How Wide Should Exterior Stairs Be?


The stairs should be at least 36 inches wide.

Requirements of Good Stairs Construction for House | Good Stairs Design Requirements |

Peep and the Big Wide World: House of Sand and Frog

What Is Average Tread Width Measurement? – Building Stairs

Frequently Asked Questions

How big of a stair tread do you need for a deck?

The stair treads should be at least 36 inches wide. Despite these minimum requirements, we recommend that stairs should be at least 48 inches wide so they don’t feel cramped. The maximum allowable stair rise is 7 3/4 inches, and the minimum stair rise is 4 inches. For recommendations on rise-run combos, see the tip below.

How big of a staircase do you need for one person?

For stairs serving a single user (typically private residential), a minimum of 36” (91 cm) is required. In general public spaces a minimum of 44” (112 cm) must be met—providing ample space for one person and allowing the tight passage of two people.

How big should a stair step riser be?

Another rule of thumb for riser and tread design is that the sum of the two dimensions be between 17 and 17 and one-half inches. If a riser is seven inches high the tread depth should be no more than 10 and one-half inches deep.

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