Now the answer above is just from the legal perspective.
I actually wrote an article regarding this topic a year and half ago (time flies!). A few stuff is outdated but you might still find it somewhat interesting:
link
Sorry but I am not too familiar with the requirement of other states. But according to
this article posted in 2012:
- IL - SE required for all structures
- HI - SE required for all structures. Hawaii statutes require the seal of a licensed SE on construction documents in order to obtain a building permit
- CA - SE required for public schools and hospitals
- NV - SE required for structures requiring special expertise, such as radio towers and signs over 100 feet, and buildings more than three stories or 45 feet in height.
- OR - SE required for certain buildings and structures (Oregon statutes require the S.E. license for hazardous facilities, special occupancy structures, essential facilities over 4,000 square feet in ground area or 20 feet in height, structures with irregular features, and buildings over four stories or 45 feet in height)
- UT - SE required for complex structures.
- WA - SE required for “significant structures (tall buildings, long bridges, hazardous facilities, essential facilities, hospitals and air traffic control towers (e.g., Washington statutes require the S.E. license for hazardous facilities, essential facilities over 5,000 square feet in ground area and 20 feet in height, structures exceeding 100 feet in height, buildings of five or more stories, bridges with a total span of more than 200 feet, piers with a surface area greater than 10,000 square feet, and structures where more than 300 people congregate in one area)
Which state are you practicing engineering?