What classification system is used for arranging buildings based on their occupancy?

The classification system used for arranging buildings based on their occupancy is referred to as Building Classification. This system categorizes buildings according to how they are intended to be used, which can encompass a variety of activities such as residential, commercial, industrial, and institutional purposes. Understanding building classification is crucial for plumbing and other construction codes because different categories have unique requirements and safety considerations that must be adhered to during design and construction.

While "Occupancy Rate" might refer to the percentage of a building that is occupied at a given time, it does not classify the building based on its intended use. "Use Category" also relates to the function of the building, but it is not the correct formal term commonly used in code contexts. "Structural Type" pertains to the materials and methods used in the construction of a building, which does not directly indicate how the building is occupied or the activities occurring within it. Thus, Building Classification is the appropriate term and system to use when discussing the arrangement of buildings based on occupancy.