From £2,496
Cricklewood, NW2
Need to find an Extension Builder near you for all your extension buildering work?
BELLVIEW BUILDERS LTD provides a local, trusted extensio...
From £2,560
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,512
London, NW2
Our building services company AA Plus Renovation Ltd has over 13 years of experience. Since then, we have been helping customers in London and the ...
From £2,176
Need to find an Extension Builder near you for all your extension buildering work?
Ivy Project Management provides a local, trusted extensi...
From £2,552
London, NW2
When faced with difficulties and disorganisation with her own home build, Ivana realised that there were so many unnecessary stresses and delays in...
From £2,544
Pineapple Engineering Ltd. are here to help customers who need an Extension Builder in NW2. We offer a competitive rate to complete all your extens...
From £2,128
Cricklewood, NW2
Experienced extension builder ready to quote for your work. Bros Construction Ltd is the best extension builder in NW2. No obligation free quotes a...
From £2,544
Relax... you have found a reliable extension builder in NW2. Anahita Design and Development is a friendly and reliable company based in NW2 who con...
From £2,432
London, NW2
A family business with over 30 years of experience creating homes in London.We are a design and build contractor based in London, providing bespoke...
From £2,104
Trusted and professional extension builder in NW2. Experienced in all extension buildering work and keeping within budget and on quote. TKN BUILDER...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in NW2 it ranges from £2,104 (TKN BUILDERS & DEVELOPERS based in NW11) to £2,560 (A&J BUILDERS & DECORATORS LTD based in NW2).
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 NW2 by posting a job with HaMuch and we will send it to extension builders in NW2.
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 - £17,705

Two storey extension - £88,307

Build a timber frame extension - £26,205

Build a swimming pool - £81,205

Single storey extension - £59,096

Side return extension - £43,804

Install an RSJ - £2,405

Outbuilding - £10,205

Build a Mansard loft conversion - £52,205

Loft conversion - £35,670

Build a kitchen extension - £42,205

Hip to gable loft conversion - £42,205

Granny annexe - £87,205

Garden office - £10,205

Convert a Garage - £16,205

Garage - £18,705

Build a flat roof extension - £22,205

Build a dormer loft conversion - £42,205

Concrete foundations - £6,455

Convert a bungalow loft - £29,205

Convert a basement - £39,804