Which of the following is NOT part of the plumbing code requirements for toilets in a building?

The correct choice is artistic design, as it is not a requirement regulated by plumbing codes. Plumbing codes focus on practical aspects that ensure safety, functionality, and accessibility in plumbing installations. Accessibility features serve to guarantee that plumbing fixtures are usable by individuals of varying abilities, while floor spacing addresses the layout and arrangement of fixtures to ensure they meet health and safety standards. Pipe diameter is crucial for maintaining appropriate water flow and pressure throughout the plumbing system.

In contrast, artistic design pertains to aesthetic preferences rather than functional or compliance aspects. Thus, it does not fall under the mandatory requirements dictated by plumbing codes, which are primarily concerned with the operational integrity and user safety of the plumbing systems in a building.