C & B Multi-Trader is an established extension buildering business in RM18. We come highly recommended and provide competitive quotes for your work...
Experienced extension builder ready to quote for your work. CIA Construction Limited is the best extension builder in RM18. No obligation free quot...
Kaizer Berg Ltd is an established and experienced local extension builder in RM18. Please contact us for a free, no obligation quote and competitiv...
From £2,304
Bungar & Co ltd is a trusted extension builder serving customers in RM18 and the surrounding area. Contact us to today to get a competitive quote f...
From £2,296
Essex, RM18
Experienced extension builder ready to quote for your work. Deen Construction & Renovations Ltd is the best extension builder in RM18. No obligatio...
From £2,168
At Deen Construction & Renovations Ltd, we offer a one stop solution for a range of property Constructions & Renovation projects, Maintenance, Full...
From £2,296
Beautiful Kitchens is a family-run company, owned and directed by husband and wife Debbie and Nigel Powell along with their daughter, Bethany, and ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in RM18 it ranges from £2,080 (CIA Construction Limited based in RM18) to £2,576 (C & B Multi-Trader based in RM16).
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 RM18 by posting a job with HaMuch and we will send it to extension builders in RM18.
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 - £17,570

Two storey extension - £88,105

Build a timber frame extension - £26,070

Build a swimming pool - £81,070

Single storey extension - £56,394

Side return extension - £42,284

Install an RSJ - £2,270

Outbuilding - £10,070

Build a Mansard loft conversion - £52,070

Loft conversion - £34,404

Build a kitchen extension - £42,070

Hip to gable loft conversion - £42,070

Granny annexe - £87,070

Garden office - £10,070

Convert a Garage - £16,070

Garage - £18,570

Build a flat roof extension - £22,070

Build a dormer loft conversion - £42,070

Concrete foundations - £6,320

Convert a bungalow loft - £29,070

Convert a basement - £38,284