What is the maximum difference in riser heights on stairs?

The maximum difference in riser heights for stairs is typically set by building codes, which often require that all risers in a flight of stairs be uniform within a specified tolerance. Generally, this allowable variation is around 3/8 inch (9.5 mm). This ensures safety and comfort for users, as significant differences can lead to tripping hazards. Always consult local building codes for specific regulations in your area.