Established in 1810 and trading as Collen Bros. until 1984, Collen Construction is one of the leading construction firms in Ireland. Collen's portfolio includes commercial, fit-out, data centres, substations, biopharma, industrial warehousing, retail, residential, healthcare, conservation and education projects, ranging in value from under €1 million up to €750 million. The company specializes in the delivery of data centres and is recognized as a leader within the data centre build environment with projects in Ireland, Germany and Sweden.