Question

for which of the following are separate mechanical, electrical, and plumbing plans commonly required?
larger buildings
permitting purposes
single - story buildings
small residential structures

Explanation:

Larger buildings have more complex systems. Mechanical (like HVAC), electrical, and plumbing systems in larger buildings are intricate. Separate plans help in clear design, installation, and compliance. Permitting might need some plans but not always separate for these three in all cases. Single - story and small residential structures usually have simpler systems that can often be combined or don't require highly detailed separate plans.

Answer:

larger buildings