From £2,648
We pride ourselves on providing a professional, caring, and high-quality service and always meet our customers’ needs. Each contractor that works...
From £2,216
WiseContract are here to help customers who need an Extension Builder in New Cross. We offer a competitive rate to complete all your extension buil...
From £2,488
Trusted and professional extension builder in New Cross. Experienced in all extension buildering work and keeping within budget and on quote. Basel...
From £2,512
Need to find an Extension Builder near you for all your extension buildering work?
blitbolt ltd provides a local, trusted extension builder...
From £2,400
We have a creative eye and like a challenge, often building bespoke and creative buildings and furniture. This is mixed with a wide experience of m...
From £2,576
Need an Extension Builder in New Cross? Exquisite Design & Build Ltd has been helping local clients (5 mile radius) with their extension buildering...
From £2,296
Ballara Ltd is an established and experienced local extension builder in New Cross. Please contact us for a free, no obligation quote and competiti...
From £2,240
Ballara Limited was set up by Darryl Pitt in 2008, however, Darryl has been involved in the building industry for over 20 years. He started out a...
From £2,320
Global Business BoxLttd are here to help customers who need an Extension Builder in New Cross. We offer a competitive rate to complete all your ext...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in New Cross it ranges from £2,216 (WiseContract based in se14) to £2,648 (DWL Construction Ltd based in SE14).
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 New Cross by posting a job with HaMuch and we will send it to extension builders in New Cross.
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 - £17,694

Two storey extension - £88,290

Build a timber frame extension - £26,194

Build a swimming pool - £81,194

Single storey extension - £58,872

Side return extension - £43,678

Install an RSJ - £2,394

Outbuilding - £10,194

Build a Mansard loft conversion - £52,194

Loft conversion - £35,565

Build a kitchen extension - £42,194

Hip to gable loft conversion - £42,194

Granny annexe - £87,194

Garden office - £10,194

Convert a Garage - £16,194

Garage - £18,694

Build a flat roof extension - £22,194

Build a dormer loft conversion - £42,194

Concrete foundations - £6,444

Convert a bungalow loft - £29,194

Convert a basement - £39,678