Solar rooftop photovoltaic installation is one of the most popular setups used in the country of India, being economical and apt for the space available in the country. This paper focuses on the key aspects of the design involved in the setup of the system, regarding not just the engineering design for a PV system, but also other key components such as installation site evaluation of a given rooftop to the final cost analysis. Hence, the discussion in the paper will give the average understanding of how a rooftop photovoltaic system is processed through in this country from an engineer’s point of view.