The rainwater harvesting locally collects and stores rainfall through different technologies, for future use to meet the demands of human consumption or human activities. However, rainwater harvesting has much wider perspectives, in particular, if it is considered in relation to its role in supporting ecosystem goods and services. An integrated planning for Rooftop Rain Water Harvesting system for different institutes in the premises an educational complex is done. The main objectives of the study are to estimate the rooftop rain water harvesting potential of all buildings, planning and designing the rooftop rain water harvesting system, the conveyance system and the groundwater recharge system. The cost estimation of different components of roof top rain water harvesting project for each zone is done. The annual equivalent capital cost is estimated with and without the cost of ground water recharge structure. The unit cost of water is high as compared to the market price of water. However, the environmental benefits of the ground water recharging with good quality water justifies such projects.