What constitutes a "change of use" in building occupancy?

A "change of use" refers specifically to altering the occupancy type of a building. This means that the intended purpose of the building is modified, such as converting a space that was once used as a retail store into an office or a residence. This change typically requires adherence to new building codes and regulations that address the different requirements for safety, accessibility, and health associated with the new occupancy type.

Understanding "change of use" is critical in building compliance because different types of occupancies are subject to various codes based on factors such as occupancy load, fire safety, and egress requirements. For example, a change from a low-risk occupancy to one with higher risks, such as an assembly occupancy, will necessitate additional safety measures that weren't required under the previous use.

In contrast, changing building materials, modifying building structures, or renovating interior designs may be part of building renovations or upgrades but do not inherently imply a change in the occupancy type. Each of these scenarios could involve substantial work and regulatory considerations, but they do not equate to altering how the building is primarily used or occupied, which is the defining characteristic of a "change of use."