Welcome to ECN.
Here in NJ there are a few "rules":
Single family resi renovation or "minor" work, drawings/sketch by homeowner is acceptable, if homeowner is also the resident.
New construction resi is architect/engineer.
Comm/industrial is architect/engineer.
Signed & sealed prints and specs, 2 or 3 sets, varies by town.
For electrical & plumbing, drawings are acceptable w/calcs and specs from lic. contractors in "Class 2" towns only.
"Class 1" towns, ALL drawings/specs must be signed/sealed by engineer or architect.
The definitions of the town "classes" are involved and cannot be condensed to post here. If you want the details, please e-mail me, and I will respond.