PROVISIONS FOR ALL COMPLIANCE METHODS

Municipal Code of Chicago tit. 14R, ch. 14R-3

in effect

Municipal Code of Chicago § 14R-3-300 Defined terms.

14R-3-300 Defined terms. Where provisions of Chapter 3 of IEBC are adopted by reference, the following terms shall be reset in italic type: "accessible"; "Accessible unit"; "accessible means of egress"; "accessible route"; "change of occupancy" and "changes of occupancy"; "dwelling unit"; "sleeping unit"; "Type A unit"; and "Type B unit."

Municipal Code of Chicago § 14R-3-301 Administration.

14R-3-301 Administration. The provisions of Section 301 of IEBC are adopted by reference with the following modifications: 1. Revise Section 301.3 to read: "301.3 Alteration, addition or change of occupancy. The alteration, addition or change of occupancy of all existing buildings shall comply with one of the methods listed in Section 301.3.1, 301.3.2 or 301.3.3 as selected by the applicant. Sections 301.3.1 through 301.3.3 shall not be applied in combination with each other. 301.3.1 Prescriptive compliance method. Alterations, additions and changes of occupancy complying with Chapter 5 shall be considered in compliance with the provisions of this code. 301.3.2 Work area compliance method. Alterations, additions and changes of occupancy complying with the applicable requirements of Chapters 6 through 12 shall be considered in compliance with the provisions of this code. 301.3.3 Performance compliance method. Alterations, additions and changes of occupancy complying with Chapter 13 shall be considered in compliance with the provisions of this code." 2. Revise Section 301.5 to read: "301.5 Compliance with accessibility. Accessibility requirements for existing buildings shall comply with ICC A117.1 as modified by Chapter 11 of the Chicago Building Code."

Municipal Code of Chicago § 14R-3-302 General provisions.

14R-3-302 General provisions. The provisions of Section 302 of IEBC are adopted by reference with the following modifications: 1. Revise Section 302.2 to read: "302.2 Dangerous or unsafe conditions. The building official shall require the elimination of dangerous conditions. The building official shall have the authority to require the elimination or abatement of unsafe conditions." 1.1 Revise Section 302.3 by deleting "International Private Sewage Disposal Code," and "International Residential Code." 1.2. Insert a new Section 302.3.1 to read: "302.3.1. Minimum requirements. Existing buildings undergoing repair, alteration, change of occupancy, addition or relocation shall also comply with the Chicago Minimum Requirements for Existing Buildings." 2. Revise Section 302.4 to read: "302.4 Existing materials. Materials already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be allowed to remain in use unless determined by the building official to be hazardous." 3. Revise Section 302.5 to read: "302.5 New and replacement materials. Except as otherwise required or allowed by this code, materials allowed by the applicable code for new construction shall be used. Like materials shall be allowed for repairs and alterations, provided that unsafe conditions are not created. Hazardous materials shall not be used where the code for new construction would not allow their use in buildings of similar occupancy, purpose and location." 4. Revise Section 302.5.1 to read: "302.5.1 New structural members and connections. New structural members and connections shall comply with the material and detailing provisions of the Chicago Building Code for new buildings of similar structure, purpose and location. Exception: Where alternative design criteria are specifically approved by the building official." (Amend Coun. J. 2-19-20, p. 14473, Art. IV, § 3; Amend Coun. J. 10-7-20, p. 21791, Art. IV, § 2)

Municipal Code of Chicago § 14R-3-303 Structural design loads and evaluation and design procedures.

14R-3-303 Structural design loads and evaluation and design procedures. The provisions of Section 303 of IEBC are adopted by reference with the following modifications: 1. Revise Section 303.1 to read: "303.1 Live loads. Where an addition or alteration does not result in increased design live load, existing gravity load carrying structural elements shall be allowed to be evaluated and designed for live loads approved by the building official that are less than those required by Section 1607 of the Chicago Building Code. Any area approved for a reduced live load shall be posted with permanent placards indicating the approved live load. Where the addition or alteration results in increased design live load, the live load required by Section 1607 of the Chicago Building Code shall be used." 2. Revise Table 303.3.1 by replacing "IBC" with "CBC." 3. Revise Table 303.3.2 by replacing "IBC" with "CBC." 4. Revise Section 303.3.2 to read: "303.3.2 Compliance with reduced seismic forces. Where seismic evaluation and design is allowed to use reduced seismic forces, the criteria used shall be in accordance with one of the following: 1. The Chicago Building Code using 75 percent of the prescribed forces. Values of R, 0 and Cd used for analysis shall be as specified in Section 303.3.1 of this code. 2. [Reserved.] 3. ASCE 41, using the performance objective in Table 303.3.2 for the applicable risk category." (Amend Coun. J. 7-24-19, p. 3646, § 40; Amend Coun. J. 2-19-20, p. 14473, Art. IV, § 4)

Municipal Code of Chicago § 14R-3-304 In-situ load tests.

14R-3-304 In-situ load tests. The provisions of Section 304 of IEBC are adopted by reference without modification.

Municipal Code of Chicago § 14R-3-305 Accessibility for existing buildings.

14R-3-305 Accessibility for existing buildings. The provisions of Section 305 of IEBC are adopted by reference with the following modifications: 1. Throughout Section 305, italicize the terms "accessible," "accessible means of egress," "accessible route," and "Type B unit". 2. Revise Section 305.1 by adding exceptions to read: "Exceptions: 1. Group R-5 occupancies that are not undergoing a change of occupancy. 2. Occupancies that are undergoing a change of occupancy to Group R-5." 3. Add a new Section 305.2.1 to read: "305.2.1 Repairs. Repair of an existing facility shall not decrease the level of accessibility that existed before the repair was undertaken." 4. Revise Section 305.3 by adding an exception to read: "Exception: Alterations to individually-owned Accessible units or Type A units within a Group R-2 occupancy shall be allowed to meet the requirements for Type B units." 5. Revise Section 305.4 to read: "305.4 Change of occupancy. Existing buildings that undergo a change of occupancy shall comply with this section. Exception: Type B units required by Section 1107 of the Chicago Building Code are not required to be provided in existing buildings and facilities built for first occupancy before March 14, 1991, undergoing a change of occupancy." 6. Revise the last sentence of Section 305.4.2 to read: "Where it is technically infeasible to comply with the new construction standards for any of these requirements for a change of occupancy, Items 1 through 6 shall conform to the requirements to the maximum extent technically feasible." 7. Add a new Section 305.4.3 to read: "305.4.3 Change of occupancy to residential occupancy. Unless technically infeasible, provisions for new construction shall apply to portions of existing buildings that are altered concurrently with a change of occupancy to a Group R-4 occupancy or a Group R-1 or R-2 occupancy containing more than 20 dwelling units or sleeping units." 8. Revise Section 305.5 by adding a sentence at the end to read: "Additions to an existing building shall provide entry from the existing building at all common levels without necessitating leaving and re-entering the building from the outside." 9. Add a new Section 305.5.1 to read: "305.5.1 Toilet and bathing facilities. If there are no toilet rooms, bathing facilities or shower rooms in the addition and these facilities are provided in the existing building, then at least one toilet room, one bathing facility and one shower room for each sex, or one unisex toilet room or bathing facility, shall be accessible." 10. Revise exceptions 3 through 5 to Section 305.6 to read: "3. Accessible units and Type A units required in Group R-2, R-3 and R-4 occupancies by Section 1107 of the Chicago Building Code are not required to be provided in existing buildings and facilities undergoing alterations where there is no change of occupancy. 4. Type B units required by Section 1107 of the Chicago Building Code are not required to be provided in existing buildings and facilities built for first occupancy before March 14, 1991, undergoing alterations or change of occupancy. 5. Type C units shall not be required in existing buildings and facilities undergoing alterations or change of occupancy." 11. Revise exception 5 to Section 305.7 to read: "5. This provision does not apply where alterations are limited to dwelling units or sleeping units other than Accessible units or Type A units and means of egress serving such units." 12. Revise Section 305.8.3 to read: "305.8.3 Platform lifts. Platform (wheelchair) lifts complying with ICC A117.1 and installed in accordance with the Chicago Conveyance Device Code shall be allowed as a component of an accessible route." 13. Revise Sections 305.8.6 through 305.8.10 to read: "305.8.6 Accessible dwelling or sleeping units. Where Group I-1, I-2, I-3, R-1, R-2, R-3 or R-4 dwelling units or sleeping units are being altered or added, the requirements of Section 1107 of the Chicago Building Code for Accessible units apply only to the quantity of units being altered or added. 305.8.7 Type A dwelling or sleeping units. Where more than 20 Group R-2 dwelling units or sleeping units are being altered or added, the requirements of Section 1107 of the Chicago Building Code for Type A units apply only to the quantity of units being added. 305.8.8 Type B dwelling or sleeping units. Where four or more Group I-1, I-2, R-1, R-2, R-3 or R-4 dwelling units or sleeping units are being added, the requirements of Section 1107 of the Chicago Building Code for Type B units apply only to the quantity of units being added. 305.8.9 Jury boxes and witness stands. In alterations, accessible wheelchair spaces are not required to be located within the defined area of raised jury boxes or witness stands and shall be allowed to be located outside these spaces where the ramp or lift access restricts or projects into the required means of egress. 305.8.10 Toilet rooms. Where it is technically infeasible to alter existing toilet and bathing rooms to be accessible, an accessible family or assisted-use toilet or bathing room constructed in accordance with Section 1109.2.1 of the Chicago Building Code is allowed. The family or assisted-use toilet or bathing room shall be located on the same floor and in the same area as the existing toilet or bathing rooms. At the inaccessible toilet and bathing rooms, directional signs indicating the location of the nearest family or assisted-use toilet room or bathing room shall be provided. These directional signs shall include the International Symbol of Accessibility and sign characters shall meet the visual character requirements in accordance with ICC A117.1." 14. Revise Section 305.8.13 to read: "305.8.13 Fuel dispensers. Operable parts of replacement fuel dispensers shall be allowed to be 54 inches (1370 mm) maximum, measuring from the surface of the vehicular way where fuel dispensers are installed on existing curbs." 15. Add a new section 305.8.16 to read: "305.8.16 Parking areas. All changes, improvements or maintenance of existing parking areas, including sealcoating, resurfacing, remarking, fencing, curbs, walks or landscaping, shall provide accessible parking spaces in accordance with Section 1106 of the Chicago Building Code. In addition, an accessible route shall be provided within the parking area to connect the accessible parking spaces to a path of travel that leads to an accessible entrance. The accessible route shall include the connection from the parking area that leads to the accessible entrance." 16. Add a new Section 305.8.17 to read: "305.8.17. Group I-3. In Group I-3 occupancies, at least 3 percent of sleeping units being altered shall comply with Section 1107.5.5 of the Chicago Building Code until 3 percent of total sleeping units in the facility are accessible. Where alterations are made to specific sleeping units, the required number of accessible sleeping units shall be permitted to be provided in sleeping units other than those where alterations are originally planned, provided that each substitute sleeping unit meets all of the following criteria: 1. Is located on the same site. 2. Is integrated with other sleeping units to the maximum extent feasible. 3. Has, at a minimum, equal physical access as the other altered sleeping units to areas used by detainees for visitation, dining, recreation, educational programs, medical services, work programs, religious services, and participation in other programs that the facility offers to detainees. 4. If it is technically infeasible to locate a substitute sleeping unit on the same site, the substitute sleeping unit must be provided at another site within the same correctional system." 17. Revise Section 305.9 and its subsections to read: "305.9 Historic buildings. These provisions shall apply to facilities designated as historic buildings that undergo alterations or a change of occupancy, unless technically infeasible. Where compliance with the requirements for accessible routes, entrances or toilet rooms would threaten or destroy the historic significance of the facility, as determined by the Illinois Historic Preservation Agency in accordance with Section 202.5.1 of the Illinois Accessibility Code, the alternative requirements of Section 202.5 of the Illinois Accessibility Code for that element shall be permitted." (Amend Coun. J. 7-24-19, p. 3646, § 41; Amend Coun. J. 2-19-20, p. 14473, Art. IV, § 5; Amend Coun. J. 10-7-20, p. 21791, Art. IV, § 3; Amend Coun. J. 6-25-21, p. 32180, Art. III, § 1)

Municipal Code of Chicago § 14R-3-306 Reroofing.

14R-3-306 Reroofing. The following language shall be inserted as a new Section 306: "306 REROOFING 306.1 General. Materials and methods of application used for roof recover and roof replacement shall comply with the requirements of Chapter 15 of the Chicago Building Code. Roof repair not exceeding 25 percent of the surface area of an existing roof may comply with Chapter 4 of this code. Exceptions: 1. Roof replacement or roof recover of existing low-sloped roofs shall not be required to meet the minimum design slope requirement of one-quarter unit vertical in 12 units horizontal (2-percent slope) in Section 1507 of the Chicago Building Code for roofs that provide positive roof drainage. 2. Roof replacement or roof recover of existing low-sloped roofs shall comply with the roof insulation requirements for new construction unless the installation of additional insulation above the structural roof deck is infeasible due to the height of existing parapets, equipment curbs, skylight curbs, window sills, door thresholds, and similar elements with flashing into the roof system. In no case shall a roof replacement or roof recover reduce the insulating value of the roof. 3. Recovering or replacing an existing roof covering shall not be required to meet the requirement for secondary (emergency overflow) drains or scuppers in Section 1502 of the Chicago Building Code for roofs that provide for positive roof drainage. For the purposes of this exception, existing secondary drainage or scupper systems required in accordance with this code shall not be removed unless they are replaced by secondary drains or scuppers designed and installed in accordance with Section 1502 of the Chicago Building Code. 306.2 Structural requirements. Reroofing shall comply with the requirements of Section 706. Exception: For roof repair not exceeding 25 percent of the surface area of an existing roof, structural roof components shall be capable of supporting the roof-covering system and the material and equipment loads that will be encountered during installation of the system. 306.3 Roof replacement. Roof replacement shall include the removal of all existing layers of roof coverings down to the roof deck. Exception: Where the existing roof assembly includes an ice barrier membrane that is adhered to the roof deck, the existing ice barrier membrane shall be allowed to remain in place and be covered with an additional layer of ice barrier membrane in accordance with Section 1507 of the Chicago Building Code. 306.3.1 Roof recover. The installation of a new roof covering over an existing roof covering shall be allowed where any of the following conditions occur: 1. The new roof covering is installed in accordance with the roof covering manufacturer’s instructions. 2. Complete and separate roofing systems, such as standing-seam metal roof panel systems, that are designed to transmit the roof loads directly to the building’s structural system and that do not rely on existing roofs and roof coverings for support, are installed. 3. Metal panel, metal shingle and concrete and clay tile roof coverings are installed over existing wood shake roofs in accordance with Section 306.4. 4. A new protective roof coating is applied over an existing protective roof coating, a metal roof panel, metal roof shingles, mineral-surfaced roll roofing, a built-up roof, modified bitumen roofing, thermoset and thermoplastic single-ply roofing or a spray polyurethane foam roofing system. Exception: A roof recover shall not be allowed where any of the following conditions occur: 1. The existing roof or roof covering is water soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing. 2. The existing roof covering is slate, clay, cement or asbestos-cement tile. 3. The existing roof has two or more applications of any type of roof covering unless approved based on a condition report complying with Section 104 of the Chicago Minimum Requirements for Existing Buildings that establishes the capacity of the roof structure to support additional weight. 306.4 Roof recovering. Where the application of a new roof covering over wood shingle or shake roofs creates a combustible concealed space, the entire existing surface shall be covered with gypsum board, mineral fiber, glass fiber or other approved materials securely fastened in place. 306.5 Reinstallation of materials. Existing slate, clay or cement tile shall be allowed for reinstallation, except that damaged, cracked or broken slate or tile shall not be reinstalled. Existing vent flashing, metal edgings, drain outlets, collars and metal counterflashings shall not be reinstalled where rusted, damaged or deteriorated. Aggregate surfacing materials shall not be reinstalled. 306.6 Flashings. Flashings shall be reconstructed in accordance with manufacturer’s installation instructions. Metal flashing to which bituminous materials are to be adhered shall be primed prior to installation. 306.7 Roof edges adjoining shafts and fully enclosed courts. When roof replacement is performed, the edges of a low-sloped roof that adjoin a shaft or a court that is enclosed on all sides shall be made to comply with Section 1516.2 of the Chicago Building Code. 306.8 Skylights and other openings. When roof replacement is performed, all skylights and other openings located in the plane of a low-sloped roof that are not otherwise required to remain open and unobstructed by law shall be made to comply with Section 1516.3 of the Chicago Building Code.” (Amend Coun. J. 10-9-24, p. 18818, § 2)

Municipal Code of Chicago § 14R-3-307 Fire escapes.

14R-3-307 Fire escapes. The following language shall be inserted as a new Section 307: "307. FIRE ESCAPES 307.1 Where allowed. Fire escapes shall be allowed only as provided for in Sections 307.1.1 through 307.1.4. 307.1.1 New buildings. Fire escapes shall not constitute any part of the required means of egress in new buildings. 307.1.2 Existing fire escapes. Existing fire escapes shall continue to be accepted as a component in the means of egress in existing buildings only. 307.1.3 New fire escapes. New fire escapes for existing buildings may be approved by the building official only where interior or exterior stairways cannot be utilized because of property lines limiting stairway size or because of sidewalks, alleys or roads at grade level. New fire escapes shall not incorporate ladders or access by windows. 307.1.4 Limitations. Fire escapes shall comply with this section and shall not constitute more than 50 percent of the required number of exits nor more than 50 percent of the required exit capacity. 307.2 Location. Where located on the front of the building and where projecting beyond the property line, the lowest landing shall be not less than 12 feet (3658 mm) or more than 14 feet (4267 mm) above grade, and shall be equipped with a counterbalanced stairway to the street. In alleyways and thoroughfares less than 30 feet (9144 mm) wide, the clearance under the lowest landing shall be not less than 14 feet (4267 mm). 307.3 Construction. The fire escape shall be designed to support a live load of 100 pounds per square foot (4788 Pa) and shall be constructed of steel or other noncombustible materials. Walkways and railings located over or supported by combustible roofs in buildings of Type III and IV construction are allowed to be of wood not less than nominal 2 inches (51 mm) thick. Stair treads and landings shall be so constructed as to prevent accumulation of snow or ice, but the maximum dimension of any opening, through such treads, landings or floors shall not exceed 1 1/4 inches (32 mm). 307.4 Dimensions. Stairways shall be not less than 24 inches (610 mm) wide with risers not more than, and treads not less than, 8 inches (203 mm) and landings at the foot of stairways not less than 40 inches (1016 mm) wide by 36 inches (914 mm) long, located not more than 8 inches (203 mm) below the door. Guards not less than 36 inches (914 mm) in height shall be provided at the open sides of fire escape stairways and landings. 307.5 Opening protectives. Doors and windows within 10 feet (3048 mm) of fire escape stairways shall be protected with 3/4-hour opening protectives. Exception: Opening protection shall not be required in buildings equipped throughout with an automatic sprinkler system. 307.6 Removal of existing fire escapes. Existing fire escapes shall not be removed unless approved by the building official and fire code official based on a showing that the means of egress remaining after removal of the fire escape will substantially comply with the requirements for number, width, location, access to and enclosure of means of egress in new buildings provided in Chapter 10 of the Chicago Building Code."

Municipal Code of Chicago § 14R-3-308 Electrical.

14R-3-308 Electrical. The following language shall be inserted as a new Section 308: "308. ELECTRICAL 308.1 Special occupancies. Where the use of an existing building or part of an existing building is changed to one of the following special occupancies as described in the Chicago Electrical Code, the electrical wiring and equipment of the building or portion thereof that contains the special occupancy shall comply with the applicable requirements of the Chicago Electrical Code: 1. Hazardous locations. 2. Commercial garages, repair garages and storage garages. 3. Aircraft hangars. 4. Gasoline dispensing and service stations. 5. Bulk storage plants. 6. Spray application, dipping and coating processes. 7. Health care facilities. 8. Places of assembly. 9. Theaters, audience areas of motion picture and television studios, and similar locations. 10. Motion picture and television studios and similar locations. 11. Motion picture projectors. 12. Agricultural buildings."

Municipal Code of Chicago § 14R-3-309 Residential occupancies.

14R-3-309 Residential occupancies. The following language shall be inserted as a new Section 309: "309. RESIDENTIAL OCCUPANCIES 309.1 Increase in number of dwelling units or sleeping units. Where the number of dwelling units or sleeping units within a fire area in a building containing an existing Group R occupancy is increased, the building shall comply with Section 309.1.1 or 309.1.2, as applicable. Any increase in the number of existing dwelling units or sleeping units shall also comply with the Chicago Zoning Ordinance. 309.1.1 One additional unit. Where alterations will increase the number of existing dwelling units or sleeping units by no more than one, the newly-created unit shall not be required to comply with all requirements for new construction provided the following conditions are met: 1. The building shall not exceed the maximum number of stories above grade plane based on construction type in Table 309.1.1. Buildings of mixed construction shall be governed by the requirements of the least fire-resistive construction type. 2. Where the new unit is in a basement, the basement walls shall be impervious to leakage of underground and surface runoff water and shall be protected against dampness. 3. The dimensions of rooms in the new unit shall comply with Section 1207 of the Chicago Building Code. 4. The new unit shall be provided with natural light and natural ventilation as required by Sections 1202 and 1204 of the Chicago Building Code. 5. The new unit shall have at least the number of exits or exit access doorways required by Section 1006 of the Chicago Building Code. A second means of egress may pass through a room or space containing a heating plant. 6. The floor-ceiling assembly between the new unit and an existing unit shall have a fire-resistance rating of not less than 30 minutes or be original lath and plaster construction. 7. Walls between the new unit and an existing unit or between the new unit and a corridor or exit stairway shall have a fire-resistance rating of not less than 30 minutes or be original lath and plaster construction. 8. The unit shall be separated from incidental uses adjacent to the unit in accordance with Section 509.1 of the Chicago Building Code. If the number of existing dwelling units or sleeping units in a building has previously been increased in accordance with this section or prior Sections 78.1-22 or 13-200-230 of the Municipal Code, the building and every additional dwelling unit or sleeping unit shall comply with Section 309.1.2. TABLE 309.1.1 MAXIMUM NUMBER OF STORIES ABOVE GRADE PLANE CONSTRUCTION TYPE | STORIES ABOVE GRADE PLANE CONSTRUCTION TYPE | STORIES ABOVE GRADE PLANE IA | UL IB | 11 a IIA, IIIA or IV | 4 a IIIB | 3 VA | 3 a VB | 2 IIB | 1 a a. One additional story is allowed in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 of the Chicago Building Code. 309.1.2 Two or more additional units. Where alterations will increase the number of existing dwelling units or sleeping units by two or more, the newly-created units shall not be required to comply with all requirements for new construction provided the following conditions are met: 1. Conditions 1-8 in Section 309.1.1 shall be met. 2. Interior exit stairways shall be enclosed with assemblies having a fire-resistance rating of not less than 2 hours and opening protectives in accordance with the Chicago Building Code. Existing assemblies may be of combustible construction so long as the required rating is provided. Exception: In existing buildings up to 3 stories above grade plane, exit stairways shall be enclosed with assemblies having a fire-resistance rating of not less than 1 hour and existing 1-3/4 inch (44 mm) thick solid-core wood doors with 1-3/4 inch (44 mm) rabbeted frames or opening protectives in accordance with the Chicago Building Code. 3. Assemblies separating existing units from corridors shall have a fire-resistance rating of not less than 30 minutes. 4. Assemblies separating the new units from existing units and corridors shall have a fire-resistance rating of not less than 1 hour. 5. Doors between corridors and new and existing dwelling units and sleeping units shall be existing 1-3/4 inch (44 mm) thick solid-core wood doors with 1-3/4 inch (44 mm) rabbeted frames, existing doors tested to establish a fire-resistance rating of not less than 20 minutes or new doors in accordance with the Chicago Building Code. 6. Doors to exit stairways and doors between corridors and new and existing dwelling units and sleeping units shall be self-closing. 7. Incidental uses shall be enclosed in accordance with Section 509.1 of the Chicago Building Code. 8. Basement ceiling construction shall comply with Section 605.4 of the Chicago Building Code. 309.2 Alteration for use as congregate living facilities. Where an existing Group R occupancy, not previously used as congregate living facilities, is subject to alterations for use as congregate living facilities, the building shall be equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 of the Chicago Building Code. Exception: Congregate living facilities with three or fewer sleeping units. 309.3 Openings for natural light and ventilation in pre-1958 buildings. In Group R occupancies constructed before January 1, 1958, for openings in original exterior walls, the minimum dimension of yards and courts perpendicular to the openings shall be allowed to be 6 inches (152 mm) less than required by Section 1205 of the Chicago Building Code." (Amend Coun. J. 2-19-20, p. 14473, Art. IV, § 6)

Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2673829Fetched: 10/24/2026