Erald Kanani
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Torrington Design
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
Ali Alagoz
Propello is an established and experienced local extension builder in CM18. Please contact us for a free, no obligation quote and competitive rate...
Rafal Szczepanski
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Sampson Essien
Thistle Bonding Coat: Ideal for use on low-suction backgrounds such as brick or concrete blocks, this product provided a solid foundation, Thi...
Jay Reid
Samuele Paolini
Need an Extension Builder in CM18? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CM18 it ranges from £2,080 (Can design and Construction based in Ig11) to £4,520 (Reid and Co Developments Ltd based in NW8).
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 | £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 - £18,065

Two storey extension - £88,847

Build a timber frame extension - £26,565

Build a swimming pool - £81,565

Single storey extension - £66,296

Side return extension - £47,854

Install an RSJ - £2,765

Outbuilding - £10,565

Build a Mansard loft conversion - £52,565

Loft conversion - £39,045

Build a kitchen extension - £42,565

Hip to gable loft conversion - £42,565

Granny annexe - £87,565

Garden office - £10,565

Convert a Garage - £16,565

Garage - £19,065

Build a flat roof extension - £22,565

Build a dormer loft conversion - £42,565

Concrete foundations - £6,815

Convert a bungalow loft - £29,565

Convert a basement - £43,854