From £2,192
Trusted and professional extension builder in Redhill. Experienced in all extension buildering work and keeping within budget and on quote. Studio ...
From £2,520
Relax... you have found a reliable extension builder in Redhill. Creations Building & Landscaping is a friendly and reliable company based in Redhi...
From £2,512
Need an Extension Builder in Redhill? PJS Partnership Ltd has been helping local clients (20 mile radius) with their extension buildering jobs for ...
From £2,296
ROLAND KNIGHT CONSTRUCTION LTD is an established and experienced local extension builder in Redhill. Please contact us for a free, no obligation qu...
From £1,992
The Reigate Marble Shop LTD.
Established in 2005, The Reigate Marble Shop...
From £2,128
Upright Construction Ltd is an established and experienced local extension builder in Redhill. Please contact us for a free, no obligation quote an...
From £2,424
Need to find an Extension Builder near you for all your extension buildering work?
S C H BUILDING SERVICES provides a local, trusted extens...
From £2,240
Need an Extension Builder in Redhill? C Dingle Builders & Decorators has been helping local clients (10 mile radius) with their extension builderin...
From £2,104
Experienced extension builder ready to quote for your work. Able Construction T/A is the best extension builder in Redhill. No obligation free quot...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Redhill it ranges from £1,992 (REIGATE MARBLE SHOP based in RH2) to £2,520 (Creations Building & Landscaping based in RH2).
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 Redhill by posting a job with HaMuch and we will send it to extension builders in Redhill.
"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 Redhill | £41 | £269 |
| Install An RSJ near Reigate | £40 | £270 |
| Install An RSJ near Reigate & Banstead | £41 | £271 |
| Install An RSJ near Tadworth | £41 | £271 |
| Install An RSJ near Horley | £38 | £258 |
| Install An RSJ near Caterham | £43 | £272 |
| Install An RSJ near Epsom | £43 | £274 |
| Install An RSJ near Crawley | £38 | £255 |
| Install An RSJ near Ewell | £43 | £274 |
| Install An RSJ near Sutton | £43 | £273 |
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 - £17,566

Two storey extension - £88,098

Build a timber frame extension - £26,066

Build a swimming pool - £81,066

Single storey extension - £56,312

Side return extension - £42,238

Install an RSJ - £2,266

Outbuilding - £10,066

Build a Mansard loft conversion - £52,066

Loft conversion - £34,365

Build a kitchen extension - £42,066

Hip to gable loft conversion - £42,066

Granny annexe - £87,066

Garden office - £10,066

Convert a Garage - £16,066

Garage - £18,566

Build a flat roof extension - £22,066

Build a dormer loft conversion - £42,066

Concrete foundations - £6,316

Convert a bungalow loft - £29,066

Convert a basement - £38,238