Heads up: There are no amended sections in this chapter.

14R-11-1101 The provisions of Section 1101 of IEBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

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.
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.
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.

14R-11-1102 The provisions of Section 1102 of IEBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

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.

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.
Existing fire areas increased in floor area or volume by the addition shall comply with Chapter 9 of the Chicago Building Code.

14R-11-1103 The provisions of Section 1103 of IEBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Any existing gravity load-carrying structural element for which an addition and its related alterations cause an increase in design dead, live or snow load, including snow drift effects, of more than 5 percent shall be replaced or altered as needed to carry the gravity loads required by the Chicago Building Code for new structures. Any existing gravity load-carrying structural element whose gravity load-carrying capacity is decreased as part of the addition and its related alterations shall be considered to be an altered element subject to the requirements of Section 806.2. Any existing element that will form part of the lateral load path for any part of the addition shall be considered to be an existing lateral load-carrying structural element subject to the requirements of Section 1103.3.

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.

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.

14R-11-1104 The provisions of Section 1104 of IEBC are adopted by reference with the following modification:

Added Coun. J. 4-10-19, p. 100029.

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.

14R-11-1105 The provisions of Section 1105 of IEBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

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.

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

Added Coun. J. 4-10-19, p. 100029.

14R-11-1107 The provisions of Section 1107 of IEBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Additions to existing buildings shall conform to the energy requirements of the Chicago Energy Conservation Code as they relate to new construction.
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