Mexico City, like cities in most developing countries has seen a sharp increase in its urban population. With an estimated 70% of the world’s population living in cities by 2050, the demand for affordable housing will increase as well. More houses, means more material needed for construction, increasing the carbon footprint of Mexico. Through this project, we propose to integrate the local economies of waste recycling and the informal housing industry into a decentralized circular economy system to solve the affordable housing crisis and cleaning up our environment. For this purpose, we have designed a set of building elements using waste plastic and fly ash which can be produced locally through injection molding, to empower communities to build their own houses, making housing construction simpler, cheaper, faster and most importantly more sustainable.