The Certificate of Occupancy application begins the process for certifying a building’s compliance with applicable building codes and Zoning Ordinance, and indicating the building is in a condition suitable for occupancy. Once the application is approved, the Certificate of Occupancy (CO) states that a building, structure or the proposed use of a building or land is in compliance with all applicable laws, Arlington County Ordinances, and regulations. No occupancy can take place until a CO is issued. This applies to a new building, a change in use, or a change in occupant (other than residential). Learn more about acquiring a Certificate of Occupancy here.