The Ontario Building Code | Risers for Stairs
18.104.22.168. Risers for Stairs
(1) In a Group A, Division 2 occupancy used for the serving of food and beverages, an interior flight of stairs with fewer than three risers is permitted provided it,
(a) is not less than 900 mm wide,
(b) is illuminated at all times that occupants are on the premises, and
(c) has a handrail on each side.