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 Southminster and the surrounding area. Contact us to today to...
From £1,656
Experienced extension builder ready to quote for your work. Capital Roofing Ltd is the best extension builder in Southminster. No obligation free q...
From £2,360
Property Maintenance are here to help customers who need an Extension Builder in Southminster. We offer a competitive rate to complete all your ext...
From £2,560
Need an Extension Builder in Southminster? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension buil...
From £1,880
Trusted and professional extension builder in Southminster. Experienced in all extension buildering work and keeping within budget and on quote. CH...
From £2,208
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
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...
From £2,096
Relax... you have found a reliable extension builder in Southminster. Mikra Services is a friendly and reliable company based in Southminster who c...
From £1,920
Need an Extension Builder in Southminster? S & A Building & Landscapes Service has been helping local clients (20 mile radius) with their extension...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Southminster it ranges from £1,656 (Capital Roofing Ltd based in SS13) 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 Southminster by posting a job with HaMuch and we will send it to extension builders in Southminster.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Maldon | £36 | £244 |
| Install An RSJ near Southend-on-Sea | £37 | £247 |
| Install An RSJ near Rayleigh | £39 | £252 |
| Install An RSJ near Thundersley | £38 | £251 |
| Install An RSJ near Witham | £36 | £240 |
| Install An RSJ near Wickford | £39 | £255 |
| Install An RSJ near Canvey Island | £39 | £256 |
| Install An RSJ near Basildon | £39 | £251 |
| Install An RSJ near Colchester | £34 | £232 |
| Install An RSJ near Clacton-on-Sea | £31 | £230 |
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 - £17,442

Two storey extension - £87,912

Build a timber frame extension - £25,942

Build a swimming pool - £80,942

Single storey extension - £53,832

Side return extension - £40,843

Install an RSJ - £2,142

Outbuilding - £9,942

Build a Mansard loft conversion - £51,942

Loft conversion - £33,203

Build a kitchen extension - £41,942

Hip to gable loft conversion - £41,942

Granny annexe - £86,942

Garden office - £9,942

Convert a Garage - £15,942

Garage - £18,442

Build a flat roof extension - £21,942

Build a dormer loft conversion - £41,942

Concrete foundations - £6,192

Convert a bungalow loft - £28,942

Convert a basement - £36,843