From £2,280
Need to find an Extension Builder near you for all your extension buildering work?
Sterling Pillar provides a local, trusted extension buil...
From £2,448
Woolwich London, SE18
Need to find an Extension Builder near you for all your extension buildering work?
PFM General Building Services Ltd provides a local, trus...
From £2,288
Trusted and professional extension builder in Woolwich. Experienced in all extension buildering work and keeping within budget and on quote. AM Bui...
From £3,040
Woolwich London, SE18
S M G Building Contractors is a trusted extension builder serving customers in Woolwich and the surrounding area. Contact us to today to get a comp...
From £2,280
Dry Spell Builders are here to help customers who need an Extension Builder in Woolwich. We offer a competitive rate to complete all your extension...
From £2,720
Woolwich London, SE18
JASPG excel in finding investment opportunities, working together with clients and partners to achieve optimal results. We project manage from star...
From £2,088
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,120
Keane & Sons Paving is an established and experienced local extension builder in Woolwich. Please contact us for a free, no obligation quote and co...
From £2,104
Builder.Special is an established and experienced local extension builder in Woolwich. Please contact us for a free, no obligation quote and compet...
From £2,192
Need an Extension Builder in Woolwich? Iris Construction has been helping local clients (10 mile radius) with their extension buildering jobs for m...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Woolwich it ranges from £2,088 (Thomas Welch & Sons based in SE18) to £3,040 (S M G Building Contractors based in SE18).
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 Woolwich by posting a job with HaMuch and we will send it to extension builders in Woolwich.
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 - £17,656

Two storey extension - £88,234

Build a timber frame extension - £26,156

Build a swimming pool - £81,156

Single storey extension - £58,120

Side return extension - £43,255

Install an RSJ - £2,356

Outbuilding - £10,156

Build a Mansard loft conversion - £52,156

Loft conversion - £35,213

Build a kitchen extension - £42,156

Hip to gable loft conversion - £42,156

Granny annexe - £87,156

Garden office - £10,156

Convert a Garage - £16,156

Garage - £18,656

Build a flat roof extension - £22,156

Build a dormer loft conversion - £42,156

Concrete foundations - £6,406

Convert a bungalow loft - £29,156

Convert a basement - £39,255