Is a floor or landing always required on each side of a door?

A floor or landing is indeed generally required on each side of a door in most construction standards and building codes. This requirement helps ensure safety and accessibility. Landings provide a flat surface that allows for safe entry and exit through the door, reducing the risk of tripping hazards that can occur when there is a change in elevation or when a door swings open directly into a stairwell or other uneven surfaces.

The presence of a landing helps ensure that individuals using the door have a stable area to stand on when the door is opened, making it easier to navigate through the space. This applies to various types of buildings, including residential, commercial, and public facilities. Therefore, the correct answer reflects the fundamental requirement for safety around door systems in building construction.