Circular building has been increasing in popularity over several years. The idea being that we should not use resources only once and then discard them, but continue using them in new products. The construction industry has responded to this by designing 'circular' buildings that can be disassembled at the end of their functional life. This leaves the question open of what to do with the current buildings stock. Since the building stock only grows with approximately 1% a year, the lion's share of buildings that will be demolished in the next 50 years has already been built. This research explores five cases that are trying to solve this issue in different ways. The case studies are used as a basis to identify drivers, barriers, and opportunities for circular demolition and component reuse. The main drivers are environmental, societal, and behavioural in nature. Whereas the main barriers are economic, behavioural, and governmental. Opportunities for entrepreneurs and governments have been identified to overcome these barriers.