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Aaron Hale
We are a family run buisness with over 20 years experience. We undertake all aspects of building, carpentry and maintenance work including:
"Great team" - BRIGHTON,reviewed 07/08/17, STEVE
Relax... you have found a reliable extension builder in Seaford. R N CONSTRUCTIONS is a friendly and reliable company based in Seaford who consider...
RWL BUILDING SERVICES is an established and experienced local extension builder in Seaford. Please contact us for a free, no obligation quote and c...
From £1,936
Need an Extension Builder in Seaford? M J C BUILDING SERVICES has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £1,752
Kris Barker
We are a family run business, with a combined 60 plus years of carpentry and joinery experience. We cover the whole of sussex. We work to a extreme...
From £2,376
Seaford, BN25
Trusted and professional extension builder in Seaford. Experienced in all extension buildering work and keeping within budget and on quote. J L BUI...
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
Richard Dinnage
Need to find an Extension Builder near you for all your extension buildering work?
DINNAGE BUILDERS provides a local, trusted extension bui...
From £1,960
Experienced extension builder ready to quote for your work. M Hone Brickwork is the best extension builder in Seaford. No obligation free quotes an...
From £1,888
Pete Littlejohn
Family run builders with high standards of workmanship and customer service, trading standards approved.

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Seaford it ranges from £1,752 (Barker & sons based in BN10) 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 Seaford by posting a job with HaMuch and we will send it to extension builders in Seaford.
| 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 | £252 |
| Install An RSJ near Brighton | £35 | £253 |
| Install An RSJ near Wealden | £35 | £256 |
| Install An RSJ near Burgess Hill | £36 | £256 |
| 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 - £17,372

Two storey extension - £87,808

Build a timber frame extension - £25,872

Build a swimming pool - £80,872

Single storey extension - £52,440

Side return extension - £40,060

Install an RSJ - £2,072

Outbuilding - £9,872

Build a Mansard loft conversion - £51,872

Loft conversion - £32,550

Build a kitchen extension - £41,872

Hip to gable loft conversion - £41,872

Granny annexe - £86,872

Garden office - £9,872

Convert a Garage - £15,872

Garage - £18,372

Build a flat roof extension - £21,872

Build a dormer loft conversion - £41,872

Concrete foundations - £6,122

Convert a bungalow loft - £28,872

Convert a basement - £36,060