Final answer:
The required handrail heights on stairways are a minimum of 34 inches and a maximum of 38 inches, ensuring safety and adherence to building codes.
Step-by-step explanation:
The question relates to the requirements for handrail heights on stairways as prescribed by building codes. According to the International Residential Code (IRC) and the Americans with Disabilities Act (ADA) guidelines, the minimum height of handrails should be 34 inches, and the maximum height is 38 inches, measured vertically from the nosing of the stair treads. These requirements ensure safety and accessibility for individuals using the stairs.