From £2,160
Satau Construction Works Ltd is an established and experienced local extension builder in Thamesmead. Please contact us for a free, no obligation q...
From £2,472
Thamesmead Greater London, SE28
Trusted and professional extension builder in Thamesmead. Experienced in all extension buildering work and keeping within budget and on quote. GHOO...
From £2,120
Keane & Sons Paving is an established and experienced local extension builder in Thamesmead. Please contact us for a free, no obligation quote and ...
From £2,456
Thamesmead London, SE28
Relax... you have found a reliable extension builder in Thamesmead. Great britton builders is a friendly and reliable company based in Thamesmead w...
From £2,416
Experienced extension builder ready to quote for your work. Liviu Toma is the best extension builder in Thamesmead. No obligation free quotes and m...
From £3,040
S M G Building Contractors is a trusted extension builder serving customers in Thamesmead and the surrounding area. Contact us to today to get a co...
From £2,280
Dry Spell Builders are here to help customers who need an Extension Builder in Thamesmead. We offer a competitive rate to complete all your extensi...
From £2,488
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,448
Need to find an Extension Builder near you for all your extension buildering work?
PFM General Building Services Ltd provides a local, trus...
From £2,280
Need to find an Extension Builder near you for all your extension buildering work?
Sterling Pillar provides a local, trusted extension buil...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Thamesmead it ranges from £2,120 (Keane & Sons Paving based in SE28) 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 Thamesmead by posting a job with HaMuch and we will send it to extension builders in Thamesmead.
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 - £17,716

Two storey extension - £88,324

Build a timber frame extension - £26,216

Build a swimming pool - £81,216

Single storey extension - £59,320

Side return extension - £43,930

Install an RSJ - £2,416

Outbuilding - £10,216

Build a Mansard loft conversion - £52,216

Loft conversion - £35,775

Build a kitchen extension - £42,216

Hip to gable loft conversion - £42,216

Granny annexe - £87,216

Garden office - £10,216

Convert a Garage - £16,216

Garage - £18,716

Build a flat roof extension - £22,216

Build a dormer loft conversion - £42,216

Concrete foundations - £6,466

Convert a bungalow loft - £29,216

Convert a basement - £39,930