An occupancy permit (or certificate of occupancy) is official permission to occupy or use a new or renovated building, issued after inspections confirm construction meets building codes and approved plans. Occupancy permits verify that safety systems work, structural elements are sound, and the building is suitable for its intended use. Moving into a building without an occupancy permit is illegal and may void insurance coverage. Permits may be issued as partial (allowing occupancy of completed portions) or full (the entire building). Building departments issue occupancy permits as the final step in the construction approval process, ensuring public safety before buildings are used.