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Relax... you have found a reliable extension builder in Surrey. GDW Construction is a friendly and reliable company based in Surrey who consider no...
Gani Bush
Gb construction are here to help customers who need an Extension Builder in Surrey. We offer a competitive rate to complete all your extension bui...
From £3,400
Sebastian Banga
Member since August 2025
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...
Relax... you have found a reliable extension builder in Surrey. D & R Roofing & Loft Conversions, Building & Design is a friendly and reliable comp...
Hilton building contractors ltd is a trusted extension builder serving customers in Surrey and the surrounding area. Contact us to today to get a c...
Relax... you have found a reliable extension builder in Surrey. Amazing Space Design and Build Ltd. is a friendly and reliable company based in Sur...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Relax... you have found a reliable extension builder in Surrey. L M G Building Services (London) Ltd is a friendly and reliable company based in Su...
Experienced extension builder ready to quote for your work. Aviemore Building Contractors Ltd is the best extension builder in Surrey. No obligatio...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Surrey 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 Surrey by posting a job with HaMuch and we will send it to extension builders in Surrey.
"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 | £271 |
| Install An RSJ near Redhill | £41 | £269 |
| Install An RSJ near Reigate & Banstead | £41 | £271 |
| Install An RSJ near Croydon | £42 | £267 |
| Install An RSJ near Reigate | £40 | £270 |
| Install An RSJ near Tadworth | £41 | £271 |
| Install An RSJ near Sutton | £43 | £274 |
| Install An RSJ near Epsom | £44 | £275 |
| Install An RSJ near Ewell | £44 | £275 |
| 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 - £17,839

Two storey extension - £88,509

Build a timber frame extension - £26,339

Build a swimming pool - £81,339

Single storey extension - £61,784

Side return extension - £45,316

Install an RSJ - £2,539

Outbuilding - £10,339

Build a Mansard loft conversion - £52,339

Loft conversion - £36,930

Build a kitchen extension - £42,339

Hip to gable loft conversion - £42,339

Granny annexe - £87,339

Garden office - £10,339

Convert a Garage - £16,339

Garage - £18,839

Build a flat roof extension - £22,339

Build a dormer loft conversion - £42,339

Concrete foundations - £6,589

Convert a bungalow loft - £29,339

Convert a basement - £41,316