CODES

ADOPTS WITH AMENDMENTS:

International Existing Building Code 2018 (IEBC 2018)

Heads up: There are no suggested sections in this chapter.
Heads up: There are no amended sections in this chapter.
An addition to a building or structure shall comply with the Uniform Code as adopted for new construction without requiring the existing building or structure to comply with any requirements of those codes or of these provisions, except as required by this chapter. Where an addition impacts the existing building or structure, that portion shall comply with this code.
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, 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 Chapter 6.
An addition shall not increase the height of an existing building beyond that permitted under the applicable provisions of Chapter 5 of the Building Code of New York State for new buildings.

An addition shall not increase the area of an existing building beyond that permitted under the applicable provisions of Chapter 5 of the Building Code of New York State for new buildings unless fire separation as required by the Building Code of New York State is provided.

Exception: In-filling of floor openings and nonoccupiable appendages such as elevator and exit stairway shafts shall be permitted beyond that permitted by the Building Code of New York State.

Existing fire areas increased by the addition shall comply with Chapter 9 of the Building Code of New York State.

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 Building Code of New York State 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 occupancy with not more than five dwelling units or sleeping units used solely for residential purposes where the existing building and the addition together comply with the conventional lightframe construction methods of the Building Code of New York State or the provisions of the Residential Code of New York State.

Where the addition is structurally independent of the existing structure, existing lateral load-carrying structural elements shall be permitted to remain unaltered. Where the addition is not structurally independent of the existing structure, the existing structure and its addition acting together as a single structure shall meet the requirements of Sections 1609 and 1613 of the Building Code of New York State using full seismic forces.

Exceptions:

  1. Buildings of Group R occupancy with not more than five dwelling or sleeping units used solely for residential purposes where the existing building and the addition comply with the conventional light-frame construction methods of the Building Code of New York State or the provisions of the Residential Code of New York State.
  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 permitted 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 Building Code of New York State. 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.

Additions and foundations in flood hazard areas shall comply with the following requirements:

  1. For horizontal additions that are structurally interconnected to the existing building:

    1. 1.1. If the addition and all other proposed work, when combined, constitute substantial improvement, the existing building and the addition shall comply with Section 1612 of the Building Code of New York State, or Section R322 of the Residential Code of New York State, as applicable.
    2. 1.2. If the addition constitutes substantial improvement, the existing building and the addition shall comply with Section 1612 of the Building Code of New York State, or Section R322 of the Residential Code of New York State, as applicable.
  2. For horizontal additions that are not structurally interconnected to the existing building:

    1. 2.1. The addition shall comply with Section 1612 of the Building Code of New York State, or Section R322 of the Residential Code of New York State, as applicable.
    2. 2.2. If the addition and all other proposed work, when combined, constitute substantial improvement, the existing building and the addition shall comply with Section 1612 of the Building Code of New York State, or Section R322 of the Residential Code of New York State, as applicable.
  3. For vertical additions and all other proposed work that, when combined, constitute substantial improvement, the existing building shall comply with Section 1612 of the Building Code of New York State, or Section R322 of the Residential Code of New York State, as applicable.
  4. For a raised or extended foundation, if the foundation work and all other proposed work, when combined, constitute substantial improvement, the existing building shall comply with Section 1612 of the Building Code of New York State, or Section R322 of the Residential Code of New York State, as applicable.
  5. For a new foundation or replacement foundation, the foundation shall comply with Section 1612 of the Building Code of New York State or Section R322 of the Residential Code of New York State, as applicable.
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 1103.8 of the Fire Code of New York State or Section R314 of the Residential Code of New York State as applicable.
Carbon monoxide detection and notification shall be provided in accordance with Sections 502.7 through 502.7.1 for buildings that undergo an addition.

Where an addition is added to an existing Group E occupancy located in an area where the shelter design wind speed for tornados is 250 mph in accordance with Figure 304.2(1) of ICC 500 and the occupant load in the addition is 50 or more, the addition shall have a storm shelter constructed in accordance with ICC 500.

Exceptions:

  1. Group E day care facilities.
  2. Group E occupancies accessory to places of religious worship.
  3. Additions meeting the requirements for shelter design in ICC 500.

The required occupant capacity of the storm shelter shall include all buildings on the site, and shall be the greater of the following:

  1. The total occupant load of the classrooms, vocational rooms and offices in the Group E occupancy.
  2. The occupant load of any indoor assembly space that is associated with the Group E occupancy.

Exceptions:

  1. Where an addition is being added on an existing Group E site, and where the addition is not of sufficient size to accommodate the required occupant capacity of the storm shelter for all of the buildings on-site, the storm shelter shall at a minimum accommodate the required capacity for the addition.
  2. Where approved by the building official, the required occupant capacity of the shelter shall be permitted to be reduced by the occupant capacity of any existing storm shelters on the site.
Storm shelters shall be located within the buildings they serve, or shall be located where the maximum distance of travel from not fewer than one exterior door of each building to a door of the shelter serving that building does not exceed 1,000 feet (305 m).
Additions to existing buildings shall conform to the energy requirements of the Energy Conservation Construction Code of New York State or Residential Code of New York State as they relate to new construction.
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