14B-5-501 General.
14B-5-502 Building address.
14B-5-503 General building height and area limitations.
14B-5-504 Building height and number of stories.
14B-5-505 Mezzanines and equipment platforms.
14B-5-506 Building area.
14B-5-507 IBC Section 507.
14B-5-508 Mixed use and occupancy.
14B-5-509 Incidental uses.
14B-5-510 IBC Section 510.
The provisions of Section 501 of IBC are adopted by reference with the following modification:
1. Revise Section 501.1 by adding a second paragraph to read:
"Nothing in this chapter shall be interpreted to prevent the application of other limitations provided by the Chicago Zoning Ordinance."
The provisions of Section 502 of IBC are adopted by reference with the following modification:
1. Revise Section 502.1 to read:
"502.1 Address identification.
The provisions of Section 503 of IBC are adopted by reference with the following modifications:
1. Revise Section 503.1 to read:
"503.1 General.
Unless otherwise specifically modified in Chapter 4 and this chapter, building height, number of stories above grade plane and building area shall not exceed the limits specified in Sections 504 and 506 based on the type of construction as determined by Section 602 and the occupancies as determined by Section 302 except as modified hereafter. Building height, number of stories above grade plane and building area provisions shall be applied independently. For the purposes of determining building area limitations, building height limitations and type of construction, each portion of a structure separated by one or more fire walls complying with Section 706 shall be considered to be a separate building."
2. Revise Section 503.1.1 to read:
"503.1.1 Special industrial occupancies.
Single-story buildings and structures of Type I or II construction used exclusively for the production and distribution of electricity, gas or steam or for low-hazard industrial processes that require large areas and unusual building heights to accommodate craneways or special machinery and equipment shall be exempt from the building height and building area limitations specified in Sections 504 and 506."
3. Revise Section 503.1.2 to read:
"503.1.2 Buildings on same lot.
Two or more buildings on the same lot shall be regulated as separate buildings.
Exception: Two or more buildings on the same lot of record may be considered as portions of one building where the building height and number of stories above grade plane of each building and the aggregate building area of the buildings are within the limitations specified in Sections 504 and 506. The provisions of this code applicable to the aggregate building shall be applicable to each building."
4. Delete Section 503.1.3.
5. Revise Section 503.1.4 and its subsections to read:
"503.1.4 Occupiable rooftops.
A roof level or portion thereof shall be permitted to be used as an occupiable rooftop provided the occupancy of the roof is an occupancy that is permitted by Table 504.4 for the story immediately below the roof. The area of the occupiable rooftop shall not be included in the building area as regulated by Section 506.
Exception: The occupancy located on an occupiable rooftop shall not be limited to the occupancies allowed on the story immediately below the occupiable rooftop where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 and occupant notification in accordance with Section 907.5 is provided in the area of the occupiable rooftop."
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 15)
The provisions of Section 504 of IBC are adopted by reference with the following modifications:
1. Revise Section 504.1, excluding the exception, to read:
"504.1 General.
The allowable building height, in feet, and the allowable number of stories above grade plane of a building shall be determined based on the type of construction, occupancy classification and whether there is an automatic sprinkler system installed throughout the building."
2. Delete Section 504.1.1.
3. Delete Section 504.1.2.
4. Revise Section 504.3 to read:
"504.3 Height in feet.
The maximum building height, in feet, of a building shall not exceed the limits specified in Table 504.3.
Exception: Towers, spires, minarets, steeples and other rooftop structures with a footprint not exceeding 25 percent of the ground area of the building on which they are erected shall be constructed of materials consistent with the required type of construction of the building except where other construction is permitted by Section 1510.2.4. Such rooftop structures shall not be used for habitation or storage. The rooftop structures shall not extend more than 60 feet (18.3 m) above the allowable building height where of noncombustible materials and shall not extend more than 20 feet (6096 mm) above the allowable building height where of combustible materials (see Chapter 15 for additional requirements)."
5. Replace Table 504.3 as shown:
TABLE 504.3
ALLOWABLE BUILDING HEIGHT IN FEET ABOVE GRADE PLANE a
ALLOWABLE BUILDING HEIGHT IN FEET ABOVE GRADE PLANE a
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | |||||||||
SEE FOOTNOTES | TYPE I | TYPE II | TYPE III | TYPE IV | TYPE V | |||||
A | B | A | B | A | B | HT | A | B | ||
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | |||||||||
SEE FOOTNOTES | TYPE I | TYPE II | TYPE III | TYPE IV | TYPE V | |||||
A | B | A | B | A | B | HT | A | B | ||
A, B, E, F, H-4 c, M, S, U | NS b | 80 | 80 | 65 | 30 | 55 | 30 | 65 | 30 | 15 |
S | UL | 150 | 85 | 45 | 70 | 45 | 85 g | 45 | 30 | |
H-1, H-2, H-3, H-5 | NS c, d | 80 | 80 | 65 | 30 | 55 | NP | 65 | NP | NP |
S | UL | |||||||||
I | NS b | 80 | 80 | 65 | 30 | 55 | 30 | 65 | 30 | NP |
S | UL | 150 | 85 | |||||||
R | NS b | 80 | 80 | 65 | 30 | 55 | 30 | 65 | 30 e | 20 |
S13D | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 35 | |
S13R | 55 | 55 | 55 | 45 | 55 | 45 | 55 | 45 f | 35 | |
S | UL | 150 | 85 | 45 | 70 | 45 | 85 g | 45 f | 35 | |
For SI: 1 foot = 304.8 mm.
UL = Unlimited.
NS = Buildings not equipped throughout with an automatic sprinkler system.
S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2.
S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable building height in this table.
b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing buildings in accordance with the Chicago Building Rehabilitation Code.
e. Group R occupancies of Type VA construction shall be allowed to be 40 feet in building height, provided that the finished floor level of the highest occupiable space shall not exceed 30 feet above grade plane.
f. Group R occupancies of Type VA construction equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 shall be allowed to be 55 feet in building height, provided that the finished floor level of the highest occupiable space shall not exceed 40 feet above grade plane.
g. 120 feet for evaluation of buildings constructed or permitted for construction before January 1, 1951, that are equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.
6. Revise Section 504.4 to read:
"504.4 Number of stories above grade plane.
The maximum number of stories above grade plane of a building shall not exceed the limits specified in Table 504.4."
7. Replace Table 504.4 as shown:
TABLE 504.4
ALLOWABLE NUMBER OF STORIES ABOVE GRADE PLANE a, b
ALLOWABLE NUMBER OF STORIES ABOVE GRADE PLANE a, b
OCCUPANCY CLASSIFICATION
|
SEE NOTES
|
TYPE OF CONSTRUCTION
| ||||||||
TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| ||
OCCUPANCY CLASSIFICATION
|
SEE NOTES
|
TYPE OF CONSTRUCTION
| ||||||||
TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| ||
A-1 | NS | UL | 5 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 6 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-2 | NS | UL | 10 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 11 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-3 | NS | UL | 10 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 11 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-4 | NS | UL | 10 | 3 | 1 | 2 | NP | 2 | 1 | NP |
S-13 | UL | 11 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
A-5 | NS | UL | UL | UL | UL | 1 | 1 | UL | 1 | 1 |
S-13 | UL | UL | UL | UL | 1 | 1 | UL | 1 | 1 | |
B | NS | UL | 11 | 6 | 1 | 4 | 2 | 5 | 1 | NP |
S-13 | UL | 12 | 7 | 2 | 5 | 3 | 6 | 2 | 1 | |
E-1 | NS | UL | 5 | 3 | 1 | 1 | 1 | 1 | 1 | NP |
S-13 | UL | 6 | 4 | 1 | 2 | 1 | 2 | 1 | NP | |
E-2 | NS | UL | 5 | 3 | 1 | 1 | 1 | 1 | 1 | NP |
S-13 | UL | 6 | 4 | 1 | 2 | 1 | 2 | 1 | NP | |
F-1 | NS | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 5 | 1 | 1 | |
F-2 | NS | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 5 | 1 | 1 | |
H-1 | NS c, d | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | NP |
S-13 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | NP | |
H-2 | NS c, d | UL | 3 | 2 | 1 | 2 | 1 | 1 | NP | NP |
S-13 | UL | 3 | 2 | 1 | 2 | 1 | 1 | NP | NP | |
H-3 | NS c, d | UL | 5 | 3 | 1 | 3 | 2 | 3 | NP | NP |
S-13 | UL | 5 | 3 | 1 | 3 | 2 | 3 | NP | NP | |
H-4 | NS c, d | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | NP |
S-13 | UL | 6 | 5 | 1 | 4 | 3 | 5 | 1 | NP | |
H-5 | NS c, d | 4 | 4 | 3 | 1 | 3 | 2 | 3 | NP | NP |
S-13 | 4 | 4 | 3 | 1 | 3 | 2 | 3 | NP | NP | |
I-1, Condition 1 | NS d, e | UL | 9 | 3 | 1 | 2 | 1 | 2 | 1 | NP |
S-13 | UL | 10 | 4 | 2 | 3 | 1 | 3 | 1 | NP | |
I-1, Condition 2 | NS d, e | UL | 4 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 5 | 4 | 1 | 1 | NP | 1 | 1 | NP | |
I-2, Condition 1 | NS f | UL | 4 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 5 | 4 | 1 | 1 | NP | 1 | 1 | NP | |
I-2, Condition 2 | NS f | UL | 4 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 5 | 4 | 1 | 1 | NP | 1 | 1 | NP | |
I-3 | NS d, e | UL | 9 | 2 | 1 | 1 | NP | 1 | 1 | NP |
S-13 | UL | 10 | 3 | 1 | 1 | NP | 1 | 1 | NP | |
I-4 | NS | UL | 9 | 3 | 1 | 1 | NP | 1 | 1 | NP |
S-13 d, g | UL | 10 | 4 | 1 | 2 | NP | 3 | 1 | NP | |
M | NS | UL | 11 | 6 | 1 | 4 | 2 | 5 | 1 | NP |
S-13 | UL | 12 | 7 | 2 | 5 | 3 | 6 | 1 | 1 | |
R-1 h | NS d | UL | 11 | 4 | 1 | 4 | 2 | 4 | 2 | 1 |
S-13R | 4 | 4 | 4 | 2 | 4 | 2 | 4 | 2 | 1 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 3 | 2 | |
R-2 | NS | UL | 11 | 4 | 1 | 4 | 2 | 4 | 2 | 1 |
S-13R | 4 | 4 | 4 | 2 | 4 | 3 | 4 | 4 | 2 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 4 | 2 | |
R-3 h | NS | UL | 11 | 4 | 1 | 4 | 2 | 4 | 2 | 1 |
S-13D | 3 | 3 | 3 | 2 | 3 | 2 | 3 | 3 | 2 | |
S-13R | 4 | 4 | 4 | 2 | 4 | 3 | 4 | 4 | 2 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 4 | 2 | |
R-4 h | NS d | UL | 11 | 4 | 1 | 4 | 2 | 4 | NP | NP |
S-13D | 3 | 3 | 3 | 2 | 3 | 2 | 3 | 3 | 2 | |
S-13R | 4 | 4 | 4 | 2 | 4 | 3 | 4 | 3 | 2 | |
S-13 | UL | 12 | 6 | 2 | 5 | 3 | 5 | 3 | 2 | |
R-5 | NS | UL | 11 | 4 | 1 | 4 | 3 | 4 | 3 | 2 |
S-13D | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | |
S-13R | 4 | 4 | 4 | 3 | 4 | 3 | 4 | 4 | 2 | |
S-13 | UL | 12 | 6 | 3 | 5 | 3 | 5 | 4 | 2 | |
S-1 | NS | UL | 5 | 4 | 1 | 3 | 2 | 5 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 6 | 1 | 1 | |
S-2 | NS | UL | 5 | 4 | 1 | 3 | 2 | 5 | 1 | 1 |
S-13 | UL | 6 | 5 | 2 | 4 | 3 | 6 | 1 | 1 | |
U | NS | UL | 5 | 4 | 1 | 3 | 2 | 4 | 1 | 1 |
S-13 | UL | 6 | 5 | 1 | 4 | 3 | 5 | 1 | 1 | |
UL = Unlimited.
NP = Not permitted.
NS = Buildings not equipped throughout with an automatic sprinkler system.
S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2.
S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable number of stories above grade plane in this table.
b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing buildings in accordance with the Chicago Building Rehabilitation Code.
e. New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies, Condition 1, see Exception 1 of Section 903.2.6.
f. New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and the Chicago Minimum Requirements for Existing Buildings.
g. For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6.
h. New Group R-1, R-3 and R-4 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8.
(Amend Coun. J. 7-24-19, p. 3646, §§ 28, 29; Amend Coun. J. 2-19-20, p. 14473, Art. II, § 16; Amend Coun. J. 6-25-21, p. 32180, Art. II, § 5; Amend Coun. J. 1-26-22, p. 43756, Art. II, § 4)
The provisions of Section 505 of IBC are adopted by reference with the following modifications:
1. Revise Section 505.2 to read:
"505.2 Mezzanines.
A mezzanine or mezzanines in compliance with Section 505.2 shall be considered a portion of the story below. Such mezzanines shall not contribute to the number of stories above grade plane as regulated by Section 503.1. The area of the mezzanine shall be included in determining the building area and the fire area. The clear height above and below the mezzanine floor construction shall be not less than 7 feet (2134 mm)."
2. Revise Section 505.2.1 to read:
"505.2.1 Area limitation.
The aggregate area of a mezzanine or mezzanines within a room shall be not greater than twenty percent of the floor area of that room or space in which they are located. The enclosed portion of a room shall not be included in a determination of the floor area of the room in which the mezzanine is located. In determining the allowable mezzanine area, the area of the mezzanine shall not be included in the floor area of the room.
Exceptions:
1. The aggregate area of mezzanines in buildings of Type I or II construction for special industrial occupancies in accordance with Section 503.1.1 shall be not greater than two-thirds of the floor area of the room.
2. [Reserved.]
3. The aggregate area of a mezzanine within a dwelling unit that is located in a building equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 shall not be greater than one-half of the floor area of the room, provided that both:
3.1. Except for enclosed closets and bathrooms, the mezzanine shall be open to the room in which such mezzanine is located.
3.2. The opening to the room shall be unobstructed except for walls not more than 48 inches (1219 mm) in height, columns and posts."
3. Revise Section 505.2.1.1 by replacing "two-thirds" with "one-half."
4. Revise the exceptions to Section 505.2.3 to read:
"1. In Group B, F, M and S occupancies in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, mezzanines or portions thereof are not required to be open to the room in which the mezzanines are located, provided that the occupant load of the aggregate area of the enclosed space is not greater than 10.
2. [Reserved.]
3. Mezzanines or portions thereof are not required to be open to the room in which the mezzanines are located provided that the aggregate floor area of the enclosed space is not greater than 10 percent of the allowable mezzanine area.
4. In industrial facilities, mezzanines used for control equipment are permitted to be glazed on all sides.
5. [Reserved.]
6. Mezzanines in accordance with Exception 3 to Section 505.2.1."
5. Revise Section 505.3 by replacing "stories" with "stories above grade plane."
6. Revise Section 505.3.1 by replacing "two-thirds" with "one-half."
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 17)
The provisions of Section 506 of IBC are adopted by reference with the following modifications:
1. Revise Section 506.1 and its subsections to read:
"506.1 General.
The allowable building area of a building shall be determined based on the type of construction, occupancy classification, whether there is an automatic sprinkler system installed throughout the building and the amount of building frontage on a public way or yard.
506.1.1 [Reserved.]
506.1.2 [Reserved.]
506.1.3 Basements.
Basements shall be included in building area where the total area of such basements exceeds the allowable building area for a one-story above grade plane building of the same occupancy and construction type.
506.1.3.1 Maximum area.
Every basement exceeding 40,000 square feet (3716 m2) in area shall be subdivided by fire barriers into areas not exceeding 40,000 square feet (3716 m2), provided where the building is equipped throughout with an automatic sprinkler system, the maximum undivided area may be increased to 80,000 square feet (7432 m2)."
2. Replace Table 506.2 as shown:
TABLE 506.2
ALLOWABLE AREA FACTOR (At = NS, S1, S13R, S13D or SM, as applicable) IN SQUARE FEET a, b
ALLOWABLE AREA FACTOR (At = NS, S1, S13R, S13D or SM, as applicable) IN SQUARE FEET a, b
OCCUPANCY CLASSIFICATION
|
SEE NOTES
|
CONSTRUCTION TYPE
| ||||||||
TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| ||
OCCUPANCY CLASSIFICATION
|
SEE NOTES
|
CONSTRUCTION TYPE
| ||||||||
TYPE I
|
TYPE II
|
TYPE III
|
TYPE IV
|
TYPE V
| ||||||
A
|
B
|
A
|
B
|
A
|
B
|
HT
|
A
|
B
| ||
A-1 | NS | UL | UL | 16,000 | 8,500 | 6,000 | NP | 6,000 | 3,000 | NP |
S1 | UL | UL | 64,000 | 34,000 | 24,000 | 12,000 | 24,000 | 12,000 | NP | |
SM | UL | UL | 48,000 | 25,500 | 18,000 | 9,000 | 18,000 | 9,000 | NP | |
A-2 | NS | UL | UL | 16,000 | 8,500 | 6,000 | 5,000 | 6,000 | 3,000 | NP |
S1 | UL | UL | 64,000 | 34,000 | 24,000 | 20,000 | 24,000 | 12,000 | NP | |
SM | UL | UL | 48,000 | 25,500 | 18,000 | 15,000 | 18,000 | 9,000 | NP | |
A-3 | NS | UL | UL | 16,000 | 8,500 | 6,000 | 5,000 | 6,000 | 3,000 | NP |
S1 | UL | UL | 64,000 | 34,000 | 24,000 | 20,000 | 24,000 | 12,000 | NP | |
SM | UL | UL | 48,000 | 25,500 | 18,000 | 15,000 | 18,000 | 9,000 | NP | |
A-4 | NS | UL | UL | 16,000 | 8,500 | 6,000 | 5,000 | 6,000 | 3,000 | NP |
S1 | UL | UL | 64,000 | 34,000 | 24,000 | 20,000 | 24,000 | 12,000 | NP | |
SM | UL | UL | 48,000 | 25,500 | 18,000 | 15,000 | 18,000 | 9,000 | NP | |
A-5 | NS | UL | UL | UL | UL | UL | UL | UL | UL | UL |
S1 | UL | |||||||||
SM | UL | |||||||||
B | NS | UL | UL | 20,000 | 6,000 | 10,000 | 8,000 | 10,000 | 6,000 | 4,000 |
S1 | UL | UL | UL | UL | UL | 32,000 | 40,000 | 24,000 | 16,000 | |
SM | UL | UL | 60,000 | 18,000 | 30,000 | 24,000 | 30,000 | 18,000 | NP | |
E-1 | NS | UL | UL | 16,000 | 5,000 | 8,000 | 3,000 | 10,000 | 3,000 | NP |
S1 | UL | UL | 64,000 | 20,000 | 32,000 | 12,000 | 40,000 | 12,000 | NP | |
SM | UL | UL | 48,000 | 15,000 | 24,000 | 9,000 | 30,000 | 9,000 | NP | |
E-2 | NS | UL | UL | 16,000 | 5,000 | 8,000 | 3,000 | 10,000 | 3,000 | NP |
S1 | UL | UL | 64,000 | 20,000 | 32,000 | 12,000 | 40,000 | 12,000 | NP | |
SM | UL | UL | 48,000 | 15,000 | 24,000 | 9,000 | 30,000 | 9,000 | NP | |
F-1 | NS | UL | UL | 16,000 | 4,000 | 8,000 | 4,000 | 8,000 | 5,000 | 3,000 |
S1 | UL | UL | UL | UL | 32,000 | 16,000 | 32,000 | 20,000 | 12,000 | |
SM | UL | UL | 48,000 | 12,000 | 24,000 | 12,000 | 24,000 | 15,000 | NP | |
F-2 | NS | UL | UL | 20,000 | 10,000 | 10,000 | 6,000 | 10,000 | 6,000 | 4,000 |
S1 | UL | UL | UL | UL | 40,000 | 24,000 | 40,000 | 24,000 | 16,000 | |
SM | UL | UL | 60,000 | 30,000 | 30,000 | 18,000 | 30,000 | 18,000 | NP | |
H-1 | NS c, d | 21,000 | 16,500 | 11,000 | 6,000 | 9,500 | 5,000 | 10,500 | 5,000 | NP |
S1 | 21,000 | 16,500 | 11,000 | 6,000 | 9,500 | 5,000 | 10,500 | 5,000 | NP | |
SM | NP | NP | NP | NP | NP | NP | NP | NP | NP | |
H-2 | NS c, d | 21,000 | 16,500 | 11,000 | 6,000 | 9,500 | 5,000 | 10,500 | NP | NP |
S1 | 21,000 | 16,500 | 11,000 | 6,000 | 9,500 | 5,000 | 10,500 | NP | NP | |
SM | 42,000 | 16,500 | 11,000 | NP | 9,500 | NP | NP | NP | NP | |
H-3 | NS c, d | UL | 60,000 | 20,000 | 6,000 | 10,000 | 5,000 | 10,000 | NP | NP |
S1 | UL | 60,000 | 20,000 | 6,000 | 10,000 | 5,000 | 10,000 | NP | NP | |
SM | UL | 60,000 | 20,000 | NP | 10,000 | 5,000 | 10,000 | NP | NP | |
H-4 | NS c, d | UL | UL | 20,000 | 6,000 | 10,000 | 8,000 | 10,000 | 6,000 | NP |
S1 | UL | UL | 80,000 | 24,000 | 40,000 | 32,000 | 40,000 | 24,000 | NP | |
SM | UL | UL | 60,000 | NP | 30,000 | 24,000 | 30,000 | NP | NP | |
H-5 | NS c, d | UL | UL | 16,000 | 4,000 | 8,000 | 4,000 | 8,000 | NP | NP |
S1 | UL | UL | 64,000 | 16,000 | 32,000 | 16,000 | 32,000 | NP | NP | |
SM | UL | UL | 48,000 | NP | 24,000 | 12,000 | 24,000 | NP | NP | |
I-1 | NS d, e | UL | 55,000 | 16,000 | 4,000 | 6,000 | 4,000 | 6,000 | 3,000 | NP |
S1 | UL | 220,000 | 64,000 | 16,000 | 24,000 | 16,000 | 24,000 | 12,000 | NP | |
SM | UL | 165,000 | 48,000 | 12,000 | 18,000 | 12,000 | 18,000 | 9,000 | NP | |
I-2 | NS d, f | UL | UL | 12,000 | 6,000 | 6,000 | NP | 6,000 | 3,000 | NP |
S1 | UL | UL | 48,000 | 24,000 | 24,000 | NP | 24,000 | 12,000 | NP | |
SM | UL | UL | 36,000 | NP | NP | NP | NP | 9,000 | NP | |
I-3 | NS d, e | UL | UL | 12,000 | 6,000 | 6,000 | NP | 6,000 | 3,000 | NP |
S1 | UL | UL | 48,000 | 24,000 | 24,000 | NP | 24,000 | 12,000 | NP | |
SM | UL | UL | 36,000 | NP | NP | NP | NP | 9,000 | NP | |
I-4 | NS d, g | UL | 55,000 | 16,000 | 4,000 | 6,000 | 4,000 | 6,000 | 3,000 | NP |
S1 | UL | 220,000 | 64,000 | 16,000 | 24,000 | 16,000 | 24,000 | 12,000 | NP | |
SM | UL | 165,000 | 48,000 | 12,000 | 18,000 | 12,000 | 18,000 | 9,000 | NP | |
M | NS | UL | UL | 16,000 | 6,000 | 8,000 | 6,000 | 8,000 | 5,000 | 3,000 |
S1 | UL | UL | UL | UL | UL | 24,000 | 32,000 | 20,000 | 12,000 | |
SM | UL | UL | 48,000 | 18,000 | 24,000 | 18,000 | 24,000 | 15,000 | NP | |
R-1 h | NS d | UL | UL | 24,000 | 10,000 | 10,000 | 8,000 | 10,000 | 5,000 | 3,000 |
S13R | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S1 | UL | UL | 96,000 | 40,000 | 40,000 | 32,000 | 40,000 | 20,000 | 12,000 | |
SM | UL | UL | 72,000 | 30,000 | 30,000 | 24,000 | 30,000 | 15,000 | 9,000 | |
R-2 | NS | UL | UL | 24,000 | 10,000 | 10,000 | 8,000 | 10,000 | 5,000 | 3,000 |
S13R | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S1 | UL | UL | 96,000 | 40,000 | 40,000 | 32,000 | 40,000 | 20,000 | 12,000 | |
SM | UL | UL | 72,000 | 30,000 | 30,000 | 24,000 | 30,000 | 15,000 | 9,000 | |
R-3 h | NS | UL | UL | 24,000 | 10,000 | 10,000 | 8,000 | 10,000 | 5,000 | 3,000 |
S13D | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S13R | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S1 | UL | UL | 96,000 | 40,000 | 40,000 | 32,000 | 40,000 | 20,000 | 12,000 | |
SM | UL | UL | 72,000 | 30,000 | 30,000 | 24,000 | 30,000 | 15,000 | 9,000 | |
R-4 h | NS d | UL | UL | 24,000 | 10,000 | 10,000 | 8,000 | 10,000 | 5,000 | 3,000 |
S13D | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S13R | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S1 | UL | UL | 96,000 | 40,000 | 40,000 | 32,000 | 40,000 | 20,000 | 12,000 | |
SM | UL | UL | 72,000 | 30,000 | 30,000 | 24,000 | 30,000 | 15,000 | 9,000 | |
R-5 | NS | UL | UL | 24,000 | 10,000 | 10,000 | 8,000 | 10,000 | 5,000 | 3,000 |
S13D | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S13R | UL | UL | 48,000 | 20,000 | 20,000 | 16,000 | 20,000 | 10,000 | 6,000 | |
S1 | UL | UL | 96,000 | 40,000 | 40,000 | 32,000 | 40,000 | 20,000 | 12,000 | |
SM | UL | UL | 72,000 | 30,000 | 30,000 | 24,000 | 30,000 | 15,000 | 9,000 | |
S-1 | NS | UL | 35,500 | 19,000 | 8,500 | 14,000 | 8,000 | 18,000 | 5,000 | 3,000 |
S1 | UL | UL | UL | UL | 56,000 | 32,000 | 72,000 | 20,000 | 12,000 | |
SM | UL | 106,500 | 57,000 | 25,500 | 42,000 | 24,000 | 54,000 | 15,000 | NP | |
S-2 | NS | UL | 79,000 | 28,500 | 13,000 | 21,000 | 10,000 | 27,000 | 6,000 | 4,000 i |
S1 | UL | UL | UL | UL | 84,000 | 40,000 | 108,000 | 24,000 | 16,000 i | |
SM | UL | 237,000 | 85,500 | 39,000 | 63,000 | 30,000 | 81,000 | 18,000 | NP | |
U | NS | UL | 30,000 | 16,000 | 6,000 | 8,000 | 6,000 | 8,000 | 5,000 | 1,000 |
S1 | UL | 120,000 | 64,000 | 24,000 | 32,000 | 24,000 | 32,000 | 20,000 | 4,000 | |
SM | UL | 90,000 | 48,000 | 18,000 | 24,000 | 18,000 | 24,000 | 15,000 | NP | |
For SI: 1 square foot = 0.0929 m
2.
UL = Unlimited.
NP = Not permitted.
NS = Buildings not equipped throughout with an automatic sprinkler system.
S1 = Buildings a maximum of one story above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
SM = Buildings two or more stories above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2.
S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable area factor in this table.
b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing buildings in accordance with the Chicago Building Rehabilitation Code.
e. New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies, Condition 1, see Exception 1 of Section 903.2.6.
f. New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the Chicago Fire Prevention Code.
g. New Group I-4 occupancies see Exceptions 2 and 3 of Section 903.2.6.
h. New Group R-1, R-3 and R-4 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8.
i. Type VB construction is not allowed for motor-vehicle-related occupancies other than private garages.
3. Revise Equation 5-2 by deleting the second sentence from the description of Sa.
4. Revise Section 506.2.4 to read:
"506.2.4 Mixed-occupancy, multistory buildings.
Each story of a mixed-occupancy building with more than one story above grade plane shall individually comply with the applicable requirements of Section 508.1. For buildings with more than three stories above grade plane, the building area shall be such that the aggregate sum of the ratios of the actual floor area of each story divided by the allowable area of such stories, determined in accordance with Equation 5-3 based on the applicable provisions of Section 508.1, shall not exceed three."
5. Delete the exception to Section 506.2.4.
6. Revise Section 506.3 to replace "public way" with "public way."
7. Revise Section 506.3.1 to read:
"506.3.1 Minimum percentage of perimeter.
To qualify for an area factor increase based on frontage, a building shall have not less than 25 percent of its perimeter abut a public way, court or yard. Such court or yard shall be either on the same lot or dedicated for public use and shall have direct access, not less than 20 feet (6096 mm) wide, from a public way."
8. Revise Section 506.3.2 to read:
"506.3.2 Minimum frontage distance.
To qualify for an area factor increase based on frontage, the public way, court or yard adjacent to the building perimeter shall have a minimum distance (W) of 20 feet (6096 mm) measured at right angles from the building face to any of the following:
1. The closest abutting property line.
2. The far side of a public way.
3. The exterior face of an adjacent building on the same lot.
4. The opposite side of a court.
Where the value of W is greater than 30 feet (9144 mm), a value of 30 feet (9144 mm) shall be used in calculating the area factor increase based on frontage, regardless of the actual width of the public way, court or yard. Where the value of W varies along the perimeter of the building, the calculation performed in accordance with Equation 5-5 shall be based on the weighted average calculated in accordance with Equation 5-4."
9. Revise the definitions of values for Equation 5-4 by replacing "public way or open space" with "public way, court or yard" and inserting "but not greater than 30 feet (9144 mm)" at the end of the definition of Wn
.
10. Delete the exception to Section 506.3.2.
11. Revise Equation 5-5 to read:
"If = (F/P)(W/30)(S) (Equation 5-5)
where:
If = Area factor increase due to frontage.
F = Building perimeter that fronts on a public way or yard having a minimum width of 20 feet (6096 mm) (feet).
P = Perimeter of entire building (feet).
W = Width of public way or yard (feet) in accordance with Section 506.3.2.
S = Where building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, S = 2; where building is not equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2, S = 1.
(Amend Coun. J. 7-24-19, p. 3646, § 30; Amend Coun. J. 10-7-20, p. 21791, Art. II, § 7; Amend Coun. J. 6-25-21, p. 32180, Art. II, § 6)
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