From £2,376
Trusted and professional extension builder in BN25. Experienced in all extension buildering work and keeping within budget and on quote. J L BUILDI...
From £2,488
Oliver Relton
Here at Complete Property Solutions, we have a small dedicated team of professional, conscientious tradesman with the knowledge and experience to e...
From £2,008
The Place Between offers home design and project management services. We work with a network of building professionals. We believe that the transit...
From £2,264
At Prestige we pride ourselves on delivering bespoke projects including Heritage and specialist works.

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BN25 it ranges from £2,008 (The Place Between based in BN25) to £2,488 (Complete Property Solutions (Sussex) Limited based in BN9).
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 BN25 by posting a job with HaMuch and we will send it to extension builders in BN25.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Seaford | £34 | £243 |
| Install An RSJ near Eastbourne | £32 | £245 |
| Install An RSJ near Hailsham | £31 | £243 |
| Install An RSJ near Brighton and Hove | £35 | £251 |
| Install An RSJ near Brighton | £35 | £251 |
| Install An RSJ near Wealden | £35 | £256 |
| Install An RSJ near Burgess Hill | £36 | £240 |
| Install An RSJ near Shoreham-by-Sea | £36 | £250 |
| Install An RSJ near Bexhill-on-Sea | £31 | £243 |
| Install An RSJ near Haywards Heath | £35 | £256 |
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 - £17,584

Two storey extension - £88,126

Build a timber frame extension - £26,084

Build a swimming pool - £81,084

Single storey extension - £56,680

Side return extension - £42,445

Install an RSJ - £2,284

Outbuilding - £10,084

Build a Mansard loft conversion - £52,084

Loft conversion - £34,538

Build a kitchen extension - £42,084

Hip to gable loft conversion - £42,084

Granny annexe - £87,084

Garden office - £10,084

Convert a Garage - £16,084

Garage - £18,584

Build a flat roof extension - £22,084

Build a dormer loft conversion - £42,084

Concrete foundations - £6,334

Convert a bungalow loft - £29,084

Convert a basement - £38,445