ADOPTS WITH AMENDMENTS:

International Existing Building Code 2018 (IEBC 2018)

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

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

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

The provisions of this chapter shall apply where a change of occupancy occurs.

Exception: Where an existing Group R occupancy is changed to a different Group R occupancy classification solely due to an increase in the number of dwelling units or sleeping units, the change of occupancy shall be governed by Sections 309.1 and 309.2.

A change of occupancy shall not be made to any existing building without first obtaining a permit from the building official.

Where a change of occupancy involves creating an incidental use listed in Table 509 of the Chicago Building Code or one of the following special uses or occupancies described in Chapter 4 of the Chicago Building Code, the incidental use or special use or occupancy shall comply with all of the applicable requirements of the Chicago Building Code:

  1. Motor vehicle-related occupancies.
  2. Group I-2 occupancies.
  3. Motion picture projection rooms.
  4. Stages, platforms and technical production areas.
  5. Special amusement buildings.
  6. Aircraft-related occupancies.
  7. Combustible storage.
  8. Hazardous materials.
  9. Spray application of flammable finishes.
  10. Drying rooms.
  11. Organic coatings.
  12. Hydrogen fuel gas rooms.
  13. Ambulatory care facilities.
  14. Hyperbaric facilities.
  15. Combustible dusts, grain processing and storage.
  16. Medical gas systems.
  17. Higher education laboratories.

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

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

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

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

Structural elements carrying tributary live loads from an area with a change of occupancy shall satisfy the requirements of Section 1607 of the Chicago Building Code. Design live loads for areas of new occupancy shall be based on Section 1607 of the Chicago Building Code.

Exception: Structural elements whose demand-capacity ratio considering the change of occupancy is not more than 5 percent greater than the previous demand-capacity ratio.

Where a change of occupancy results in a structure being assigned to a higher risk category, the structure shall satisfy the requirements of Sections 1608 and 1609 of the Chicago Building Code for the new risk category.

Exception: Where the floor area of the change of occupancy is less than 10 percent of the building area. The cumulative effect of occupancy changes over time shall be considered.

Where a change of occupancy results in a structure being assigned to Risk Category IV, the structure shall satisfy the requirements of Section 1613 of the Chicago Building Code for the new risk category using full seismic forces.
Any structure that provides operational access to an adjacent structure assigned to Risk Category IV as the result of a change of occupancy shall itself satisfy the requirements of Sections 1608, 1609 and 1613 of the Chicago Building Code. For compliance with Section 1613, the full seismic forces shall be used. Where operational access to Risk Category IV structure is less than 10 feet (3048 mm) from either an abutting property line or from another structure, access protection from potential falling debris shall be provided.

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

Where the occupancy of an existing building or part of an existing building is changed, all unsafe conditions shall be corrected without requiring that all parts of the electrical system comply with Chicago Electrical Code for new construction.
Where the occupancy of an existing building or part of an existing building is changed, electrical service shall be upgraded to meet the requirements of Chicago Electrical Code for the new occupancy.
Where the occupancy of an existing building or part of an existing building is changed, the number of electrical outlets shall comply with Chicago Electrical Code for the new occupancy.

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

Where the occupancy of an existing building or part of an existing building is changed such that the new occupancy is subject to different kitchen exhaust requirements or to increased mechanical ventilation requirements in accordance with the Chicago Mechanical Code, the new occupancy shall comply with the respective Chicago Mechanical Code provisions.

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

Where the occupancy of an existing building or part of an existing building is changed such that the new occupancy is subject to increased or different plumbing fixture requirements or to increased water supply requirements in accordance with the Chicago Plumbing Code, the new occupancy shall comply with the intent of the respective Chicago Plumbing Code provisions.
If the new occupancy is a food-handling establishment, all existing sanitary waste lines above the food or drink preparation or storage areas shall be panned or otherwise protected to prevent leaking pipes or condensation on pipes from contaminating food or drink. New drainage lines shall not be installed above such areas and shall be protected in accordance with the Chicago Plumbing Code.
If the new occupancy will produce grease or oil-laden wastes or other byproducts that require an interceptor, interceptors shall be provided as required in the Chicago Plumbing Code.

If the new occupancy will produce chemical wastes, the following shall apply:

  1. If the existing piping is not compatible with the chemical waste, the waste shall be neutralized prior to entering the drainage system, or the piping shall be changed to a compatible material.
  2. Chemical waste shall not discharge to a public sewer system without the approval of the Department of Water Management.
If the occupancy group is changed to Group I-2, the plumbing system shall comply with the applicable requirements of the Chicago Plumbing Code.

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

Light and ventilation shall comply with the requirements of the Chicago Building Code for the new occupancy.

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

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

Amended Coun. J. 10-7-20, p. 21791.

The provisions of this section shall apply to buildings or portions thereof undergoing a change of occupancy. Such buildings shall also comply with Sections 1002 through 1010 of this code. The application of requirements for the change of occupancy shall be as set forth in Sections 1011.1.1 through 1011.1.3.
The requirements of Chapter 9 shall be applicable throughout the existing building for the new occupancy classification based on the separation conditions set forth in Sections 1011.1.1.1 and 1011.1.1.2.
Where a change of occupancy occurs in a portion of an existing building and that portion is not separated from the remainder of the building with fire barriers having a fire-resistance rating as required in the Chicago Building Code for the separate occupancy, the entire building shall comply with all of the requirements of Chapter 9 of this code applied throughout the building for the most restrictive occupancy classification in the building and with the requirements of this chapter.
Where a change of occupancy occurs in a portion of an existing building and that portion is separated from the remainder of the building with fire barriers having a fire-resistance rating as required in the Chicago Building Code for the separate occupancy, that portion shall comply with all of the requirements of Chapter 9 of this code for the new occupancy classification and with the requirements of this chapter.
The provisions of Sections 1011.2 and 1011.3 for fire protection and interior finish, respectively, shall apply to all buildings undergoing a change of occupancy.
The relative degree of hazard between different occupancy classifications shall be determined in accordance with the categories specified in Tables 1011.4, 1011.5 and 1011.6. Such a determination shall be the basis for the application of Sections 1011.4 through 1011.7.
Fire protection systems shall be provided in accordance with Sections 1011.2.1 and 1011.2.2.
Where a change of occupancy occurs that requires an automatic sprinkler system to be provided based on the new occupancy in accordance with Chapter 9 of the Chicago Building Code, such system shall be provided throughout the fire area where the change of occupancy occurs.
Where a change of occupancy occurs that requires a fire alarm and detection system to be provided based on the new occupancy in accordance with Chapter 9 of the Chicago Building Code, such system shall be provided throughout the area where the change of occupancy occurs and shall be integrated with existing alarm notification appliances or systems as directed by the fire code official. Where the building is not equipped with a fire alarm system, alarm notification appliances shall be provided throughout the area where the change of occupancy occurs in accordance with Section 907 of the Chicago Building Code as required for new construction.
In areas of the building undergoing the change of occupancy, the interior finishes shall comply with the requirements of the Chicago Building Code for the new occupancy classification.

Hazard categories in regard to life safety and means of egress shall be in accordance with Table 1011.4.

TABLE 1011.4

MEANS OF EGRESS HAZARD CATEGORIES

RELATIVE HAZARD OCCUPANCY CLASSIFICATIONS
1 (Highest Hazard) H
2 I-2; I-3; I-4
3 A; E; I-1; M; R-1; R-2; R-4, Condition 2
4 B; F-1; R-3; R-4, Condition 1; R-5, S-1
5 (Lowest Hazard) F-2; S-2; U

Where a change of occupancy is made to a higher-hazard category (lower number) as shown in Table 1011.4, the means of egress shall comply with the requirements of Chapter 10 of the Chicago Building Code.

Exceptions:

  1. Stairways shall be enclosed in compliance with the applicable provisions of Section 903.1.
  2. Existing stairways including handrails and guards complying with the requirements of Chapter 9 shall be permitted for continued use unless determined to be unsafe by the building official.
  3. Where approved by the building official, a stairway replacing an existing stairway within a space where the pitch or slope cannot be reduced because of existing construction shall not be required to comply with the maximum riser height and minimum tread depth requirements.
  4. Existing corridor walls constructed on both sides of lath and plaster in good condition or 1/2-inch-thick (12.7 mm) gypsum wallboard shall be allowed. Such walls shall either terminate at the underside of a ceiling of equivalent construction or extend to the underside of the floor or roof next above.
  5. Existing corridor doorways, transoms and other corridor openings shall comply with the requirements in Sections 805.5.1, 805.5.2 and 805.5.3.
  6. Existing dead-end corridors shall comply with the requirements in Section 805.6.

Where a change of occupancy is made to an equal or lesser-hazard category (higher number) as shown in Table 1011.4, existing elements of the means of egress shall comply with the requirements of Section 905 for the new occupancy classification. Newly constructed or configured means of egress shall comply with the requirements of Chapter 10 of the Chicago Building Code.

Exception: Any stairway replacing an existing stairway within a space where the pitch or slope cannot be reduced because of existing construction shall not be required to comply with the maximum riser height and minimum tread depth requirements.

Egress capacity shall meet or exceed the occupant load as specified in the Chicago Building Code for the new occupancy.
Existing stairways shall comply with the handrail requirements of Section 805.9 in the area of the change of occupancy.
Existing guards shall comply with the requirements in Section 805.11 in the area of the change of occupancy.

Hazard categories in regard to height and area shall be in accordance with Table 1011.5.

TABLE 1011.5

HEIGHTS AND AREAS HAZARD CATEGORIES

RELATIVE HAZARD OCCUPANCY CLASSIFICATIONS
1 (Highest Hazard) H
2 A-1; A-2; A-3; A-4; I; R-1;
R-4, Condition 2
3 E; F-1; M; R-2; S-1
4 (Lowest Hazard) B; F-2; S-2; A-5; R-3;
R-4, Condition 1; R-5; U

Where a change of occupancy is made to a higher-hazard category (lower number) as shown in Table 1011.5, heights and areas of buildings and structures shall comply with the requirements of Chapter 5 of the Chicago Building Code for the new occupancy classification.

Exception: For high-rise buildings constructed in compliance with a previously issued permit and equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 of the Chicago Building Code, the type of construction reduction specified in Section 403.2.1 of the Chicago Building Code is allowed. This shall include the reduction for columns.

Where a change of occupancy is made to an equal or lesser-hazard category (higher number) as shown in Table 1011.5, the height and area of the existing building shall be deemed acceptable.

Where a change of occupancy is made to a higher-hazard category (lower number) as shown in Table 1011.5, fire barriers in separated mixed use buildings shall comply with the fire-resistance requirements of the Chicago Building Code.

Exception: Where the fire barriers are required to have a 1-hour fire-resistance rating, existing lath and plaster in good condition or existing 1/2-inch-thick (12.7 mm) gypsum wallboard shall be allowed.

Hazard categories in regard to fire-resistance ratings of exterior walls shall be in accordance with Table 1011.6.

TABLE 1011.6

EXPOSURE OF EXTERIOR WALLS HAZARD CATEGORIES

RELATIVE HAZARD OCCUPANCY CLASSIFICATION
1 (Highest Hazard) H
2 F-1; M; S-1
3 A; B; E; I; R
4 (Lowest Hazard) F-2; S-2; U
Where a change of occupancy is made to a higher-hazard category (lower number) as shown in Table 1011.6, exterior walls shall have exterior opening protectives as required by Section 1011.6.3 and fire-resistance ratings as required by the Chicago Building Code.
Where a change of occupancy is made to an equal or lesser-hazard category (higher number) as shown in Table 1011.6, existing exterior walls, including openings, shall be accepted.

Openings in exterior walls shall be protected as required by the Chicago Building Code. Where openings in the exterior walls are required to be protected because of fire separation distance, the sum of the area of such openings shall not exceed 50 percent of the total area of the wall in each story.

Exceptions:

  1. Where the Chicago Building Code allows openings in excess of 50 percent.
  2. Protected openings shall not be required in buildings of Group R occupancy that do not exceed four stories above grade plane in height and that are located not less than 24 inches (610 mm) from the lot line.
  3. Exterior opening protectives are not required where an automatic sprinkler system has been installed throughout.
  4. Exterior opening protectives are not required where the change of occupancy group is to an equal or lower hazard classification in accordance with Table 1011.6.
Enclosure of vertical shafts shall be in accordance with Sections 1011.7.1 through 1011.7.4.
Vertical shafts shall be designed to meet the Chicago Building Code requirements for atriums or the requirements of this section.

Where a change of occupancy is made to a higher-hazard category (lower number) as shown in Table 1011.4, interior stairways shall be enclosed as required by the Chicago Building Code.

Exceptions:

  1. In other than Group I occupancies, an enclosure shall not be required for openings serving only one adjacent story and that are not connected with corridors or stairways serving other stories.
  2. [Reserved]
  3. Existing penetrations of stairway enclosures shall be accepted if they are protected in accordance with the Chicago Building Code.

Interior vertical shafts other than stairways, including but not limited to elevator hoistways and service and utility shafts, shall be enclosed as required by the Chicago Building Code where there is a change of occupancy to a higher-hazard category (lower number) as specified in Table 1011.4.

Exceptions:

  1. Existing 1-hour interior shaft enclosures shall be accepted, even where a higher rating is required by the Chicago Building Code .
  2. Existing vertical openings, other than stairways, in buildings of other than Group I occupancy and connecting less than six stories shall not be required to be enclosed if the entire building is provided with an automatic sprinkler system.
Where a change of occupancy is made to an equal or lesser-hazard category (higher number) as shown in Table 1011.4, the existing enclosure of vertical shafts shall be accepted.
Where a change of occupancy is made to a Group R occupancy, existing stairway and elevator shafts shall be enclosed in accordance with Section 713 of the Chicago Building Code. Stairs, elevators and escalators may all be placed in the same enclosure.
Openings into existing vertical shaft enclosures shall be protected by fire assemblies having a fire protection rating of not less than 1 hour and shall be maintained self-closing or shall be automatic-closing by actuation of a smoke detector. Existing fusible link-type automatic door-closing devices shall be allowed in all shafts except stairways if the fusible link rating does not exceed 135°F (57°C).
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