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Jon Howard Construction Ltd is a trusted extension builder serving customers in Harlow and the surrounding area. Contact us to today to get a compe...
Colin
Harlow, CM20
We are small building company working for the residential and domestic properties? We work on all types of buildings creating Loft conversion and H...
D C Salsbury Builders is an established and experienced local extension builder in Harlow. Please contact us for a free, no obligation quote and co...
Experienced extension builder ready to quote for your work. All Roofing & Guttering is the best extension builder in Harlow. No obligation free quo...
J G BUILDING SERVICES is a trusted extension builder serving customers in Harlow and the surrounding area. Contact us to today to get a competitive...
Dan Nevill
Nevill Design & Build specialises in high-quality house extensions, loft conversions, structural alterations, and full refurbishments. We’ve deli...
From £2,624
Hopson Bros Services is a trusted extension builder serving customers in Harlow and the surrounding area. Contact us to today to get a competitive ...
From £2,424
Experienced extension builder ready to quote for your work. Groome & Sons Ltd is the best extension builder in Harlow. No obligation free quotes an...
From £2,584
D E BRACKEN BUILDING SERVICES is an established and experienced local extension builder in Harlow. Please contact us for a free, no obligation quot...
From £2,368
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Harlow it ranges from £2,112 (J G BUILDING SERVICES based in CM19) 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 Harlow by posting a job with HaMuch and we will send it to extension builders in Harlow.
| 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 Bishop's Stortford | £42 | £264 |
| Install An RSJ near Ware | £47 | £296 |
| Install An RSJ near Epping Forest | £44 | £274 |
| Install An RSJ near Loughton | £44 | £273 |
| Install An RSJ near Cheshunt | £48 | £285 |
| Install An RSJ near Hertford | £46 | £290 |
| Install An RSJ near East Hertfordshire | £44 | £289 |
| Install An RSJ near Romford | £45 | £274 |
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 - £18,008

Two storey extension - £88,762

Build a timber frame extension - £26,508

Build a swimming pool - £81,508

Single storey extension - £65,160

Side return extension - £47,215

Install an RSJ - £2,708

Outbuilding - £10,508

Build a Mansard loft conversion - £52,508

Loft conversion - £38,513

Build a kitchen extension - £42,508

Hip to gable loft conversion - £42,508

Granny annexe - £87,508

Garden office - £10,508

Convert a Garage - £16,508

Garage - £19,008

Build a flat roof extension - £22,508

Build a dormer loft conversion - £42,508

Concrete foundations - £6,758

Convert a bungalow loft - £29,508

Convert a basement - £43,215