From £2,056
CAMBRIDGE BUILDING SERVICES is a trusted extension builder serving customers in BN3 and the surrounding area. Contact us to today to get a competit...
From £2,104
Fenice Design + Build is an established and experienced local extension builder in BN3. Please contact us for a free, no obligation quote and compe...
From £2,496
Proper Copper DesignWe are a design lead copper homeware company specializing in contemporary handles, taps, showers and accessories. Our products ...
From £1,928
East building projects is an established extension buildering business in BN3. We come highly recommended and provide competitive quotes for your w...
From £2,080
KEN BUILDING is an established extension buildering business in BN3. We come highly recommended and provide competitive quotes for your work.
From £2,520
We are truly a 1 stop shop for any internal and external trade works. Using all
of our own guys we offer anything from small repairs to ...
From £2,224
Need to find an Extension Builder near you for all your extension buildering work?
Openshaw Living provides a local, trusted extension buil...
From £1,968
Experienced extension builder ready to quote for your work. Graeme Davies Plumbing and Heating is the best extension builder in BN3. No obligation ...
From £1,904
Experienced extension builder ready to quote for your work. Moon Tree is the best extension builder in BN3. No obligation free quotes and many happ...
From £2,296
Experienced extension builder ready to quote for your work. Pataross Projects is the best extension builder in BN3. No obligation free quotes and m...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BN3 it ranges from £1,904 (Moon Tree based in BN3) to £2,520 (Reactive Property Services Ltd based in BN3).
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 BN3 by posting a job with HaMuch and we will send it to extension builders in BN3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Brighton | £35 | £251 |
| Install An RSJ near Brighton and Hove | £35 | £251 |
| Install An RSJ near Shoreham-by-Sea | £36 | £250 |
| Install An RSJ near Lancing | £37 | £251 |
| Install An RSJ near Burgess Hill | £36 | £240 |
| Install An RSJ near Worthing | £35 | £251 |
| Install An RSJ near Haywards Heath | £35 | £256 |
| Install An RSJ near Seaford | £34 | £243 |
| Install An RSJ near Rustington | £36 | £246 |
| Install An RSJ near Mid Sussex | £35 | £261 |
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 - £17,458

Two storey extension - £87,936

Build a timber frame extension - £25,958

Build a swimming pool - £80,958

Single storey extension - £54,152

Side return extension - £41,023

Install an RSJ - £2,158

Outbuilding - £9,958

Build a Mansard loft conversion - £51,958

Loft conversion - £33,353

Build a kitchen extension - £41,958

Hip to gable loft conversion - £41,958

Granny annexe - £86,958

Garden office - £9,958

Convert a Garage - £15,958

Garage - £18,458

Build a flat roof extension - £21,958

Build a dormer loft conversion - £41,958

Concrete foundations - £6,208

Convert a bungalow loft - £28,958

Convert a basement - £37,023