What is the minimum width for the main stairway in a residential dwelling?

The minimum width for the main stairway in a residential dwelling is established to ensure safe and comfortable passage for individuals using the stairs. A width of 3'-0" provides enough space for two people to pass each other without difficulty, which is particularly important in residential settings where families or guests may be moving up and down frequently. This dimension also complies with building codes, which are designed to promote safety and accessibility.

In addition, a width of 3'-0" accommodates various stair configurations and shoe sizes, reducing the risk of accidents, especially in emergency situations where quick movement is required. It allows for the easy transportation of furniture or larger items that may be moved through the stairway.

Wider options are available for more accommodating needs or specific building guidelines, but 3'-0" is the standard minimum width that balances safety and usability within a residential context.