Any well planned stair should meet the following criteria for easy, quick and safe ascent/descent.
Location: It should be located so as to get sufficient light and ventilation with easy access from all the rooms. No door should directly open to a staircase.
Stair width: Varies with situation however should follow the standard recommended dimensions according to the building types.
Length of flight: A flight should have not lesser than three risers and not more than 16 risers.
Pitch of stair: Stairs are pitched from 15 degrees to 55 degrees; however recommended angle is between 25 to 40 degrees. Pitch of long should be flattened by using landings.
Headroom: Minimum Clearance from tread to the soffit of stair above (true vertical measurement) is 2.1m.
Materials: Should be fire resisting as far as possible.
Baluster: Open well stairs should have it to avoid accidents.
Landing: Width of the landing should not be less than width of the stair flight at any case.
Winders: Should be avoided as far as possible, if not, should be kept at lower end of flight. These are not suitable for public buildings.
Step Proportions: The rise/going of each step in one flight and in flights and landing between floors should be equal. Any variations may spoil rhythm. The rise/going are proportioned so as to ensure comfortable access.