1010.1.5 Floor elevation.

There shall be a floor or landing on each side of a door. Such floor or landing shall be at the same elevation on each side of the door. Landings shall be level except for exterior landings, which are permitted to have a slope not to exceed 0.25 unit vertical in 12 units horizontal (2-percent slope).

   Exceptions:

      1.   Doors serving individual dwelling units in Groups R-2 and R-3 where the following apply:

         1.1.   A door is permitted to open at the top step of an interior flight of stairs within the dwelling unit, provided the door does not swing over the top step.

         1.2.   Screen doors and storm doors are permitted to swing over stairs or landings.

      2.   Exterior doors as provided for in Section 1003.5, Exception 1, and Section 1022.2, which are not on an accessible route.

      3.   In Group R-3 occupancies not required to be Accessible units, Type B+NYC units or Type B units, the landing at an exterior doorway shall be not more than 7 3/4 inches (186.9 mm*) below the top of the threshold, provided the door, other than an exterior storm or screen door, does not swing over the landing.

* Editor's note: As set forth in L.L. 2021/126; correct conversion should be 196.9 mm.

      4.   Variations in elevation due to differences in finish materials, but not more than 1/2 inch (12.7 mm).

      5.   Exterior spaces of Type B+NYC units and Type B units where permitted pursuant to the exception to Section 1107.4.

      6.   Doors serving equipment spaces not required to be accessible in accordance with Section 1103.2.9 and serving an occupant load of five or less shall be permitted to have a landing on one side to be not more than 7 inches (177.8 mm) above or below the landing on the egress side of the door.

1010.1.6 Landings at doors.

Landings shall have a width not less than the width of the stairway or the door, whichever is greater. Doors in the fully open position shall not reduce a required dimension by more than 7 inches (177.8 mm). At any stairway landing, or when a door landing serves an occupant load of 50 or more, doors in any position shall not reduce the landing to less than 75 percent of its required width. Landings shall have a length measured in the direction of travel of not less than 44 inches (1117.6 mm).

   Exceptions:

      1.   Landing length in the direction of travel in Groups R-3 and U and within individual units of Group R-2 need not exceed 36 inches (914.4 mm).

      2.   In Group R-2 occupancies, where 36 inch wide stairways are permitted pursuant to Section 1011.2, Exception 1.2, such stairway landing length in the direction of travel shall be permitted to be not less than 36 inches (914.4 mm) or the width of the stairway, whichever is greater. Doors opening onto such stairway landings shall not reduce the landing width.

1010.1.7 Thresholds.

Thresholds at doorways shall not exceed 3/4 inch (19.1 mm) in height above the finished floor or landing for sliding doors serving dwelling units or 1/2 inch (12.7 mm) above the finished floor or landing for other doors. Raised thresholds and floor level changes greater than 1/4 inch (6.4 mm) at doorways shall be beveled with a slope not greater than one unit vertical in two units horizontal (50-percent slope).

   Exceptions:

      1.   In occupancy Group R-2 or R-3, threshold heights for sliding and side-hinged exterior doors shall be permitted to be up to 7 3/4 inches (196.9 mm) in height if all of the following apply:

         1.1.   The door is not part of the required means of egress.

         1.2.   The door is not part of an accessible route as required by Chapter 11.

         1.3.   The door is not part of an Accessible unit, Type B+NYC unit or Type B unit.

         1.4.   The exterior door, other than a storm or screen door, does not swing over the landing or step.

      2.   In Type B+NYC units and Type B units, where permitted pursuant to the exception to Section 1107.4, the threshold height on the exterior side of the door shall not exceed 4 3/4 inches (120.7 mm) in height above the exterior deck, patio or balcony for sliding doors or 4 1/2 inches (114.3 mm) above the exterior deck, patio or balcony for other doors.

1010.1.8 Door arrangement.

Space between two doors in a series shall be 48 inches (1220 mm) minimum plus the width of a door swinging into the space. Doors in series shall swing either in the same direction or away from the space between the doors.

   Exceptions:

      1.   The minimum distance between horizontal sliding power-operated doors in a series shall be 48 inches (1220 mm).

      2.   Storm and screen doors serving individual dwelling units in Groups R-2 and R-3 need not be spaced 48 inches (1220 mm) from the other door.

      3.   Doors within individual dwelling units in Group R-3.

      4.   Doors within individual dwelling units in Group R-2 that are not required to comply with Section 1107.

      5.   Exterior doors in vestibules in Group R-2 occupancies shall not be required to swing either in the same direction or away from the space between doors provided that the 48-inch (1220 mm) minimum space between door swings is maintained.