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Need to find an Extension Builder near you for all your extension buildering work?
OAK HOUSE BESPOKE BUILDERS provides a local, trusted ext...
Andy Harris
Andy Harris Construction is an established and experienced local extension builder in Sunbury-on-thames. Please contact us for a free, no obligatio...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Jatinder Kahlon
Hi, I’m Jatinder. I’m a qualified electrician and gas safe registered professional with 10 years of experience in the trade. We specialise in l...
Need to find an Extension Builder near you for all your extension buildering work?
Slick Construction Ltd provides a local, trusted extensi...
From 2007 – 2015 David Rudelhoff (Founder and Director) was the Property Manager for a high profile, high net worth family. During that time, in ...
Lead by designer Richard Gordon, GDC is a London and Berkshire based Design & Build firm with a vast amount of experience in both the residential a...
Trusted and professional extension builder in Sunbury-on-thames. Experienced in all extension buildering work and keeping within budget and on quot...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Image Design & Consultants is a trusted extension builder serving customers in Sunbury-on-thames and the surrounding area. Contact us to today to g...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Sunbury-on-thames it ranges from £2,352 (Hawaii Ltd based in TW3) to £3,000 (OAK HOUSE BESPOKE BUILDERS based in KT9).
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 Sunbury-on-thames by posting a job with HaMuch and we will send it to extension builders in Sunbury-on-thames.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Sunbury-on-Thames | £43 | £273 |
| Install An RSJ near West Molesey | £43 | £274 |
| Install An RSJ near Walton-on-Thames | £43 | £277 |
| Install An RSJ near Elmbridge | £44 | £278 |
| Install An RSJ near Richmond Upon Thames | £43 | £274 |
| Install An RSJ near Esher | £43 | £274 |
| Install An RSJ near Hounslow | £43 | £272 |
| Install An RSJ near Staines-upon-Thames | £42 | £269 |
| Install An RSJ near New Haw | £43 | £273 |
| Install An RSJ near Kingston Upon Thames | £43 | £271 |
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 - £17,873

Two storey extension - £88,559

Build a timber frame extension - £26,373

Build a swimming pool - £81,373

Single storey extension - £62,456

Side return extension - £45,694

Install an RSJ - £2,573

Outbuilding - £10,373

Build a Mansard loft conversion - £52,373

Loft conversion - £37,245

Build a kitchen extension - £42,373

Hip to gable loft conversion - £42,373

Granny annexe - £87,373

Garden office - £10,373

Convert a Garage - £16,373

Garage - £18,873

Build a flat roof extension - £22,373

Build a dormer loft conversion - £42,373

Concrete foundations - £6,623

Convert a bungalow loft - £29,373

Convert a basement - £41,694