From £2,464
Oxfordshire, OX1
MG Property Maintenance & Services is a trusted extension builder serving customers in Oxfordshire and the surrounding area. Contact us to today to...
From £2,152
Oxfordshire, OX1
Trusted and professional extension builder in Oxfordshire. Experienced in all extension buildering work and keeping within budget and on quote. Des...
From £2,232
CROWN CONSTRUCTION is an established extension buildering business in Oxfordshire. We come highly recommended and provide competitive quotes for yo...
From £2,544
Oxfordshire, OX2
Trusted and professional extension builder in Oxfordshire. Experienced in all extension buildering work and keeping within budget and on quote. Cra...
From £2,424
TNT CONSTRUCTION are here to help customers who need an Extension Builder in Oxfordshire. We offer a competitive rate to complete all your extensio...
From £216
Trusted and professional extension builder in Oxfordshire. Experienced in all extension buildering work and keeping within budget and on quote. Bea...
From £2,056
Oxfordshire, OX3
Trusted and professional extension builder in Oxfordshire. Experienced in all extension buildering work and keeping within budget and on quote. Spa...
From £2,712
Michael E Phillips is an established extension buildering business in Oxfordshire. We come highly recommended and provide competitive quotes for yo...
From £2,392
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,080
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Oxfordshire it ranges from £216 (Beaumont Design & Build Ltd based in OX4) to £2,712 (Michael E Phillips based in OX2).
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 Oxfordshire by posting a job with HaMuch and we will send it to extension builders in Oxfordshire.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Oxford | £37 | £261 |
| Install An RSJ near Abingdon-on-Thames | £35 | £258 |
| Install An RSJ near Didcot | £36 | £266 |
| Install An RSJ near Witney | £32 | £244 |
| Install An RSJ near Cherwell | £35 | £249 |
| Install An RSJ near South Oxfordshire | £36 | £253 |
| Install An RSJ near Bicester | £35 | £249 |
| Install An RSJ near Vale of White Horse | £36 | £271 |
| Install An RSJ near Aylesbury Vale | £36 | £246 |
| Install An RSJ near Aylesbury | £42 | £270 |
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 - £17,427

Two storey extension - £87,891

Build a timber frame extension - £25,927

Build a swimming pool - £80,927

Single storey extension - £53,544

Side return extension - £40,681

Install an RSJ - £2,127

Outbuilding - £9,927

Build a Mansard loft conversion - £51,927

Loft conversion - £33,068

Build a kitchen extension - £41,927

Hip to gable loft conversion - £41,927

Granny annexe - £86,927

Garden office - £9,927

Convert a Garage - £15,927

Garage - £18,427

Build a flat roof extension - £21,927

Build a dormer loft conversion - £41,927

Concrete foundations - £6,177

Convert a bungalow loft - £28,927

Convert a basement - £36,681