From £2,280
VIBE CONSTRUCTION LIMITED is an established extension buildering business in CM18. We come highly recommended and provide competitive quotes for yo...
From £2,328
Trusted and professional extension builder in CM18. Experienced in all extension buildering work and keeping within budget and on quote. THE ROMAN ...
From £2,200
Our building services company Added Space Ltd have over fifty years combined experience. We have been helping customers in Harlow and the surroundi...
From £2,040
Urban lofts and extensions ltd is an established extension buildering business in CM18. We come highly recommended and provide competitive quotes f...
From £2,552
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,112
J G BUILDING SERVICES is a trusted extension builder serving customers in CM18 and the surrounding area. Contact us to today to get a competitive q...
From £5,352
We are small building company working for the residential and domestic properties? We work on all types of buildings creating Loft conversion and H...
From £2,368
Welstrong Construction is a team of friends and brothers who enjoy working in the building industry and aim to make sure every customer is fully sa...
From £2,368
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,256
With over 20 years of experience we specialise in fit-outs and maximising your living space. Lofts, extensions, basements, new builds and domestic ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CM18 it ranges from £2,040 (Urban lofts and extensions ltd based in cm20) to £5,352 (Essex loft extensions Ltd based in CM20).
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 CM18 by posting a job with HaMuch and we will send it to extension builders in CM18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Harlow | £43 | £288 |
| Install An RSJ near Hoddesdon | £46 | £296 |
| Install An RSJ near Ware | £47 | £296 |
| Install An RSJ near Epping Forest | £44 | £273 |
| Install An RSJ near Loughton | £44 | £273 |
| Install An RSJ near Cheshunt | £48 | £285 |
| Install An RSJ near Bishop's Stortford | £42 | £264 |
| Install An RSJ near Hertford | £46 | £289 |
| Install An RSJ near East Hertfordshire | £44 | £289 |
| Install An RSJ near Romford | £45 | £276 |
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 - £17,886

Two storey extension - £88,578

Build a timber frame extension - £26,386

Build a swimming pool - £81,386

Single storey extension - £62,712

Side return extension - £45,838

Install an RSJ - £2,586

Outbuilding - £10,386

Build a Mansard loft conversion - £52,386

Loft conversion - £37,365

Build a kitchen extension - £42,386

Hip to gable loft conversion - £42,386

Granny annexe - £87,386

Garden office - £10,386

Convert a Garage - £16,386

Garage - £18,886

Build a flat roof extension - £22,386

Build a dormer loft conversion - £42,386

Concrete foundations - £6,636

Convert a bungalow loft - £29,386

Convert a basement - £41,838