From £2,512
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in SS13. Please contact us for a free, no obliga...
From £2,816
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in SS13 and the surrounding area. Contact us to today to get a com...
From £2,080
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,512
skilled worker who specializes in completing a wide range of building and renovation projects
From £2,440
M&J Brickwork Ltd are a Chelmsford based Bricklaying & General Building company that operate throughout the Essex and South London...
From £2,400
Relax... you have found a reliable extension builder in SS13. Derryard Construction Ltd is a friendly and reliable company based in SS13 who consid...
From £2,168
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in SS13. We offer a competitive rate to complete all your extension bu...
From £2,232
Relax... you have found a reliable extension builder in SS13. Major Building Contractors Ltd is a friendly and reliable company based in SS13 who c...
From £2,384
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
From £2,912
Experienced extension builder ready to quote for your work. Render is the best extension builder in SS13. No obligation free quotes and many happy ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SS13 it ranges from £2,080 (Can design and Construction based in Ig11) to £2,912 (Render based in IG1).
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 SS13 by posting a job with HaMuch and we will send it to extension builders in SS13.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Basildon | £39 | £251 |
| Install An RSJ near Wickford | £39 | £255 |
| Install An RSJ near Thundersley | £38 | £251 |
| Install An RSJ near Rayleigh | £39 | £252 |
| Install An RSJ near Billericay | £38 | £248 |
| Install An RSJ near Stanford-le-Hope | £40 | £254 |
| Install An RSJ near Canvey Island | £39 | £256 |
| Install An RSJ near Brentwood | £39 | £255 |
| Install An RSJ near Southend-on-Sea | £37 | £247 |
| Install An RSJ near Thurrock | £41 | £260 |
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 - £17,746

Two storey extension - £88,368

Build a timber frame extension - £26,246

Build a swimming pool - £81,246

Single storey extension - £59,912

Side return extension - £44,263

Install an RSJ - £2,446

Outbuilding - £10,246

Build a Mansard loft conversion - £52,246

Loft conversion - £36,053

Build a kitchen extension - £42,246

Hip to gable loft conversion - £42,246

Granny annexe - £87,246

Garden office - £10,246

Convert a Garage - £16,246

Garage - £18,746

Build a flat roof extension - £22,246

Build a dormer loft conversion - £42,246

Concrete foundations - £6,496

Convert a bungalow loft - £29,246

Convert a basement - £40,263