UpCodes logo
Go To Full Code Chapter
Each building and structure shall be assigned an occupancy category in accordance with Table 1604.5.
TABLE 1604.5
OCCUPANCY CATEGORY OF BUILDINGS AND OTHER STRUCTURES
OCCUPANCY
CATEGORY
NATURE OF OCCUPANCY
I Buildings and other structures that represent a low hazard to human life in the event of failure, including but not limited to:
II Buildings and other structures except those listed in Occupancy Categories I, III and IV
III Buildings and other structures that represent a substantial hazard to human life in the event of failure, including but not limited to:
IV Buildings and other structures designated as essential facilities, including but not limited to:
  • Group I-2 occupancies having surgery or emergency treatment facilities.
  • Fire, rescue, ambulance and police stations and emergency vehicle garages.
  • Designated earthquake, hurricane or other emergency shelters.
  • Designated emergency preparedness, communications and operations centers and other facilities required for emergency response.
  • Power-generating stations and other public utility facilities required as emergency backup facilities for Occupancy Category IV structures.
  • Structures containing highly toxic materials as defined by Section 307 where the quantity of the material exceeds the maximum allowable quantities of Table 307.1(2).
  • Aviation control towers, air traffic control centers and emergency aircraft hangars.
  • Buildings and other structures having critical national defense functions.
  • Water storage facilities and pump structures required to maintain water pressure for fire suppression.
  1.  For purposes of occupant load calculation, occupancies required by Table 1004.1.1 to use gross floor area calculations shall be permitted to use net floor areas to determine the total occupant load.
1604.5.1 Multiple Occupancies
Where a building or structure is occupied by two or more occupancies not included in the same occupancy category, it shall be assigned the classification of the highest occupancy category corresponding to the various occupancies. Where buildings or structures have two or more portions that are structurally separated, each portion shall be separately classified. Where a separated portion of a building or structure provides required access to, required egress from or shares life safety components with another portion having a higher occupancy category, both portions shall be assigned to the higher occupancy category.

Related Code Sections

1604.5 Structural Design, Occupancy Category
Each building and structure shall be assigned an occupancy category in accordance with Table 1604.5. TABLE 1604.5 OCCUPANCY CATEGORY OF BUILDINGS ...
3412.6.16.1 Existing Structures, Categories
The categories for mixed occupancies are: Category a—Occupancies separated by minimum 1-hour fire barriers or minimum 1-hour horizontal ...
1301.6.16.1 Performance Compliance Methods, Categories
The categories for mixed occupancies are: Category a—Occupancies separated by minimum 1-hour fire barriers or minimum 1-hour horizontal assemblies ...
3408.4 Existing Structures, Seismic
When a change of occupancy results in a structure being reclassified to a higher occupancy category, the structure shall conform to the seismic ...