From £2,480
Trusted and professional extension builder in Ashendon. Experienced in all extension buildering work and keeping within budget and on quote. BUILDR...
From £2,328
Relax... you have found a reliable extension builder in Ashendon. Trew Builders is a friendly and reliable company based in Ashendon who consider n...
From £2,368
Platinum Build Ltd are here to help customers who need an Extension Builder in Ashendon. We offer a competitive rate to complete all your extension...
From £2,456
Thame Builders Ltd: Your Local Professional Building Experts.\n\nAt Thame Builders, we pride ourselves on being more than just a construction compa...
From £2,504
done lots of extensions and refurbishment of houses from 2004-2012 in london from 2012 till now in oxfordshire area.
From £2,648
Trusted and professional extension builder in Ashendon. Experienced in all extension buildering work and keeping within budget and on quote. C HORW...
From £2,440
AMG Roofing (Bucks) Ltd is owned by Ashley Gibson, a small, friendly, family run business that began in 2020, as a result of the Pandemic and an ac...
From £2,360
D M B E BUILDPLUS is an established and experienced local extension builder in Ashendon. Please contact us for a free, no obligation quote and comp...
From £2,280
We are ADC Landscaping & Gardening, owned and run by Ashley Collier. We are a family business based in Aylesbury, Buckinghamshire, and cover all as...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Ashendon it ranges from £2,280 (ADC Landscape And Garden Maintenance Contractors based in HP21) to £2,648 (C HORWOOD CONSTRUCTION based in HP19).
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 Ashendon by posting a job with HaMuch and we will send it to extension builders in Ashendon.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Aylesbury Vale | £36 | £246 |
| Install An RSJ near Aylesbury | £42 | £270 |
| Install An RSJ near Bicester | £35 | £249 |
| Install An RSJ near Cherwell | £35 | £249 |
| Install An RSJ near Oxford | £37 | £265 |
| Install An RSJ near South Oxfordshire | £36 | £253 |
| Install An RSJ near Wycombe | £39 | £271 |
| Install An RSJ near Leighton Buzzard | £38 | £270 |
| Install An RSJ near High Wycombe | £39 | £272 |
| Install An RSJ near Hazlemere | £40 | £272 |
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 - £17,718

Two storey extension - £88,328

Build a timber frame extension - £26,218

Build a swimming pool - £81,218

Single storey extension - £59,368

Side return extension - £43,957

Install an RSJ - £2,418

Outbuilding - £10,218

Build a Mansard loft conversion - £52,218

Loft conversion - £35,798

Build a kitchen extension - £42,218

Hip to gable loft conversion - £42,218

Granny annexe - £87,218

Garden office - £10,218

Convert a Garage - £16,218

Garage - £18,718

Build a flat roof extension - £22,218

Build a dormer loft conversion - £42,218

Concrete foundations - £6,468

Convert a bungalow loft - £29,218

Convert a basement - £39,957