Adaptis is a decision-support software solution for optimal decarbonization planning of existing buildings, as part of renovations, retrofits, and adaptive reuse, and circularity planning in new construction to improve quality and lower planning costs for building owners and consultants. Our platform first analyzes existing building conditions, then generates automated adaptation feasibility design options, and material recovery and deconstruction scenarios. Lastly, the platform optimizes generated options for environmental and economic performance.