The city of Surakarta is one of the densest cities in Indonesia. From the Surakarta Central Bureau of Statistics, the population density of Surakarta City reaches 12,000 people per one square kilometre. This certainly affects the magnitude of the increasing demand for clean water resources and the reduction of rainwater catchment areas which can lead to disasters such as floods and landslides. Therefore, a simple, sustainable roof design innovation which is easy to be built, is required, particularly in the residential area. This simple, sustainable roof is designed for a house with type 70/120 and inhabited by four people. The sustainable roof components are an extensive green roof with 5.1 meters long, 2.3 meters wide and 0.8-meter height using sedum grass, an application of rainwater harvesting with a capacity of 22000 litres to supply water demand for the inhabitants, as well as electricity for a pump that uses powered solar panel 100 WP.