ADDITIONS

Municipal Code of Chicago tit. 14R, ch. 14R-11

in effect

Municipal Code of Chicago § 14R-11-1101 General.

14R-11-1101 General. The provisions of Section 1101 of IEBC are adopted by reference with the following modifications: 1. Revise Section 1101.1 to read: "1101.1 Scope. An addition to an existing building and the facilities and systems serving the addition shall comply with the Chicago Construction Codes as adopted for new construction without requiring the existing building to comply with any requirements of those codes or of these provisions, except as required by this chapter." 2. Revise Section 1101.2 to read: "1101.2 Creation or extension of nonconformity. An addition shall not create or extend any nonconformity in the existing building to which the addition is being made with regard to accessibility, structural strength, fire safety, means of egress, natural light and ventilation, or the capacity of mechanical, plumbing or electrical systems." 3. Revise Section 1101.3 to read: "1101.3 Other work. Any repair or alteration work within an existing building to which an addition is being made shall comply with the applicable requirements for the work as classified in Chapters 4 and 6."

Municipal Code of Chicago § 14R-11-1102 Heights and areas.

14R-11-1102 Heights and areas. The provisions of Section 1102 of IEBC are adopted by reference with the following modifications: 1. Revise Section 1102.1 to read: "1102.1 Height limitations. An addition shall not increase the building height and number of stories above grade plane of an existing building beyond those allowed under the applicable provisions of Chapter 5 of the Chicago Building Code for new buildings." 2. Revise Section 1102.2 to read: "1102.2 Area limitations. An addition shall not increase the building area of an existing building beyond that allowed under the applicable provisions of Chapter 5 of the Chicago Building Code for new buildings. Exceptions: 1. In-filling of existing floor openings and construction of mezzanines or lofts shall be allowed regardless of building area limitations. 2. Adding nonoccupiable appendages, such as elevator and exit stairway shafts, shall be allowed beyond the building area allowed by the Chicago Building Code." 3. Revise Section 1102.3 to read: "1102.3 Fire protection systems. Existing fire areas increased in floor area or volume by the addition shall comply with Chapter 9 of the Chicago Building Code." (Amend Coun. J. 2-19-20, p. 14473, Art. IV, § 22)

Municipal Code of Chicago § 14R-11-1103 Structural.

14R-11-1103 Structural. The provisions of Section 1103 of IEBC are adopted by reference with the following modifications: 1. Revise the exception to Section 1103.1 to read: "Exception: Buildings of Group R-5 occupancy where the existing building and the addition together comply with the conventional light frame construction methods of the Chicago Building Code." 2. Revise Section 1103.2 to read: "1103.2 Lateral force-resisting system. Where the addition is structurally independent of the existing building, existing lateral load-carrying structural elements shall be allowed to remain unaltered. Where the addition is not structurally independent of the existing building, the existing building and its addition acting together as a single structure shall meet the requirements of Sections 1609 and 1613 of the Chicago Building Code using full seismic forces. Exceptions: 1. Buildings of Group R-5 occupancy where the existing building and the addition comply with the conventional light-frame construction methods of the Chicago Building Code. 2. Any existing lateral load-carrying structural element whose demand-capacity ratio with the addition considered is not more than 10 percent greater than its demand-capacity ratio with the addition ignored shall be allowed to remain unaltered. For purposes of calculating demand- capacity ratios, the demand shall consider applicable load combinations with design lateral loads or forces in accordance with Sections 1609 and 1613 of the Chicago Building Code. For purposes of this exception, comparisons of demand-capacity ratios and calculation of design lateral loads, forces and capacities shall account for the cumulative effects of additions and alterations since original construction." 3. Delete Section 1103.3.

Municipal Code of Chicago § 14R-11-1104 Smoke alarms in occupancy Groups R and I-1.

14R-11-1104 Smoke alarms in occupancy Groups R and I-1. The provisions of Section 1104 of IEBC are adopted by reference with the following modification: 1. Revise Section 1104.1 to read: "1104.1 Smoke alarms in existing portions of a building. Where an addition is made to a building or structure of a Group R or I-1 occupancy, the existing building shall be provided with smoke alarms as required by Section 504.8 of the Chicago Minimum Requirements for Existing Buildings."

Municipal Code of Chicago § 14R-11-1105 Carbon monoxide alarms in Groups E, I-1, I-2, I-4 and R.

14R-11-1105 Carbon monoxide alarms in Groups E, I-1, I-2, I-4 and R. The provisions of Section 1105 of IEBC are adopted by reference with the following modifications: 1. Revise Section 1105.1 to read: "1105.1 Carbon monoxide alarms in existing portions of a building. Where an addition is made to a building or structure of a Group E, I-1, I-2, I-4 or R occupancy, the existing building shall be equipped with carbon monoxide alarms in accordance with Section 504.9 of the Chicago Minimum Requirements for Existing Buildings." (Amend Coun. J. 2-19-20, p. 14473, Art. IV, § 23)

Municipal Code of Chicago § 14R-11-1106 IEBC Section 1106.

14R-11-1106 IEBC Section 1106. The provisions of Section 1106 of IEBC are not adopted.

Municipal Code of Chicago § 14R-11-1107 Energy conservation.

14R-11-1107 Energy conservation. The provisions of Section 1107 of IEBC are adopted by reference with the following modifications: 1. Revise Section 1107.1 to read: "1107.1 Minimum requirements. Additions to existing buildings shall conform to the energy requirements of the Chicago Energy Conservation Code as they relate to new construction."

Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2674804Fetched: 10/24/2026