From £2,360
D M B E BUILDPLUS is an established and experienced local extension builder in HP19. Please contact us for a free, no obligation quote and competit...
From £2,648
Trusted and professional extension builder in HP19. Experienced in all extension buildering work and keeping within budget and on quote. C HORWOOD ...
From £2,640
Just Lofts are here to help customers who need an Extension Builder in HP19. We offer a competitive rate to complete all your extension buildering ...
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 £2,168
Experienced extension builder ready to quote for your work. VICTOR KING CONSTRUCTION is the best extension builder in HP19. No obligation free quot...
From £2,056
Paul Brennan Building Services is an established extension buildering business in HP19. We come highly recommended and provide competitive quotes f...
From £2,504
Relax... you have found a reliable extension builder in HP19. A J Shaw Building Services is a friendly and reliable company based in HP19 who consi...
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...
From £2,328
THREE HUNDREDS BUILDING LTD are here to help customers who need an Extension Builder in HP19. We offer a competitive rate to complete all your exte...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in HP19 it ranges from £2,056 (Paul Brennan Building Services based in HP22) 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 HP19 by posting a job with HaMuch and we will send it to extension builders in HP19.
"RSJ installation" - HP21
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Aylesbury | £36 | £236 |
| Install An RSJ near Aylesbury Vale | £34 | £230 |
| Install An RSJ near Leighton Buzzard | £33 | £235 |
| Install An RSJ near Berkhamsted | £35 | £227 |
| Install An RSJ near Chesham | £36 | £237 |
| Install An RSJ near Bletchley | £34 | £227 |
| Install An RSJ near Hazlemere | £34 | £235 |
| Install An RSJ near Wycombe | £34 | £234 |
| Install An RSJ near Dunstable | £36 | £235 |
| Install An RSJ near High Wycombe | £34 | £237 |
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 - £17,674

Two storey extension - £88,262

Build a timber frame extension - £26,174

Build a swimming pool - £81,174

Single storey extension - £58,488

Side return extension - £43,462

Install an RSJ - £2,374

Outbuilding - £10,174

Build a Mansard loft conversion - £52,174

Loft conversion - £35,385

Build a kitchen extension - £42,174

Hip to gable loft conversion - £42,174

Granny annexe - £87,174

Garden office - £10,174

Convert a Garage - £16,174

Garage - £18,674

Build a flat roof extension - £22,174

Build a dormer loft conversion - £42,174

Concrete foundations - £6,424

Convert a bungalow loft - £29,174

Convert a basement - £39,462