What is the minimum width allowed for a residential staircase?

The correct answer is based on the North Carolina Residential Code, which mandates that the minimum width for a residential staircase must be at least 36 inches. This requirement ensures safe and comfortable passage for individuals using the stairs, including the possibility of moving furniture or emergency situations where wider access may be necessary. The specified width provides adequate space for two people to pass each other on the staircase and is vital for promoting safety, especially in instances where accessibility is a concern.

While 30 inches may seem sufficient for a narrow stairway, it does not comply with the regulations set out to ensure safety in residential buildings. Wider options such as 42 and 48 inches exceed the minimum requirements but are not necessary to meet the code standards. In summary, the 36-inch requirement strikes a balance between functionality and safety, making it the correct response.