35. Mezzanine floor.-
(1) The floor area of
mezzanine floor shall not exceed one third area of the main floor or
room accommodating the mezzanine floor.
(2) The headroom
measured from the surface of the floor to any point on the underside
of the mezzanine floor shall not be less than 2.2 mts.
36. Height of room.-
The height of room in
a building other than residential occupancy shall be not less than 3.00 metres:Provided that in the case of air conditioned rooms it shall be not
less than 2.4 metres.-
37. Water closet.-
Every building shall
be provided with at least one water closet.
38. Size of bathroom and latrine.-
(1) The area of
bath-room shall not be less than 1.50 sq.m. with either side not less
than 1.1m, carpet area of a latrine shall not be less than 1. 1 0
square metres with one side not less than 1.0 metre:
Provided that the
area of combined bathroom and latrine shall be not less than 2.2
square metres with one side not less than 1. 1 metres:
The height of bathroom or latrine shall be not less than 2.20 metres.
(1) Any building
having more than four floors including basement or sunken floors,
shall have at least two staircases, one of which may be an external
Provided that when
the second staircase provided as external stair way conforms to the
provisions of fire escape staircase, a separate fire escape stair need
not be provided.
Note:- An external
stair is one which is connected to public areas and/or common areas on
all floors and leads directly to ground, has at least two sides
abutting external wall, these two sides being provided as open or with
break open glass and has landing areas accessible from the external
side or a external stair which is wholly open and removed from the
main building, such an external stair shall be removed and away
from the main stairway.
(2) The minimum width
of stair shall be not less than 1.20 metres [X X X]
(3) The minimum width
of tread shall be 30 cms [x x x]
(4) The height of
riser shall not exceed 15 cms. [x x x].
(5) The height of
handrail shall be not less than 90 cms.
(6) The width of
passages giving access to the staircase in any building shall not at
any point, be less than the width of the stair.
Ramps if provided as
a substitute for stairways shall be laid with a slope not exceeding 1
in 10 and such ramp shall comply with all requirements of a stairway
and shall be surfaced with approved non-slippery materials.
41. Corridor, verandahs and passageways.-
The clear width of
any corridor, verandah or passageway in any building shall be not less
than 1.0 metre at any point.
42. Fire escape staircase.-
(1) Fire escape stair
case shall be provided for every buildings of,-
occupancies exceeding three storeys above ground level;
(b) occupancies other
than residential exceeding two storeys above ground level.
(2) The width of fire
escape staircase shall be not less than 75 cm, the width of fire
escape stair tread shall be not less than 15 cm, the height of the
fire escape stair riser shall not exceed 19 cms, and the number of
riser shall not exceed 16 per flight of stairs.
(3) The height of
handrail of a fire escape staircase shall not be less than 100 cms.
(4) Fire escape stair
shall be constructed only in the exterior of the building and shall be
connected directly to the ground.
(5) Fire escape
stairs shall have a straight flight.
(6) Entrance to fire
escape stair case shall be separated and removed from internal
43. Travel distance to emergency staircase.-
(1) Every building
meant for human occupancy shall be provided with emergency exit
sufficient to permit safe escape of occupants in case of fire or
whenever other emergency occurs.
(2) Emergency exits
shall be located in such a way that the travel distance on each floor
shall not exceed 30 metres for every occupant.
44. Fire Protection requirements.-
All requirements in
respect of fire protection shall be as in Part IV, Fire Protection in
National Building Code of India, 1983 and amendment No. 3 under Fire
Protection Annexure 11.
45. Exit Width.-
(1) The unit of exit
width used to measure the capacity of any exit shall be 50 cms., a
clear width of 25 cms. shall be counted as an additional half unit and
clear width less than 25 cms. shall not be counted for exit width.
(2) Occupants per unit exit width shall be as in Table 6.
Occupants per unit exit width
Occupants per unit exit width of Stairway
H Storage (including Warehousing)
(3) For determining
the exit required, the number of persons in any floor area or the
occupant load shall be based on the actual number of occupants but in
case less than that specified in Table 7.
Load (gross area in square meters per person)
||3 to 6
H Storage (including Warehousing)
(4) Exits shall be either horizontal or vertical type.
(5) An exit may be a
doorway corridor or passageway to an internal staircase or external
staircase, ramps to the street or to the roof of a building; it may be
a horizontal exit leading to an adjoining building at the same level:
Provided that lifts
and escalators shall not be considered as exits.
(1) Every exit
doorway shall open into an enclosed stairway or a horizontal exit or a
corridor or passageway providing continuous and protected means of
(2) No exit doorway
shall be less than 75 cms in the case of residential and 1.2 metres in
the case of all other occupancies.
47. Spiral stair fire escape.-
(1) The use of spiral
staircase shall be limited to low occupant load and buildings upto 9
metres in height unless they are connected to platforms such as
balconies and terraces to allow easy exit.
(2) A spiral
staircase shall be not less than 150 cm. in diameter and shall be
designed to give adequate head room.
(1) Every building
exceeding 3 storeys (excluding sunken floors) in the case of
hospitals/medical occupancy and 4 storeys (excluding sunken floors) in
the case of other occupancies having plinth area more than 2500 sq.
metres shall be provided with one lift for every 2500 sq. metres or
part thereof exceeding first 2500 sq. metres, in addition to the
required number of staircases as per rule 39.
(2) The planning,
design and installation of lifts shall be in accordance with Part
VIII, Building services, Section 5, Lift, Elevators and Escalators in
National Building Code of India, 1983.
(3) Whenever more than one lift is
required as per sub rule(1) or byelaws made under the Act, at least
one lift shall be a higher capacity lift that can carry a
49. Lighting and Ventilation.-
(1) Every habitable
room shall be furnished with sufficient number of openings such as
windows and ventilators affording effectual means of admission of
light and air by direct communication with the external air as
provided in the National Building Code, 1983 or shall be sufficiently
lighted and ventilated by artificial means.
(2) No portion of a room shall be assumed to be lighted if it is more
than 7.5 metres away from the opening assumed for lighting that
portion unless it is artificially lighted.
(3) Windows and
ventilators which open into a verandah shall be deemed to communicate
with the external air, if such verandah is not more than 3 metres wide and open throughout its entire length into an open space
open to the sky the width of such open space being not less
than 3.0 metres. Trellising, mesh, grill or net may, however, be
provided on the open side of the verandah;
(4) Every kitchen
shall be ventilated according to the standards stipulated for
habitable rooms and shall have suitable flue for the escape of smoke
and heated air unless it is provided with an approved form of
(5) Every bathroom or
latrine shall be provided with sufficient light and ventilation.-
(6) Every bathroom or
latrine shall have at least one of its walls abutting on an open space
or open verandah or an air shaft if not centrally air conditioned; the
size of air shaft shaft not be less than that specified in Table 8.
Size of Air Shaft
||Area of the
airshaft in Square meter
width of Airshaft in meter
50. Recreation space
(1) Any residential
apartment having more than 12 dwelling units in a single plot or
shall be provided with a recreation space of suitable size.
(2) The recreation
space as per sub rule(1) shall have not less than 7.5 per cent of the
total carpet area of all the units taken together and may be provided
either inside a building or outside a building or both and if t is
provided outside a building it shall be exclusive of parking areas,
drive ways and other utility areas.
1) Spaces like
swimming pool, recreation hall or health club shall also be considered
as recreation space for this purpose.
(2) The recreation
space may be provided as a single unit or as different units.
51. Certain Buildings exempted.-
buildings with not more than three floors constructed in plots with
are not exceeding 283.36 sq meters(7cents) shall be exempted from the
provisions in this chapter other than that in rule 42 and rule 44