Homeowners look no further if you want a qualified extension builder to work in your home. LCD Pixel Construction Ltd are tidy and neat, providing ...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Need to find an Extension Builder near you for all your extension buildering work?
DPP Construction (David Price Partnership) provides a lo...
Trusted and professional extension builder in Redhill. Experienced in all extension buildering work and keeping within budget and on quote. D B Jon...
ALBANA PERANA
The Reigate Marble Shop LTD.
Established in 2005, The Reigate Marble Shop...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Need to find an Extension Builder near you for all your extension buildering work?
S C H BUILDING SERVICES provides a local, trusted extens...
Crawley Construction Ltd
Contact us: 07454160840 Email: enquiries@ We are a family run business since 15 year’s+. We are build on tru...
J S Nisbet Loft Conversions are here to help customers who need an Extension Builder in Redhill. We offer a competitive rate to complete all your e...

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 £2,528 (J Stevens Roofing & Guttering based in KT18).
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 | £271 |
| 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 - £17,570

Two storey extension - £88,106

Build a timber frame extension - £26,070

Build a swimming pool - £81,070

Single storey extension - £56,408

Side return extension - £42,292

Install an RSJ - £2,270

Outbuilding - £10,070

Build a Mansard loft conversion - £52,070

Loft conversion - £34,410

Build a kitchen extension - £42,070

Hip to gable loft conversion - £42,070

Granny annexe - £87,070

Garden office - £10,070

Convert a Garage - £16,070

Garage - £18,570

Build a flat roof extension - £22,070

Build a dormer loft conversion - £42,070

Concrete foundations - £6,320

Convert a bungalow loft - £29,070

Convert a basement - £38,292