From £2,400
WJW Home Improvements - Friendly and professional builders. We specialize in extensions, loft conversions, and big renovation projects. Our motto i...
From £2,328
Relax... you have found a reliable extension builder in OX12. CHF CONSTRUCTION is a friendly and reliable company based in OX12 who consider no job...
From £2,424
SH Carpentry and Construction Ltd is a professional, reliable and friendly carpentry, joinery and general construction company working in and aroun...
From £2,160
Friendly local builder... professional tidy and competitive....
From £2,320
Bluestones Garden Design Ltd is an established and experienced local extension builder in OX12. Please contact us for a free, no obligation quote a...
From £2,400
The business can carry out all aspects of building work:- single or double storey extensions- kitchen and bathroom installations- p...
From £2,304
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,232
Trusted and professional extension builder in OX12. Experienced in all extension buildering work and keeping within budget and on quote. Jamie Lang...
From £2,176
D.Bradbury Property Services are here to help customers who need an Extension Builder in OX12. We offer a competitive rate to complete all your ext...
From £2,296
Trusted and professional extension builder in OX12. Experienced in all extension buildering work and keeping within budget and on quote. Jigsaw Com...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in OX12 it ranges from £2,160 (Threesixfive FM Services Ltd based in OX11) to £2,424 (SH Carpentry & Construction Limited based in OX12).
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 OX12 by posting a job with HaMuch and we will send it to extension builders in OX12.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Vale of White Horse | £36 | £271 |
| Install An RSJ near Didcot | £36 | £266 |
| Install An RSJ near Abingdon-on-Thames | £35 | £258 |
| Install An RSJ near Oxford | £37 | £265 |
| Install An RSJ near Witney | £32 | £244 |
| Install An RSJ near Newbury | £37 | £262 |
| Install An RSJ near Stratton St Margaret | £37 | £238 |
| Install An RSJ near South Oxfordshire | £36 | £253 |
| Install An RSJ near Swindon | £38 | £238 |
| Install An RSJ near Thatcham | £38 | £266 |
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 - £17,604

Two storey extension - £88,156

Build a timber frame extension - £26,104

Build a swimming pool - £81,104

Single storey extension - £57,080

Side return extension - £42,670

Install an RSJ - £2,304

Outbuilding - £10,104

Build a Mansard loft conversion - £52,104

Loft conversion - £34,725

Build a kitchen extension - £42,104

Hip to gable loft conversion - £42,104

Granny annexe - £87,104

Garden office - £10,104

Convert a Garage - £16,104

Garage - £18,604

Build a flat roof extension - £22,104

Build a dormer loft conversion - £42,104

Concrete foundations - £6,354

Convert a bungalow loft - £29,104

Convert a basement - £38,670