From feasibility assessment to final walkthrough, converting a structure into a two-story ADU with a rooftop patio involves careful planning and execution. Key steps include checking zoning regulations, budgeting, hiring professionals (architect, engineer, contractor), obtaining permits, and preparing the site. Construction phases cover framing, exterior and interior work, and installing MEP systems. The rooftop patio is built with safety features and finishing touches. Final inspections, landscaping, and furnishing complete the project, ensuring a functional and beautiful ADU ready for occupancy.