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 £2,480
Member since August 2026
Relax... you have found a reliable extension builder in HP14. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in HP14 who co...
From £2,496
Pinnacle Property Services is a trusted extension builder serving customers in HP14 and the surrounding area. Contact us to today to get a competit...
From £2,296
Matharu Buildings is an established extension buildering business in HP14. We come highly recommended and provide competitive quotes for your work....
From £2,624
Sharp Building Ltd is an established and experienced local extension builder in HP14. Please contact us for a free, no obligation quote and competi...
From £2,200
Member since July 2020
EB Construction & Building Ltd are here to help customers who need an Extension Builder in HP14. We offer a competitive rate to complete all your e...
From £2,536
Ohanaa Ltd is a trusted extension builder serving customers in HP14 and the surrounding area. Contact us to today to get a competitive quote for ex...
From £2,664
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 £2,360
EGPM LTD are here to help customers who need an Extension Builder in HP14. We offer a competitive rate to complete all your extension buildering jo...
From £2,312
JASON SHARP SHARP BUILDERS is a trusted extension builder serving customers in HP14 and the surrounding area. Contact us to today to get a competit...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in HP14 it ranges from £2,200 (EB Construction & Building Ltd based in HP2) to £2,664 (AV Home Improvements based in WD19).
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 HP14 by posting a job with HaMuch and we will send it to extension builders in HP14.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Wycombe | £39 | £271 |
| Install An RSJ near High Wycombe | £39 | £272 |
| 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 South Oxfordshire | £36 | £253 |
| Install An RSJ near Aylesbury | £42 | £270 |
| Install An RSJ near Gerrards Cross | £43 | £282 |
| Install An RSJ near Caversham | £38 | £265 |
| Install An RSJ near Slough | £42 | £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 - £17,736

Two storey extension - £88,354

Build a timber frame extension - £26,236

Build a swimming pool - £81,236

Single storey extension - £59,720

Side return extension - £44,155

Install an RSJ - £2,436

Outbuilding - £10,236

Build a Mansard loft conversion - £52,236

Loft conversion - £35,963

Build a kitchen extension - £42,236

Hip to gable loft conversion - £42,236

Granny annexe - £87,236

Garden office - £10,236

Convert a Garage - £16,236

Garage - £18,736

Build a flat roof extension - £22,236

Build a dormer loft conversion - £42,236

Concrete foundations - £6,486

Convert a bungalow loft - £29,236

Convert a basement - £40,155