Which factor is NOT typically considered when determining the type of plumbing fixtures to install in a residential building?

The choice of color preference for fixtures is generally less critical in the overall planning and installation of plumbing fixtures in a residential setting. While aesthetic considerations, including color, can influence the selection process, they do not impact functionality, safety, or compliance with building codes, which are paramount in plumbing design.

In contrast, factors such as the size of the room help determine the dimensions and style of fixtures that will fit appropriately, ensuring adequate space and accessibility. The number of occupants directly affects how much plumbing capacity is necessary in terms of water supply and drainage requirements, influencing decisions on the number and type of fixtures. The cost of materials plays a key role in determining the specific fixtures that can be installed within the budget constraints of the project, impacting the overall design and installation process.

Therefore, while color preference is a subjective and personal choice that can enhance the visual appeal of plumbing fixtures, it does not carry the same weight as the other more practical and functional factors involved in their selection and installation.