For most substantial construction projects in Florida, yes.
A Notice of Commencement is a legal document recorded in the county's public records that identifies important project information, including the property owner, contractor, and construction location.
For typical private construction projects exceeding $5,000, an NOC is generally required, subject to statutory exceptions and special thresholds. It must be recorded and properly posted before the first inspection, as applicable.
The NOC is also important because it establishes notice under Florida's construction lien laws.