From £2,208
Need to find an Extension Builder near you for all your extension buildering work?
Tj's Fencing provides a local, trusted extension builder...
From £2,008
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,136
Extensions, Refurbishments & Loft ConversionsAt Keystone our mission is to help our clients imagine, design & build environments that enhance their...
From £2,312
Experienced extension builder ready to quote for your work. MRA CONSTRUCTION is the best extension builder in Mid Sussex. No obligation free quotes...
From £2,800
Rjscarpentryconstruction is a well established company with over 30 years of experience in the carpentry and construction industries
From £2,048
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,488
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...
From £2,056
HEVIN BUILDERS is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quotes for your wo...
From £2,560
TOLLEY CARPENTRY is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quotes for your ...
From £2,264
JG Brickwork Services Limited is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Mid Sussex it ranges from £1,488 (JUST ONE BUILDING SERVICES based in RH11) to £2,800 (RJ's Carpentry Construction based in RH15).
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 Mid Sussex by posting a job with HaMuch and we will send it to extension builders in Mid Sussex.
"RSJ installation" - HAYWARDS HEATH, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Mid Sussex | £35 | £261 |
| Install An RSJ near Haywards Heath | £35 | £256 |
| Install An RSJ near Burgess Hill | £36 | £240 |
| Install An RSJ near Crawley | £38 | £255 |
| Install An RSJ near East Grinstead | £37 | £259 |
| Install An RSJ near Horsham | £38 | £265 |
| Install An RSJ near Horley | £38 | £258 |
| Install An RSJ near Crowborough | £36 | £258 |
| Install An RSJ near Brighton and Hove | £35 | £251 |
| Install An RSJ near Redhill | £41 | £269 |
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 - £17,488

Two storey extension - £87,982

Build a timber frame extension - £25,988

Build a swimming pool - £80,988

Single storey extension - £54,760

Side return extension - £41,365

Install an RSJ - £2,188

Outbuilding - £9,988

Build a Mansard loft conversion - £51,988

Loft conversion - £33,638

Build a kitchen extension - £41,988

Hip to gable loft conversion - £41,988

Granny annexe - £86,988

Garden office - £9,988

Convert a Garage - £15,988

Garage - £18,488

Build a flat roof extension - £21,988

Build a dormer loft conversion - £41,988

Concrete foundations - £6,238

Convert a bungalow loft - £28,988

Convert a basement - £37,365