This paper discusses how emerging issues in housing construction could revolutionise the building industry. It focuses on commons-based networks of organisations, technologies and users that form a niche practice on the margins of the dominant paradigm. This practice can be understood as "Design Global, Manufacture Local" and is exemplified by the Hexayurt, the Open Source Ecology Microhouse and the WikiHouse. Using these descriptive case studies, light is shed on the challenges and opportunities of open construction systems with regard to technological, institutional and social perspectives. Notwithstanding the positive dynamics, certain issues need to be addressed, so that a sustainable built environment could flourish.