PLAIN ANSWERThey can add separate review, design limits, elevation documents or approvals even when the base project uses a simple trade permit.Local rules vary. The linked official examples support the workflow, not a nationwide yes/no answer.
A safe way to handle it
1
Check the legal parcel in official maps.
2
Identify exterior, equipment-location and structural impacts.
3
Obtain overlay approval before relying on an exemption or quick permit.