From £2,072
K H CONSTRUCTION are here to help customers who need an Extension Builder in Upminster. We offer a competitive rate to complete all your extension ...
From £2,352
Essex, RM14
Need an Extension Builder in Upminster? Lee Kyson Building Consultancy Ltd has been helping local clients (10 mile radius) with their extension bui...
From £2,208
Need an Extension Builder in Upminster? TOGA CONSTRUCTION LTD has been helping local clients (10 mile radius) with their extension buildering jobs ...
From £2,208
Upmins, RM14
Need to find an Extension Builder near you for all your extension buildering work?
Advanced Glazing Systems Ltd provides a local, trusted e...
From £2,024
Trusted and professional extension builder in Upminster. Experienced in all extension buildering work and keeping within budget and on quote. V&L C...
From £2,304
Need to find an Extension Builder near you for all your extension buildering work?
London Construction Team Ltd provides a local, trusted e...
From £2,208
Experienced extension builder ready to quote for your work. Casa building services Ltd is the best extension builder in Upminster. No obligation fr...
From £2,280
ESSEX TIMBER BUILDINGS LTD is an established extension buildering business in Upminster. We come highly recommended and provide competitive quotes ...
From £2,224
Phull Design & Build Ltd are here to help customers who need an Extension Builder in Upminster. We offer a competitive rate to complete all your ex...
From £2,152
TEB Builders Limited are here to help customers who need an Extension Builder in Upminster. We offer a competitive rate to complete all your exten...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Upminster it ranges from £2,024 (V&L Construction LTD based in rm14) to £2,352 (Lee Kyson Building Consultancy Ltd based in RM14).
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 Upminster by posting a job with HaMuch and we will send it to extension builders in Upminster.
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 - £17,503

Two storey extension - £88,005

Build a timber frame extension - £26,003

Build a swimming pool - £81,003

Single storey extension - £55,064

Side return extension - £41,536

Install an RSJ - £2,203

Outbuilding - £10,003

Build a Mansard loft conversion - £52,003

Loft conversion - £33,780

Build a kitchen extension - £42,003

Hip to gable loft conversion - £42,003

Granny annexe - £87,003

Garden office - £10,003

Convert a Garage - £16,003

Garage - £18,503

Build a flat roof extension - £22,003

Build a dormer loft conversion - £42,003

Concrete foundations - £6,253

Convert a bungalow loft - £29,003

Convert a basement - £37,536