From £2,080
Experienced extension builder ready to quote for your work. CIA Construction Limited is the best extension builder in SS1. No obligation free quote...
From £2,560
Need an Extension Builder in SS1? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension buildering jo...
From £2,208
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
From £2,440
M&J Brickwork Ltd are a Chelmsford based Bricklaying & General Building company that operate throughout the Essex and South London...
From £2,376
Witton & Pearce Builders in Essex is a trusted extension builder serving customers in SS1 and the surrounding area. Contact us to today to get a co...
From £1,656
Experienced extension builder ready to quote for your work. Capital Roofing Ltd is the best extension builder in SS1. No obligation free quotes and...
From £2,472
P OUGHTON BUILDING is an established and experienced local extension builder in SS1. Please contact us for a free, no obligation quote and competit...
From £2,360
Property Maintenance are here to help customers who need an Extension Builder in SS1. We offer a competitive rate to complete all your extension bu...
From £1,256
35 years in the trade can Lay bricks plaster roofing wall and floor tiling
From £1,920
Need to find an Extension Builder near you for all your extension buildering work?
JLS Building Services provides a local, trusted extensio...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SS1 it ranges from £1,256 (S MEGSON CONSTRUCTION based in CT5) to £2,560 (Ellis & James Builders Limited based in SS17).
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 SS1 by posting a job with HaMuch and we will send it to extension builders in SS1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Southend-on-Sea | £37 | £247 |
| Install An RSJ near Canvey Island | £39 | £256 |
| Install An RSJ near Thundersley | £38 | £251 |
| Install An RSJ near Rayleigh | £39 | £252 |
| Install An RSJ near Wickford | £39 | £255 |
| Install An RSJ near Basildon | £39 | £251 |
| Install An RSJ near Stanford-le-Hope | £40 | £254 |
| Install An RSJ near Gillingham | £39 | £253 |
| Install An RSJ near Sittingbourne | £35 | £246 |
| Install An RSJ near Billericay | £38 | £248 |
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