From £2,056
Trusted and professional extension builder in OX3. Experienced in all extension buildering work and keeping within budget and on quote. Spatial des...
From £2,296
Trusted and professional extension builder in OX3. Experienced in all extension buildering work and keeping within budget and on quote. E.N.K. Cons...
From £2,368
Singh Builders is an established extension buildering business in OX3. We come highly recommended and provide competitive quotes for your work.
...From £2,424
TNT CONSTRUCTION are here to help customers who need an Extension Builder in OX3. We offer a competitive rate to complete all your extension builde...
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 £2,232
CROWN CONSTRUCTION is an established extension buildering business in OX3. We come highly recommended and provide competitive quotes for your work....
From £2,416
Need to find an Extension Builder near you for all your extension buildering work?
BA Knott Oxford Ltd provides a local, trusted extension ...
From £216
Trusted and professional extension builder in OX3. Experienced in all extension buildering work and keeping within budget and on quote. Beaumont De...
From £2,192
Need to find an Extension Builder near you for all your extension buildering work?
Brian Watts Partners Ltd provides a local, trusted exten...
From £2,544
Trusted and professional extension builder in OX3. Experienced in all extension buildering work and keeping within budget and on quote. Crawford & ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in OX3 it ranges from £216 (Beaumont Design & Build Ltd based in OX4) to £2,544 (Crawford & Co. Construction Ltd. 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 OX3 by posting a job with HaMuch and we will send it to extension builders in OX3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Oxford | £37 | £265 |
| Install An RSJ near Abingdon-on-Thames | £35 | £258 |
| 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 Didcot | £36 | £266 |
| Install An RSJ near Witney | £32 | £244 |
| 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 - £17,414

Two storey extension - £87,870

Build a timber frame extension - £25,914

Build a swimming pool - £80,914

Single storey extension - £53,272

Side return extension - £40,528

Install an RSJ - £2,114

Outbuilding - £9,914

Build a Mansard loft conversion - £51,914

Loft conversion - £32,940

Build a kitchen extension - £41,914

Hip to gable loft conversion - £41,914

Granny annexe - £86,914

Garden office - £9,914

Convert a Garage - £15,914

Garage - £18,414

Build a flat roof extension - £21,914

Build a dormer loft conversion - £41,914

Concrete foundations - £6,164

Convert a bungalow loft - £28,914

Convert a basement - £36,528