Witton & Pearce Builders in Essex is a trusted extension builder serving customers in CM11 and the surrounding area. Contact us to today to get a c...
Billy Baverstock
Experienced extension builder ready to quote for your work. Capital Roofing Ltd is the best extension builder in CM11. No obligation free quotes an...
Property Maintenance are here to help customers who need an Extension Builder in CM11. We offer a competitive rate to complete all your extension b...
Need to find an Extension Builder near you for all your extension buildering work?
RV BUILDING & MAINTENANCE provides a local, trusted exte...
Need an Extension Builder in CM11? DG Construction Essex Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...
Billericay Loft Conversions is a trusted extension builder serving customers in CM11 and the surrounding area. Contact us to today to get a competi...
Concept Interiors Management Ltd is a trusted extension builder serving customers in CM11 and the surrounding area. Contact us to today to get a co...
From £2,408
Browns Contractors is a trusted extension builder serving customers in CM11 and the surrounding area. Contact us to today to get a competitive quot...
From £2,136
Dean Jeffrey
Need to find an Extension Builder near you for all your extension buildering work?
D J J BRICKWORK LIMITED provides a local, trusted extens...
From £1,976
Rimantas Seskus
Rimantas is an established extension buildering business in CM11. We come highly recommended and provide competitive quotes for your work.

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CM11 it ranges from £1,656 (Capital Roofing Ltd based in SS13) to £2,464 (Billericay Loft Conversions based in CM11).
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 CM11 by posting a job with HaMuch and we will send it to extension builders in CM11.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Billericay | £38 | £248 |
| Install An RSJ near Basildon | £39 | £251 |
| Install An RSJ near Wickford | £39 | £255 |
| Install An RSJ near Brentwood | £39 | £255 |
| Install An RSJ near Stanford-le-Hope | £40 | £254 |
| Install An RSJ near Rayleigh | £39 | £252 |
| Install An RSJ near Thundersley | £38 | £251 |
| Install An RSJ near Chelmsford | £38 | £258 |
| Install An RSJ near Canvey Island | £39 | £256 |
| 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 - £17,472

Two storey extension - £87,958

Build a timber frame extension - £25,972

Build a swimming pool - £80,972

Single storey extension - £54,440

Side return extension - £41,185

Install an RSJ - £2,172

Outbuilding - £9,972

Build a Mansard loft conversion - £51,972

Loft conversion - £33,488

Build a kitchen extension - £41,972

Hip to gable loft conversion - £41,972

Granny annexe - £86,972

Garden office - £9,972

Convert a Garage - £15,972

Garage - £18,472

Build a flat roof extension - £21,972

Build a dormer loft conversion - £41,972

Concrete foundations - £6,222

Convert a bungalow loft - £28,972

Convert a basement - £37,185