Recognising the lack of local and economically accessible facilities, technologies, and public engagement in local recycling, the chapter tackles the challenge of introducing Circular Economy to cope with plastic waste in Copenhagen. The need for circular systemic innovation and holistic production models for recycling plastics led to consider how local micro entrepreneurs, SMEs, commercial resellers and citizens can collaborate for a common, sustainable goal. The chapter presents ‘Plastic In, Plastic Out’ (PIPO), a Circular system for local sourcing, recycling and production of sustainable plastic building materials and products.