Sec.
[D26-30.01] 27-2057 Lighting and Ventilation in
Multiple Dwellings; General Requirements
a. No multiple
dwelling shall be so altered as to diminish the light and ventilation of any
room in any way not approved by the department.
b. Every required
window shall be so located as to light properly all portions of the room.
c. Any obstruction
of required light and ventilation shall be unlawful.
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Sec.
[D26-30.03] 27-2058 Lighting and ventilation of
living rooms in multiple dwellings erected after 1929
a. Required windows.
Every living room in a multiple dwelling erected after April 18, 1929, shall
have at least one window opening on:
(1) a street;
(2) a lawful
yard or court on the same lot;
(3) a partially
enclosed balcony or space above a setback which opens directly to a street,
yard or court if the area of the front of such balcony or space open to the
outer air is at least equal to 75 per cent of the floor area of such balcony
or space; or
(4) a completely
enclosed balcony or space above a setback in a fireproof multiple dwelling
if the enclosure is not more than one story in height; the outer enclosing
walls and roof are of incombustible materials; an area, glazed with clear
plate glass or plastic equivalent, on the outer enclosing walls if at least
fifty percent of the area of the interior enclosing walls; and at least fifty
percent of such glazed area opens on a street, legal yard or court. One-half
of such glazed area shall be openable. A living room does not include a kitchen
under this paragraph (4).
b. No required
window of a living room shall open on an offset or a recess of less than six
feet in width.
c. Size of windows
(1) The total
area of all windows in the room shall be at least one-tenth the floor area
of such room, except that when a room opens solely on a balcony or space above
a setback the total area of such opening shall be one-tenth the combined floor
area of the room and that portion of the balcony or space directly in front
of such room. In determining the ratio of windows to floor area, the combined
glazed area of windows and doors opening on a balcony or a space above a setback
may be used.
(2) Every required
window shall be at least twelve square feet.
(3) At least
one-half of every required window shall open, except that for a mullioned
casement window a minimum of five and one-half square feet is sufficient.
In a room where a centralized mechanical ventilating system provides 40 cubic
feet of air per minute, 25 per cent of the window area or five and one-half
square feet of such area, whichever is greater, shall be openable.
(4) The top
of one required window in every room shall be at least seven feet above the
floor, except that in dwellings erected pursuant to plans filed after April
23, 1959, and prior to June 14, 1967, this requirement shall not apply.
d. Through ventilation
(1) No part
of any living room with windows, or doors in lieu thereof, opening on a balcony
or space above a setback shall be more than 30 feet from the exterior face
of the outer enclosing wall.
(2) In any dwelling
unit in a non-fireproof multiple dwelling or in a dwelling unit of three rooms
or less in a fireproof multiple dwelling, no part of any room shall be more
than 30 feet from a window opening on a street or yard unless such room also
opens on a legal court.
e. Openings on
lot line. Every window and its assembly in a wall situated on a lot line, except
a street line, shall be fireproof; the assembly shall have a fire resistive
rating of at least three quarters of an hour; and the window shall be glazed
with wire glass at least one-quarter of an inch thick. Every such window shall
be of automatic self-closing construction whenever it is less than 50 feet above
the non-fireproof roof of another structure located 30 feet or less from the
lot line.
f. Dining space.
A dining space shall have a window which:
(1) complies
with the provisions of subdivision (a) of this section, and
(2) has an area
at least one-eighth the floor area of such dining space.
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Sec. [D26-30.05] 27-2059 Lighting and ventilation
of living rooms in converted dwellings
a. Required windows
Except as provided
in subdivision (c), every living room in a converted dwelling shall have at
least one window opening on:
(1) A street,
(2) A yard or
outer court which complies with the provisions of section 172 of the multiple
dwelling law, or
(3) An inner
court or shaft with minimum dimensions of three feet, nine inches in width
and eight feet in length. For a room located on the top story, a skylight
of the dimensions required in subdivision (b) may be substituted for a window.
b. Size of windows
(1) The total
area of all windows in the room shall be at least one-tenth the floor area
of such room.
(2) Every required
window or skylight shall be at least twelve square feet, except that if the
total area of windows in the room is one-eighth of the floor area this requirement
shall not apply.
(3) At least
one-half of every required window shall open. One-half of the skylight shall
have ventilating openings, unless (a) the skylight is equipped with a minimum
of 144 square inches of ventilation, and (b) there is at least one window
in the room, and (c) the combined glazed area of the skylight and window is
at least one-eight of the floor area.
(4) The top
of every required window shall be at least seven feet above the floor, except
that on the top story it shall be a minimum of six feet above the floor.
c. Noncomplying
rooms
(1) A room which
is noncomplying with the minimum room size requirements of subdivision b of
section 27-2074 of article four of this subchapter or with the requirements
of subdivisions a and b of this section may not be occupied unless it has
a single or unbroken opening of not less than thirty-two and one-half square
feet into an immediately adjoining room. Such adjoining room shall have a
window on a street or yard which complies with the provisions of section one
hundred seventy-two of the multiple dwelling law, except that if the dwelling
is two stories or less in height, the window of such adjoining room may open
on an outer court or a court not less than four feet in width extending from
street to yard.
(2) No room
may be subdivided in any manner unless each subdivided portion meets the requirements
of paragraph one of this subdivision, or of subdivision a of this section.
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Sec.
[D26-30.07] 27-2060 Lighting and ventilation of
living rooms in new law tenements.
a.
Required windows. Every living room in a new law tenement shall have a window
opening on:
(1) A
street, or
(2) A
lawful yard or court.
b. Size of windows.
(1) The total
area of all windows in the room shall be at least one-tenth the floor area
of such room.
(2) Every required
window shall be at least twelve square feet.
(3) At least
one-half of every required window shall open.
(4) The top
of one required window in a room shall be at least seven feet six inches above
the floor.
c. Through ventilation.
(1) Every part
of a dwelling unit of three rooms or less shall be either within eighteen
feet of a street or yard or have a window opening upon a lawful court.
(2) If the window
of any room opens on an inner court with a width or less than ten feet between
the exterior wall of the dwelling and the lot line there shall be a sash window
connecting such room to an adjoining room within glazed area, one-half of
which shall open.
d. Dining space.
A dining space shall have at least one window:
(1) That complies
with the provisions of subdivision a; and
(2) That has
an area not less than one-eighth the floor area of such dining space.
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Sec.
[D26-30.09] 27-2061 Lighting and ventilation of
living rooms in old law tenements.
a. Required windows.
Every living room in an old law tenement shall either have a window opening:
(1) On a street;
or
(2) On a yard
at least four feet in depth; or
(3) On a court
or shaft at least twenty square feet in area open to the sky without a roof
or skylight; or
(4) Above the
roof on an adjoining building; or it shall meet the requirements of the multiple
dwelling law. In the event that a window opens above the roof of an adjoining
building and the light and air from the adjoining lot is thereafter diminished
in any way, the department may determine that such a room is a non complying
room and require compliance with the requirements of the multiple dwelling
law. For a room located on the top story, a ventilating skylight opening to
the outer air may be substituted for a window. At least one-half of every
required window shall open.
b. Dining space.
A dining space shall have at least one window which:
(1) Opens on
a street, yard or legal court, and
(2) Has an area
not less than one-eight the floor area of such dining space.
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Sec.
[D26-30.11] 27-2062 Lighting and ventilation in
one- and two-family dwellings.
a. Required windows.
Every living room
shall have at least one window open to a street, public place or an open and
ubobstructed yard, court or other required open space on the same lot as the
dwelling.
b. Size of windows;
substitutes for windows.
(1) The total
area of all windows in the room shall be at least one-tenth the floor area
of such room, or twelve square feet, whichever is greater.
(2) Skylights,
opening directly to the outer air, transparent or translucent panels or doors,
or other natural light transmitting media may be substituted for window openings,
subject to the approval of the department, if they provide an equivalent amount
of light to that transmitted through the window area required in paragraph
one of this subdivision.
(3) At least
forty-five percent of the required window area, skylight or other openings
shall be openable to provide natural ventilation. If a mechanical ventilation
system provides forty cubic feet of air per minute, the openable area may
be reduced to twenty-five percent.
c. Noncomplying
rooms.
(1) A living
room in a one- or two-family dwelling constructed after January first, nineteen
hundred thirty-eight which meets the minimum room size requirements of article
four of this subchapter but does not comply with subdivision a of this section
may not be occupied unless it has a single unbroken opening of not less than
sixty square feet into an immediately adjoining room. The adjoining room shall
have at least one window opening to the outer air and such window shall be
not less than one-tenth of the combined floor area of the room.
(2) In a one-
or two-family dwelling constructed prior to January 1, 1938, an opening shall
be required between a room without a window and an immediately adjoining living
room with at least one window. Such opening shall have a minimum size of thirty-two
and one-half square feet.
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