This research paper presents the structural design and comprehensive cost analysis of a proposed waste management plant in Sivagangai District, Tamil Nadu, India. The plant is designed to efficiently manage solid waste generated in the region, emphasizing sustainability, health, and environmental safety. The project is divided into seven phases, beginning with pre-construction activities and culminating in the operational handover. The design encompasses civil works, machinery, and equipment necessary for waste processing, including segregation, composting, and leachate treatment. A cost analysis based on reference projects highlights estimated expenses related to land acquisition, civil works, machinery procurement, and operational costs, with a total projected cost of Rs. 3.6 crores, factoring in contingencies for unforeseen delays and expenses. The approximate area required for a solid waste management plant can vary depending on the waste processing capacity and specific design. For a plant processing about 500 to 1,000 metric tonnes per day, the area typically ranges from 5 to 10 acres, which includes space for sorting facilities, composting, landfill, leachate treatment, and other necessary infrastructure. This study provides a region-specific integrated waste management model for medium-scale districts in Tamil Nadu, bridging the gap between conceptual policy guidelines and implementable engineering design. The findings offer a scalable framework that can be replicated in similar semi-urban districts across India. For the proposed plant processing 150 metric tonnes per day in Sivagangai District, the estimated area could be in the range of 8 to 12 acres, considering efficient land use and infrastructure integration.