Russell Channnon
At Templar Developments we work with our clients from thought to finish all the while keeping quality 110%. We cover all your construction needs on...
Need to find an Extension Builder near you for all your extension buildering work?
Gem Construction (Sussex) Ltd provides a local, trusted ...
Technique Roofing and Maintenance are here to help customers who need an Extension Builder in BN20. We offer a competitive rate to complete all you...
Experienced extension builder ready to quote for your work. CG Renovations Ltd is the best extension builder in BN20. No obligation free quotes and...
Need to find an Extension Builder near you for all your extension buildering work?
Heymann Builders Ltd provides a local, trusted extension...
ATLAS BUILDING AND MAINT are here to help customers who need an Extension Builder in BN20. We offer a competitive rate to complete all your extensi...
From £1,680
Krzysztof Jankowski
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,016
Experienced extension builder ready to quote for your work. Razvan Building Services Ltd is the best extension builder in BN20. No obligation free ...
From £2,448
GREEN ROOM CONSTRUCTION is an established and experienced local extension builder in BN20. Please contact us for a free, no obligation quote and co...
From £2,008
Richard Dinnage
Need to find an Extension Builder near you for all your extension buildering work?
DINNAGE BUILDERS provides a local, trusted extension bui...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BN20 it ranges from £1,680 (Pro For You based in BN22) to £2,448 (GREEN ROOM CONSTRUCTION based in BN22).
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 BN20 by posting a job with HaMuch and we will send it to extension builders in BN20.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Eastbourne | £32 | £245 |
| Install An RSJ near Seaford | £34 | £243 |
| Install An RSJ near Hailsham | £31 | £243 |
| Install An RSJ near Bexhill-on-Sea | £31 | £243 |
| Install An RSJ near Wealden | £35 | £256 |
| Install An RSJ near Hastings | £31 | £246 |
| Install An RSJ near Brighton and Hove | £35 | £251 |
| Install An RSJ near Brighton | £35 | £251 |
| Install An RSJ near Crowborough | £36 | £258 |
| Install An RSJ near Burgess Hill | £36 | £240 |
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 - £17,433

Two storey extension - £87,899

Build a timber frame extension - £25,933

Build a swimming pool - £80,933

Single storey extension - £53,656

Side return extension - £40,744

Install an RSJ - £2,133

Outbuilding - £9,933

Build a Mansard loft conversion - £51,933

Loft conversion - £33,120

Build a kitchen extension - £41,933

Hip to gable loft conversion - £41,933

Granny annexe - £86,933

Garden office - £9,933

Convert a Garage - £15,933

Garage - £18,433

Build a flat roof extension - £21,933

Build a dormer loft conversion - £41,933

Concrete foundations - £6,183

Convert a bungalow loft - £28,933

Convert a basement - £36,744