What is the maximum allowable difference in tread depth within a flight of stairs?

The maximum allowable difference in tread depth within a flight of stairs is 3/8 inch. This standard is crucial for safety, as uneven treads can lead to trips and falls. Consistency in tread depth ensures that users can safely navigate the stairs without the risk of misstepping, which is particularly important for those with mobility issues or in low-light conditions. Building codes and safety regulations often specify this measurement to maintain uniformity and prevent accidents, thereby reinforcing the importance of adherence to these standards in home inspections and construction practices.