From £2,248
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in CR9. No obligation free quotes ...
From £2,624
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,512
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in CR9. Please contact us for a free, no obligat...
From £2,592
Need an Extension Builder in CR9? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £2,120
NISUP BUILDING SERVICES Company specializes in the domestic and commercial building industry :1. Refurbishm...
From £2,632
Krystian Wojasiewicz is a trusted extension builder serving customers in CR9 and the surrounding area. Contact us to today to get a competitive quo...
From £2,632
Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...
From £2,344
Experienced extension builder ready to quote for your work. Khetani Builders (UK) Ltd is the best extension builder in CR9. No obligation free quot...
From £2,504
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
From £2,104
V.S.P is a trusted extension builder serving customers in CR9 and the surrounding area. Contact us to today to get a competitive quote for extensio...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CR9 it ranges from £2,104 (V.S.P based in NW10) to £2,632 (Krystian Wojasiewicz based in HA9).
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 CR9 by posting a job with HaMuch and we will send it to extension builders in CR9.
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 - £17,731

Two storey extension - £88,347

Build a timber frame extension - £26,231

Build a swimming pool - £81,231

Single storey extension - £59,624

Side return extension - £44,101

Install an RSJ - £2,431

Outbuilding - £10,231

Build a Mansard loft conversion - £52,231

Loft conversion - £35,918

Build a kitchen extension - £42,231

Hip to gable loft conversion - £42,231

Granny annexe - £87,231

Garden office - £10,231

Convert a Garage - £16,231

Garage - £18,731

Build a flat roof extension - £22,231

Build a dormer loft conversion - £42,231

Concrete foundations - £6,481

Convert a bungalow loft - £29,231

Convert a basement - £40,101