Which statement best describes occupancy in building codes?

• A. The physical size of a space
• B. The number of occupants
• C. The use of all or a portion of a building
• D. The building's fire rating

Answer: (C)

Occupancy in building codes refers to how a space or portion of a building is used—the function of the space. This classification determines which safety provisions apply, such as means of egress, fire protection, and other requirements, because different uses have different risk profiles and needs. It’s not about how big the space is (that’s floor area), nor about how many people are present (occupant load is a related but separate consideration), and it isn’t about the building’s fire resistance rating (which concerns construction, not use). By labeling spaces by their use, codes can prescribe the appropriate protections for that occupancy, whether a room is used for assembly, storage, business, or another purpose.