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Trusted and professional extension builder in KT18. Experienced in all extension buildering work and keeping within budget and on quote. CJC BUILDE...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Trusted and professional extension builder in KT18. Experienced in all extension buildering work and keeping within budget and on quote. DE SELINCO...
From £2,512
Experienced extension builder ready to quote for your work. S JEFFEREY BUILDERS is the best extension builder in KT18. No obligation free quotes an...
From £2,488
SAS Build are here to help customers who need an Extension Builder in KT18. We offer a competitive rate to complete all your extension buildering j...
From £2,072
Nicky King
Over 30 years experience in carpentery. Have carried a a number of extensions and refurbishments in the surrey aera. Have a large number of satisfi...
From £2,080
Experienced extension builder ready to quote for your work. ANM BUILDERS LTD is the best extension builder in KT18. No obligation free quotes and m...
From £1,760
AArron Doyle
Experienced extension builder ready to quote for your work. Priority Roofbuild Ltd is the best extension builder in KT18. No obligation free quotes...
From £3,080
Need an Extension Builder in KT18? London Bespoke Build has been helping local clients (10 mile radius) with their extension buildering jobs for ma...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in KT18 it ranges from £1,760 (Priority Roofbuild Ltd based in KT17) to £3,080 (London Bespoke Build based in KT20).
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 KT18 by posting a job with HaMuch and we will send it to extension builders in KT18.
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 - £17,666

Two storey extension - £88,248

Build a timber frame extension - £26,166

Build a swimming pool - £81,166

Single storey extension - £58,312

Side return extension - £43,363

Install an RSJ - £2,366

Outbuilding - £10,166

Build a Mansard loft conversion - £52,166

Loft conversion - £35,303

Build a kitchen extension - £42,166

Hip to gable loft conversion - £42,166

Granny annexe - £87,166

Garden office - £10,166

Convert a Garage - £16,166

Garage - £18,666

Build a flat roof extension - £22,166

Build a dormer loft conversion - £42,166

Concrete foundations - £6,416

Convert a bungalow loft - £29,166

Convert a basement - £39,363