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// CODE SNIPPET

1004.5 Areas Without Fixed Seating

Building Code 2018 of Illinois > 10 Means of Egress > 1004 Occupant Load > 1004.5 Areas Without Fixed Seating
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ILLUSTRATION
The number of occupants shall be computed at the rate of one occupant per unit of area as prescribed in Table 1004.5. For areas without fixed seating, the occupant load shall be not less than that number determined by dividing the floor area under consideration by the occupant load factor assigned to the function of the space as set forth in Table 1004.5. Where an intended function is not listed in Table 1004.5, the building official shall establish a function based on a listed function that most nearly resembles the intended function.
Exception: Where approved by the building official, the actual number of occupants for whom each occupied space, floor or building is designed, although less than those determined by calculation, shall be permitted to be used in the determination of the design occupant load.
TABLE 1004.5
MAXIMUM FLOOR AREA ALLOWANCES PER OCCUPANT
FUNCTION OF SPACE OCCUPANT LOAD FACTORa
Accessory storage areas, mechanical equipment room 300 gross
Agricultural building 300 gross
Aircraft hangars 500 gross
Airport terminal  
Baggage claim
20 gross
Baggage handling
300 gross
Concourse 
100 gross
Waiting areas
15 gross
Assembly  
Gaming floors (keno, slots, etc.)
11 gross
Exhibit gallery and museum
30 net
Assembly with fixed seats See Section 1004.6
Assembly without fixed seats  
Concentrated (chairs only—not fixed)
7 net
Standing space
5 net
Unconcentrated (tables and chairs)
15 net
Bowling centers, allow 5 persons for each lane including 15 feet of runway, and for additional areas 7 net
Business areas 150 gross
Concentrated business use areas See Section 1004.8
Courtrooms—other than fixed seating areas 40 net
Day care 35 net
Dormitories 50 gross
Educational  
Classroom area
20 net
Shops and other vocational room areas
50 net
Exercise rooms 50 gross
Group H-5 fabrication and manufacturing areas 200 gross
Industrial areas 100 gross
Institutional areas  
Inpatient treatment areas
240 gross
Outpatient areas
100 gross
Sleeping areas
120 gross
Kitchens, commercial 200 gross
Library  
Reading rooms
50 net
Stack area
100 gross
Locker rooms 50 gross
Mall buildings—covered and open See Section 402.8.2
Mercantile 60 gross
Storage, stock, shipping areas 300 gross
Parking garages 200 gross
Residential 200 gross
Skating rinks, swimming pools   
Rink and pool
50 gross
Decks
15 gross
Stages and platforms 15 net
Warehouses 500 gross
For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.
  1. Floor area in square feet per occupant.

1004.5.1 Increased Occupant Load

The occupant load permitted in any building, or portion thereof, is permitted to be increased from that number established for the occupancies in Table 1004.5, provided that all other requirements of the code are met based on such modified number and the occupant load does not exceed one occupant per 7 square feet (0.65 m2) of occupiable floor space. Where required by the building official, an approved aisle, seating or fixed equipment diagram substantiating any increase in occupant load shall be submitted. Where required by the building official, such diagram shall be posted.

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