From £2,120
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,112
Hanwell, W7
Trusted and professional extension builder in Hanwell. Experienced in all extension buildering work and keeping within budget and on quote. SHAKESP...
From £2,648
Honest friendly builder:) 15years trading in West London. Manny happy costumers you can talk to.
From £2,208
Greater London, W7
Trusted and professional extension builder in Hanwell. Experienced in all extension buildering work and keeping within budget and on quote. New Lin...
From £2,392
BG Lofts and Extensions LTD is an established extension buildering business in Hanwell. We come highly recommended and provide competitive quotes f...
From £2,448
Hanwell, W7
Autoroll Repairs is a trusted extension builder serving customers in Hanwell and the surrounding area. Contact us to today to get a competitive quo...
From £2,160
DRAYTON BUILDERS LTD is an established and experienced local extension builder in Hanwell. Please contact us for a free, no obligation quote and co...
From £2,368
Hanwell, W7
GN Property Services Ltd are here to help customers who need an Extension Builder in Hanwell. We offer a competitive rate to complete all your exte...
From £2,608
Welcome to Sparrow Design & Build. We are a Design and Build company who provide a turnkey service ranging from conceptual architectural design to ...
From £2,296
Hanwell, W7
In Home Building Construction Ltd are here to help customers who need an Extension Builder in Hanwell. We offer a competitive rate to complete all ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Hanwell it ranges from £2,112 (SHAKESPEARE ROOFING AND BUILDI based in W7) to £2,648 (W5 Construction Ltd based in W13).
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 Hanwell by posting a job with HaMuch and we will send it to extension builders in Hanwell.
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 - £17,636

Two storey extension - £88,204

Build a timber frame extension - £26,136

Build a swimming pool - £81,136

Single storey extension - £57,720

Side return extension - £43,030

Install an RSJ - £2,336

Outbuilding - £10,136

Build a Mansard loft conversion - £52,136

Loft conversion - £35,025

Build a kitchen extension - £42,136

Hip to gable loft conversion - £42,136

Granny annexe - £87,136

Garden office - £10,136

Convert a Garage - £16,136

Garage - £18,636

Build a flat roof extension - £22,136

Build a dormer loft conversion - £42,136

Concrete foundations - £6,386

Convert a bungalow loft - £29,136

Convert a basement - £39,030