A coworker just took a class on NFPA 101 and it wasn't clear: What is the difference between change of use and change of occupancy?
The best way I can explain it is this:
Change of occupancy- From business to educational. Ex: Office building converted to a school
Change of use: A widget factory becomes a rocket manufacturer. Occupancy remains industrial but the use changes within the occupancy type.
NFPA 101- 3.3.43 Change of Occupancy Classification. The change in the occupancy classification of a structure or portion of a structure. (I guess they didn't have the same English teacher as me, I was taught you can't use the word(s) you're defining in the definition).
NFPA 101- 3.3.43 Change of Use. A change in the purpose or level of activity within a structure that involves a change in eh application requirements of the Code.
NFPA 101- 3.3.190 Occupancy. The purpose for which a building or other structure, or part thereof, is used or intended to be used.
NFPA 101- 4.6.11 Change of Use or Occupancy classification. In any building or structure, whether or not a physical alteration is needed, a change from one use or occupancy classification to another shall comply with 4.6.7.
The terms are nearly interchangeable in most cases, but not always. A change of use can be just that, how the building is used and may or may not constitute a change in occupancy type. For example a single family dwelling could be converted to a two family changing how the building is used, but not changing the occupancy chapter. There are also sub-classifications in the occupancy chapters that may not change the type of occupancy (Mercantile comes to mind) but could change in use (larger or smaller sub-class).
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