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AHJ (Authority Having Jurisdiction)

Also called: building department · building official

The organization or official with legal authority to enforce building regulations on a project: usually a municipal or county building department, and often several authorities at once, such as a fire marshal, a health department, or a state agency.

Related: Plan check (plan review) Jurisdiction Digital permitting

Architects Jurisdictions Owners & developers

Why it matters

The AHJ determines which code editions and amendments apply, reviews submissions at plan check, issues corrections, inspects construction, and grants the approvals a project needs to proceed. For architects, the AHJ is the reader the drawing set must ultimately satisfy, which is why understanding how your AHJ reviews is as important as understanding what the code says.

Often confused with

  • Code-writing body. The AHJ mostly does not write the code. Bodies like the ICC write model codes; the AHJ adopts, amends, and enforces them.

Common question

Does the AHJ write the building code?

Mostly no. The AHJ adopts a model code written by a body like the ICC, amends it for local conditions, and enforces the result through plan check and inspection.

Also in Fundamentals: Building code IBC (International Building Code) ICC (International Code Council) Jurisdiction Local amendments Occupancy classification Egress (means of egress) Fire-resistance rating

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