From £2,104
Bow Tie Construction is an established and experienced local extension builder in HP12. Please contact us for a free, no obligation quote and compe...
From £2,520
Trusted and professional extension builder in HP12. Experienced in all extension buildering work and keeping within budget and on quote. Shaks buil...
From £1,496
we supply and install carpets and vinyl flooring, small family business , covering a ten mike radius of high wycombe, with a choose at home sample ...
From £2,288
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,104
Experienced extension builder ready to quote for your work. Wooburn Project Management Ltd is the best extension builder in HP12. No obligation fre...
From £2,624
Here at S Halls Construction Ltd, we undertake all hard landscaping works. Patios, driveways, fencing and groundworks, we also cover many areas of ...
From £2,504
Relax... you have found a reliable extension builder in HP12. JAMES BUILDERS is a friendly and reliable company based in HP12 who consider no job a...
From £2,288
Need to find an Extension Builder near you for all your extension buildering work?
PSB Builders Ltd provides a local, trusted extension bui...
From £2,296
Relax... you have found a reliable extension builder in HP12. Building High Wycombe is a friendly and reliable company based in HP12 who consider n...
From £2,600
Lazor Construction Ltd are here to help customers who need an Extension Builder in HP12. We offer a competitive rate to complete all your extension...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in HP12 it ranges from £1,496 (Andy's carpets & Vinyl services based in HP12) to £2,624 (S Halls Construction Ltd based in HP13).
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 HP12 by posting a job with HaMuch and we will send it to extension builders in HP12.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near High Wycombe | £39 | £272 |
| Install An RSJ near Wycombe | £39 | £271 |
| Install An RSJ near Hazlemere | £40 | £272 |
| Install An RSJ near Maidenhead | £41 | £273 |
| Install An RSJ near Chesham | £42 | £277 |
| Install An RSJ near Gerrards Cross | £43 | £282 |
| Install An RSJ near Slough | £42 | £272 |
| Install An RSJ near Windsor & Maidenhead | £42 | £272 |
| Install An RSJ near Windsor | £41 | £271 |
| Install An RSJ near Rickmansworth | £42 | £278 |
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 - £17,582

Two storey extension - £88,124

Build a timber frame extension - £26,082

Build a swimming pool - £81,082

Single storey extension - £56,648

Side return extension - £42,427

Install an RSJ - £2,282

Outbuilding - £10,082

Build a Mansard loft conversion - £52,082

Loft conversion - £34,523

Build a kitchen extension - £42,082

Hip to gable loft conversion - £42,082

Granny annexe - £87,082

Garden office - £10,082

Convert a Garage - £16,082

Garage - £18,582

Build a flat roof extension - £22,082

Build a dormer loft conversion - £42,082

Concrete foundations - £6,332

Convert a bungalow loft - £29,082

Convert a basement - £38,427