The objective of this research is to analyze an economic feasibility of waste sorting plant construction project of Patunnakure Sub District Municipality, Lampang, Thailand. Data used in this research obtained from the previous studies, the interview with the entrepreneurs of the recyclable waste sorting plants, and the information of waste from Patunnakure Sub District in terms of costs and benefits of this project. Then, the costs and the benefits were analyzed to find out the economic value by using the indicators: the net present value (NPV), the benefit-cost ratio (BCR), and the internal rate of return (IRR) in this project which is scheduled to 20 years and has the discount rate at 12%.