What is the maximum depth of a tread stairs?

The maximum depth of a tread (the horizontal part of a stair) is typically governed by building codes, which can vary by region. Generally, the minimum depth for a residential stair tread is around 10 inches (25 cm), while the maximum depth can be about 12 inches (30 cm) to ensure safety and comfort. However, it's essential to check local building regulations for specific requirements in your area.