Fresh fish and fresh vegetables harvested directly from the roof, produced with treated wastewater from the building. This is the vision of the Roof water-farm (RWF) Project. This chapter describes how the project has developed by combining a range of existing technologies such as new housing design, grey-water recycling, hydroponics and aquaponics. It discusses key steps such as planning as well as communication and education strategies needed to involve key actors and win public support. It also reviews challenges in moving from the pilot stage to practical implication as well as potential for the future.