From £2,480
Member since August 2026
Relax... you have found a reliable extension builder in Watermead. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in Waterm...
From £2,432
If you are looking for a Watermead extension builder and you need something replaced, fitted, or fixed, contact Space Above Limited today. We are c...
From £2,200
Member since July 2020
EB Construction & Building Ltd are here to help customers who need an Extension Builder in Watermead. We offer a competitive rate to complete all y...
From £2,544
Trusted and professional extension builder in Watermead. Experienced in all extension buildering work and keeping within budget and on quote. Peter...
From £2,136
Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..
From £2,536
Ohanaa Ltd is a trusted extension builder serving customers in Watermead and the surrounding area. Contact us to today to get a competitive quote f...
From £2,312
JASON SHARP SHARP BUILDERS is a trusted extension builder serving customers in Watermead and the surrounding area. Contact us to today to get a com...
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 £2,416
Need to find an Extension Builder near you for all your extension buildering work?
BA Knott Oxford Ltd provides a local, trusted extension ...
From £2,520
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Watermead it ranges from £2,136 (Bacan's cleaning painting and decorating based in LU1) to £2,544 (Peter's Gutters based in AL5).
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 Watermead by posting a job with HaMuch and we will send it to extension builders in Watermead.
"Install an RSJ" - HP20, job posted 01/01/70
"RSJ installation" - HP21, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Aylesbury | £42 | £270 |
| Install An RSJ near Aylesbury Vale | £36 | £246 |
| Install An RSJ near Leighton Buzzard | £38 | £270 |
| Install An RSJ near Berkhamsted | £41 | £263 |
| Install An RSJ near Chesham | £42 | £277 |
| Install An RSJ near Hazlemere | £40 | £272 |
| Install An RSJ near Dunstable | £41 | £272 |
| Install An RSJ near Bletchley | £39 | £265 |
| Install An RSJ near Wycombe | £39 | £271 |
| Install An RSJ near High Wycombe | £39 | £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 - £17,697

Two storey extension - £88,295

Build a timber frame extension - £26,197

Build a swimming pool - £81,197

Single storey extension - £58,936

Side return extension - £43,714

Install an RSJ - £2,397

Outbuilding - £10,197

Build a Mansard loft conversion - £52,197

Loft conversion - £35,595

Build a kitchen extension - £42,197

Hip to gable loft conversion - £42,197

Granny annexe - £87,197

Garden office - £10,197

Convert a Garage - £16,197

Garage - £18,697

Build a flat roof extension - £22,197

Build a dormer loft conversion - £42,197

Concrete foundations - £6,447

Convert a bungalow loft - £29,197

Convert a basement - £39,714