AHJ (Authority Having Jurisdiction)
The agency with legal authority to enforce a code on a specific project. For a single commercial permit there is usually one AHJ for the building (the city or county building department), a separate AHJ for fire (the fire marshal), and additional AHJs for health, environmental, and right-of-way work. The AHJ writes the conditions, signs the permit, and conducts inspections.
Multi-jurisdiction programs interact with dozens of AHJs simultaneously, each with its own intake standards and review interpretations.
