who have worked side-by-side with ...
From £2,584
Whyteleafe, CR3
Lands Building is an established extension buildering business in Whyteleafe. We come highly recommended and provide competitive quotes for your wo...
From £2,240
Need to find an Extension Builder near you for all your extension buildering work?
D.E.P Building Services Ltd provides a local, trusted ex...
From £2,688
Whyteleafe Surrey, CR3
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £2,240
TP Construction Ltd is an established extension buildering business in Whyteleafe. We come highly recommended and provide competitive quotes for yo...
From £2,304
London, CR3
Linea Home Design Ltd is an established and experienced local extension builder in Whyteleafe. Please contact us for a free, no obligation quote an...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Whyteleafe it ranges from £2,184 (Rial Build based in CR3) to £2,688 (Prestige Building and Landscaping Ltd based in CR3).
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 Whyteleafe by posting a job with HaMuch and we will send it to extension builders in Whyteleafe.
"RSJ installation also I will need help with the cost of theses below IRS extension either the following measurements. L-3m w-3.5m H-Item Site Preparation Groundworks & Foundations Floor Construction Superstructure Roof Construction Windows and External Doors Internal Works Electrical ..." - CR3, job posted 11/08/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Caterham | £43 | £272 |
| Install An RSJ near Redhill | £41 | £269 |
| Install An RSJ near Reigate & Banstead | £41 | £271 |
| Install An RSJ near Croydon | £43 | £267 |
| Install An RSJ near Reigate | £40 | £270 |
| Install An RSJ near Tadworth | £41 | £271 |
| Install An RSJ near Sutton | £43 | £273 |
| Install An RSJ near Epsom | £43 | £274 |
| Install An RSJ near Ewell | £43 | £274 |
| Install An RSJ near Horley | £38 | £258 |
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 - £17,692

Two storey extension - £88,288

Build a timber frame extension - £26,192

Build a swimming pool - £81,192

Single storey extension - £58,840

Side return extension - £43,660

Install an RSJ - £2,392

Outbuilding - £10,192

Build a Mansard loft conversion - £52,192

Loft conversion - £35,550

Build a kitchen extension - £42,192

Hip to gable loft conversion - £42,192

Granny annexe - £87,192

Garden office - £10,192

Convert a Garage - £16,192

Garage - £18,692

Build a flat roof extension - £22,192

Build a dormer loft conversion - £42,192

Concrete foundations - £6,442

Convert a bungalow loft - £29,192

Convert a basement - £39,660