When may locks, bolts, and chains be installed on exits?

Locks, bolts, and chains may be installed on exits when the building is unoccupied. This practice aligns with safety regulations that prioritize clear and unobstructed egress for occupants during emergency situations. When a building is unoccupied, it may be permissible to secure exits to prevent unauthorized access or vandalism without compromising the safety of individuals who should be able to evacuate swiftly during a fire or other emergencies.

In contrast, occupying conditions, whether during regular use or activities like fire drills, require that all exits remain accessible without any obstruction, ensuring that occupants can exit the premises safely and promptly. The same applies to renovation scenarios, where active use or potential occupancy can occur, necessitating unimpeded access to exits for safety. Hence, the installation of such security measures is restricted primarily to when the building is not in use.