N.Y.C. Admin. Code § EBC 1105: Section EBC 1105: Means of Egress

1105.1 General.

Means of egress from an addition to an existing building or structure shall comply with Chapter 10 of the New York City Building Code and with this section. Means of egress from additions shall be permitted to utilize existing exit facilities of the building or structure in accordance with sections 1105.2 through 1105.3. Compliance with Chapter 10 of the New York City Building Code for the new addition’s means of egress shall not conflict with the safe use of the existing egress facilities.

1105.2 The addition does not increase the existing floor surface area by more than 110 percent.

Where the addition including alteration made to the building does not exceed the existing floor surface area by more than 110 percent pursuant to Section 302.7, the existing exit facilities shall be permitted to be utilized by the new addition to discharge onto the outside, subject to Sections 1105.2.1 and 1005.2.2. Such existing exit facilities shall be in compliance with the terms of their approval prior to the proposed addition.

1105.2.1. Prior code buildings.

Means of egress components serving the addition shall comply with Chapter 10 of the New York City Building Code or as permitted by Section 305.5.

1105.2.1.1 Vertical exits.

In prior code buildings, existing vertical exits may be extended to serve the addition, maintaining its width, in compliance with Section 305.5 provided the occupant load of the new addition shall not exceed the capacity of the existing stairs.

1105.2.2 Horizontal additions.

Where the horizontal addition contains a new egress stair, such stair shall comply with Chapter 10 of the New York City Building Code. The new addition shall be permitted to utilize the additional exit facilities provided in the existing portion of the building. Where such existing building is a prior code building, use of existing means of egress shall be permitted to comply with Section 305.5.

1105.3 Work that increases existing floor surface area of an existing building by more than 110 percent.

Where the addition including alteration made to the building involves an increase in the floor surface area by more than 110 percent, as per Section 1101.4, the entire means of egress system for the building including the addition shall comply with Chapter 10 of the New York City Building Code as if hereafter erected.

Exception: The existing means of egress need not be altered to meet the requirements of Chapter 10 of the New York City Building Code as hereafter erected where the horizontal addition made to the existing building acts as an independent building section meeting all the following conditions:

1. The horizontal addition is provided with means of egress independent of the existing building;

2. The horizontal addition is separated from the existing building by a minimum of two-hour rated fire barrier; and

3. The horizontal addition complies with all applicable fire protection requirements of Chapter 9 of the New York City Building Code.