Separate toilet facilities are not required in buildings with an occupant load of how many or fewer?

According to the International Plumbing Code, separate toilet facilities are not required in buildings with an occupant load of 15 or fewer. This provision is based on the understanding that at lower occupancy levels, it is often feasible to have a single unisex restroom, which can adequately serve the needs of all occupants without the necessity for separated facilities.

The rationale behind this threshold recognizes that smaller buildings or spaces may not have the demand or traffic that justifies the complexity and cost of maintaining separate facilities for different genders. As occupancy increases, the likelihood of users needing access to facilities concurrently also rises, thus the code mandates separate facilities in buildings with higher occupant loads to provide for improved privacy and convenience.

Therefore, the correct answer aligns with the intent and regulations outlined in the code, emphasizing both practicality and user needs in smaller environments.