What is the minimum recommended total width for a main stairway?

The minimum recommended total width for a main stairway is 3 feet (3'-0"). This width is established to ensure safety, accessibility, and ease of use in a stairway that typically experiences higher traffic, especially in public or multi-family residential buildings. A 3-foot width allows two people to pass each other comfortably, which is crucial in emergency situations where swift movement is required. Additionally, this width aligns with building codes and regulations that prioritize accessibility, including compliance with standards for wheelchair users and those with mobility challenges.

While other widths listed may be suitable in specific contexts, they do not meet the minimum standard needed for a main stairway, which should accommodate a wider range of users and situations effectively. Thus, the choice of 3'-0" as the minimum is grounded in both safety and practical usability considerations.