From £1,560
John Sillitoe Building Contractor is a trusted extension builder serving customers in Rhayader and the surrounding area. Contact us to today to get...
From £1,712
Relax... you have found a reliable extension builder in Rhayader. EVABUILD LIMITED is a friendly and reliable company based in Rhayader who conside...
From £1,816
Experienced extension builder ready to quote for your work. DRAGON CONSTRUCTION T/A is the best extension builder in Rhayader. No obligation free q...
From £1,784
Need to find an Extension Builder near you for all your extension buildering work?
Cherry Build Limited provides a local, trusted extension...
From £1,984
ST Building is a team of reliable and experienced contractors in mid- wales and Herefordshire with 20 years in the trade.We achieve hig...
From £1,912
K M Lewis T/A Summergill Developments is an established extension buildering business in Rhayader. We come highly recommended and provide competiti...
From £1,808
Our building services company SP Coupland Ltd have thirty-eight years’ experience and have been helping customers in Sir Ceredigion and the surro...
From £1,720
Need to find an Extension Builder near you for all your extension buildering work?
SDW CONSTRUCTION LTD provides a local, trusted extension...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Rhayader it ranges from £1,560 (John Sillitoe Building Contractor based in SY16) to £1,984 (ST Building based in LD8).
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 Rhayader by posting a job with HaMuch and we will send it to extension builders in Rhayader.
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 - £17,087

Two storey extension - £87,381

Build a timber frame extension - £25,587

Build a swimming pool - £80,587

Single storey extension - £46,740

Side return extension - £36,854

Install an RSJ - £1,787

Outbuilding - £9,587

Build a Mansard loft conversion - £51,587

Loft conversion - £29,878

Build a kitchen extension - £41,587

Hip to gable loft conversion - £41,587

Granny annexe - £86,587

Garden office - £9,587

Convert a Garage - £15,587

Garage - £18,087

Build a flat roof extension - £21,587

Build a dormer loft conversion - £41,587

Concrete foundations - £5,837

Convert a bungalow loft - £28,587

Convert a basement - £32,854