Final answer:
The minimum width of a stairway, measured between the finished walls of the stairwell, is typically 36 inches or 91.44 centimeters.
Step-by-step explanation:
The minimum width of a stairway, measured between the finished walls of the stairwell, is typically determined by building codes and regulations. In the United States, the International Building Code (IBC) sets the minimum width for stairways. According to the IBC, the minimum width is 36 inches or 91.44 centimeters.