From £2,232
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £1,912
Witney, OX28
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,232
Experienced extension builder ready to quote for your work. MILLHOUSE CONSTRUCTION LIMITED is the best extension builder in Witney. No obligation f...
From £2,120
Witney, OX29
Relax... you have found a reliable extension builder in Witney. TG Projects Ltd is a friendly and reliable company based in Witney who consider no ...
From £2,192
DH Building Services (Oxford) Ltd are a family-owned building firm based in Witney with over 30 years of experience providing professional, trustwo...
From £2,624
Trusted and professional extension builder in Witney. Experienced in all extension buildering work and keeping within budget and on quote. Millrick...
From £2,160
APPLEWOOD CONSTRUCTION is a trusted extension builder serving customers in Witney and the surrounding area. Contact us to today to get a competitiv...
From £2,184
Lambert Home Builds is a trusted extension builder serving customers in Witney and the surrounding area. Contact us to today to get a competitive q...
From £2,440
Approved extension builder in Witney, covering 20 miles.
Whatever extension buildering work you need, including emergency repairs, hire a co...
From £2,544
Need an Extension Builder in Witney? Yarnton Leisure Buildings has been helping local clients (20 mile radius) with their extension buildering jobs...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Witney it ranges from £1,912 (Reece Berry Building Contractor based in OX28) to £2,624 (Millrick Construction based in OX18).
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 Witney by posting a job with HaMuch and we will send it to extension builders in Witney.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Witney | £32 | £244 |
| Install An RSJ near Oxford | £37 | £265 |
| Install An RSJ near Vale of White Horse | £36 | £271 |
| Install An RSJ near Abingdon-on-Thames | £35 | £258 |
| Install An RSJ near Cherwell | £35 | £249 |
| Install An RSJ near Bicester | £35 | £249 |
| Install An RSJ near Didcot | £36 | £266 |
| Install An RSJ near Stratton St Margaret | £37 | £238 |
| Install An RSJ near Thamesdown | £38 | £239 |
| Install An RSJ near South Oxfordshire | £36 | £253 |
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 - £17,564

Two storey extension - £88,096

Build a timber frame extension - £26,064

Build a swimming pool - £81,064

Single storey extension - £56,280

Side return extension - £42,220

Install an RSJ - £2,264

Outbuilding - £10,064

Build a Mansard loft conversion - £52,064

Loft conversion - £34,350

Build a kitchen extension - £42,064

Hip to gable loft conversion - £42,064

Granny annexe - £87,064

Garden office - £10,064

Convert a Garage - £16,064

Garage - £18,564

Build a flat roof extension - £22,064

Build a dormer loft conversion - £42,064

Concrete foundations - £6,314

Convert a bungalow loft - £29,064

Convert a basement - £38,220