The Zimmermann OZ is a company that provides unique German expertise and knowledge to new energy-efficient sustainable home builds and renovation projects in Australia. We offer high-quality craftsmanship and guidance in building or retrofitting homes to achieve high energy efficiency & healthy, mould free homes. The Zimmermann OZ is a member of Passive House Australia and Sustainable Builders Alliance, and it is proud to bring its extensive knowledge and experience in building Passive Houses from Germany to Australia.