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State of Assam - Section

Section 63 in Assam Notified Urban Areas (Other than Guwahati) Building Rules, 2014

63. Staircases.

(1)Every staircase shall be suitably lighted and properly ventilated through an external wall.
(2)The minimum clear width of staircases in case of domestic building shall not be less than 0.9m.
(3)The minimum clear width of staircases in case of public building shall not be less than 1.5 m for every 300 persons who are expected to use the building. The furthest corner of the building shall not be more than 18 m distance from the staircase.
(4)The minimum rise and minimum breadth of tread of staircases shall be as follows :-Table 6: Specifications of Staircases
Types Maximum rise Minimum tread of obstruction
Domestic buildings 175 mm 225 mm
Public buildings 150 mm 275 mm
Hospital & Auditorium 150 mm 300 mm
(5)Interior staircase may be constructed with fire resistant materials throughout.
(6)A staircase shall not be arranged around a lift shaft, unless the latter is entirely enclosed with material with fire resistant rating and that for type of construction itself. For building more than 15.8 m in height, the staircase location shall be to the satisfaction of the Authority regulating fire safety and the distance from the furthest corner of the building to the staircase should not be more than 18 m.
(7)The minimum head room in a passage under the landing or under the staircase, if provided shall be 2.2m.
(8)All buildings which are more than 15 m in height and all buildings used as educational, assembly, institutional, industrial store and hazardous occupancies and mixed occupancies having area more than 500 sq.m. on every floor shall have minimum two staircases. At least one of them shall be on external wall of buildings and shall open directly to the exterior / interior open space as to an area of safety. The provision or otherwise of alternative staircase shall be subject to the requirement of travel distance being complied with.
(9)The use of spiral staircase (fire escape) shall be limited to a building 12.8 m in height and to be connected with external balconies and shall be designed to give adequate head room.
(10)Ramps other than for parking floor shall have slope of not more than 1 : 10 provided that in case of public office, hospitals, slope of ramps shall not be more than 1 : 12. The minimum width of the ramps for hospitals should not be less than 2.0m.