![]() ![]() This measurement is taken from the front lip of a tread to the back corner of a tread, and it is the same irrelevant of which type of material is used to construct the stairs and the treads. Exterior Stair Depth Requirementsįor exterior staircases, each tread must be a minimum of 10 inches deep. For example, this could include a staircase on the outside of a single-family home or an exterior staircase on an apartment building that has 6 apartments and no more than 50 occupants.įor commercial and public staircases or residential staircases which serve more than 50 occupants, the minimum width requirement is 44 inches. This minimum measurement applies for domestic and residential exterior staircases which serve less than 50 occupants. This measurement is taken from the far end of one tread to the opposite end of the same tread, either from left to right or right to left when facing the stairs head-on. ![]() The required width measurement of a stair tread is a minimum 36 inches. And finally, handrails on external stairs need to be fitted at a height of between 34 inches and 38 inches above the tread level.įind the summary of exterior requirements in this diagram below. ![]() The height from the stair treads to the ceiling should be at least 80 inches. The riser in residential and commercial premises must have a minimum height of 4 inches and a maximum height of 7.75 inches. Many of the requirements for exterior stairs are the same as those for interior stairs, which you can learn about in greater depth here.Īn exterior stair should have a stair tread with a minimum width of 36 inches, and a minimum depth of 10 inches. If you are building an exterior staircase, for example, a staircase that leads to your raised front door or a staircase down from a balcony area, then you will need to be aware of the code requirements in your area.Īlthough building codes differ depending on location, stair codes are usually based around International Building Code and the Occupational Safety and Health Administration guidance. ![]()
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