Oa.sys is a subsidiary of Blumer Lehmann based in Alberschwende, Vorarlberg. Our team plans, produces and implements projects using timber systems and prefabricated timber elements, as well as supporting frameworks, energy-efficient renovations and additional storeys with high levels of prefabrication. Our project portfolio ranges from detached houses and apartment buildings to hotels and industrial and commercial constructions – including large-scale projects and as general contractors or joint general contractors.