Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Banstead. No obligation free qu...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Gani Bush
Gb construction are here to help customers who need an Extension Builder in Banstead. We offer a competitive rate to complete all your extension b...
Sebastian Banga
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
Trusted and professional extension builder in Banstead. Experienced in all extension buildering work and keeping within budget and on quote. CSJ Bu...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
PW Construction & Renovation Ltd is a trusted extension builder serving customers in Banstead and the surrounding area. Contact us to today to get ...
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
Albdeco Builders & Decorators Ltd is a trusted extension builder serving customers in Banstead and the surrounding area. Contact us to today to get...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Banstead it ranges from £2,136 (Masters Property Services based in SM5) to £3,400 (Banga Decoration based in CR7).
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 Banstead by posting a job with HaMuch and we will send it to extension builders in Banstead.
"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 Epsom | £43 | £274 |
| Install An RSJ near Reigate & Banstead | £41 | £271 |
| Install An RSJ near Tadworth | £41 | £271 |
| Install An RSJ near Ewell | £43 | £274 |
| Install An RSJ near Sutton | £43 | £273 |
| Install An RSJ near Merton | £43 | £272 |
| Install An RSJ near Caterham | £43 | £271 |
| Install An RSJ near Reigate | £40 | £270 |
| Install An RSJ near Redhill | £41 | £269 |
| Install An RSJ near Croydon | £42 | £267 |
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 - £17,781

Two storey extension - £88,421

Build a timber frame extension - £26,281

Build a swimming pool - £81,281

Single storey extension - £60,616

Side return extension - £44,659

Install an RSJ - £2,481

Outbuilding - £10,281

Build a Mansard loft conversion - £52,281

Loft conversion - £36,383

Build a kitchen extension - £42,281

Hip to gable loft conversion - £42,281

Granny annexe - £87,281

Garden office - £10,281

Convert a Garage - £16,281

Garage - £18,781

Build a flat roof extension - £22,281

Build a dormer loft conversion - £42,281

Concrete foundations - £6,531

Convert a bungalow loft - £29,281

Convert a basement - £40,659