From £2,080
Experienced extension builder ready to quote for your work. CIA Construction Limited is the best extension builder in CM15. No obligation free quot...
From £2,264
Hyde Building Ltd are here to help customers who need an Extension Builder in CM15. We offer a competitive rate to complete all your extension buil...
From £2,560
Need an Extension Builder in CM15? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension buildering j...
1 review
From £2,392
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
From £2,224
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £2,208
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
From £2,512
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in CM15. Please contact us for a free, no obliga...
From £2,384
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in CM15. No obligation free quotes and ...
From £2,384
Relax... you have found a reliable extension builder in CM15. First guard Roofing is a friendly and reliable company based in CM15 who consider no ...
From £2,816
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in CM15 and the surrounding area. Contact us to today to get a com...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CM15 it ranges from £2,080 (CIA Construction Limited based in RM18) to £2,816 (HOUSE BUILDING SERVICES LIMITED based in DA16).
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 CM15 by posting a job with HaMuch and we will send it to extension builders in CM15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Brentwood | £39 | £255 |
| Install An RSJ near Billericay | £38 | £248 |
| Install An RSJ near Romford | £45 | £274 |
| Install An RSJ near Basildon | £39 | £251 |
| Install An RSJ near South Ockendon | £58 | £276 |
| Install An RSJ near Chelmsford | £38 | £258 |
| Install An RSJ near Wickford | £39 | £255 |
| Install An RSJ near Stanford-le-Hope | £40 | £254 |
| Install An RSJ near Loughton | £44 | £273 |
| 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 - £17,682

Two storey extension - £88,274

Build a timber frame extension - £26,182

Build a swimming pool - £81,182

Single storey extension - £58,648

Side return extension - £43,552

Install an RSJ - £2,382

Outbuilding - £10,182

Build a Mansard loft conversion - £52,182

Loft conversion - £35,460

Build a kitchen extension - £42,182

Hip to gable loft conversion - £42,182

Granny annexe - £87,182

Garden office - £10,182

Convert a Garage - £16,182

Garage - £18,682

Build a flat roof extension - £22,182

Build a dormer loft conversion - £42,182

Concrete foundations - £6,432

Convert a bungalow loft - £29,182

Convert a basement - £39,552