Mezzanine stair regulations vary by location and are typically governed by local building codes and safety standards. However, there are some general principles that are often considered in mezzanine stair design and construction. Stairs should meet specific dimensions and incline requirements to ensure safe and easy access. Handrails are commonly mandated for safety, with specifications regarding height and design. Additionally, load-bearing capacity, fire safety, and accessibility standards may also apply. For more accurate and up-to-date information, consult the local building authorities or regulatory bodies in your specific location.