TL;DR
The authority having jurisdiction, or AHJ, is the organization or official with legal power to enforce a code and approve or reject work under it, most often the municipal or county building department, plus the fire marshal, health department, or utility for their domains. The phrase appears throughout the model codes precisely because enforcement is local: the same NEC line can be interpreted differently across a city boundary.
What it means
The authority having jurisdiction, or AHJ, is the organization or official with legal power to enforce a code and approve or reject work under it, most often the municipal or county building department, plus the fire marshal, health department, or utility for their domains. The phrase appears throughout the model codes precisely because enforcement is local: the same NEC line can be interpreted differently across a city boundary. The AHJ issues permits, performs inspections, and can grant alternatives or modifications to prescriptive rules. When a contractor says the city wants it this way, this is who they mean.
Where it sits in the glossary
Authority having jurisdiction is part of the Permits group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.