David Oreilly
We are a family run business we 40 years experience delivering multiple projects from new developments . Extension. Loft conversion. Including foun...
Crawley Construction Ltd
Contact us: 07454160840 Email: enquiries@ We are a family run business since 15 year’s+. We are build on tru...
DC Construction is a trusted extension builder serving customers in RH10 and the surrounding area. Contact us to today to get a competitive quote f...
J S Nisbet Loft Conversions are here to help customers who need an Extension Builder in RH10. We offer a competitive rate to complete all your exte...
From £2,048
Need to find an Extension Builder near you for all your extension buildering work?
WATTSON BROS BUILDING LTD provides a local, trusted exte...
Rob Howitt
I have been in the building trade for over 20 years and run my own business for the last 10 years. I am very reliable and have plenty of experience...
"DO NOT USE. R cant calculate and has told me to order more than i should have several times. Also cannot lay floors. Did awful job of mine. Wish i had not renewed it and not paid before checked the job. Email me for photos. Only good thing is he turned up when said he would although took months to..." - CRAWLEY,reviewed 01/05/18, FRAN
From £2,232
Denis Copland
LONGSTONE CONSTRUCTION LTD are here to help customers who need an Extension Builder in RH10. We offer a competitive rate to complete all your exten...
From £2,208
Home Counties Landscapes are here to help customers who need an Extension Builder in RH10. We offer a competitive rate to complete all your extensi...
From £1,528
Tony Gallagher
E.P.A. (UK) LTD is an established and experienced local extension builder in RH10. Please contact us for a free, no obligation quote and competitiv...
From £2,392
Relax... you have found a reliable extension builder in RH10. Stephen Building & Refurbishments is a friendly and reliable company based in RH10 wh...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in RH10 it ranges from £1,488 (JUST ONE BUILDING SERVICES based in RH11) to £2,392 (Stephen Building & Refurbishments based in RH6).
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 RH10 by posting a job with HaMuch and we will send it to extension builders in RH10.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Crawley | £38 | £255 |
| Install An RSJ near Horley | £38 | £258 |
| Install An RSJ near Mid Sussex | £35 | £261 |
| Install An RSJ near East Grinstead | £37 | £259 |
| Install An RSJ near Horsham | £38 | £265 |
| Install An RSJ near Haywards Heath | £35 | £256 |
| Install An RSJ near Redhill | £41 | £269 |
| Install An RSJ near Reigate | £40 | £270 |
| Install An RSJ near Burgess Hill | £36 | £240 |
| Install An RSJ near Reigate & Banstead | £41 | £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 - £17,354

Two storey extension - £87,780

Build a timber frame extension - £25,854

Build a swimming pool - £80,854

Single storey extension - £52,072

Side return extension - £39,853

Install an RSJ - £2,054

Outbuilding - £9,854

Build a Mansard loft conversion - £51,854

Loft conversion - £32,378

Build a kitchen extension - £41,854

Hip to gable loft conversion - £41,854

Granny annexe - £86,854

Garden office - £9,854

Convert a Garage - £15,854

Garage - £18,354

Build a flat roof extension - £21,854

Build a dormer loft conversion - £41,854

Concrete foundations - £6,104

Convert a bungalow loft - £28,854

Convert a basement - £35,853