Administrative overview · FIPS 39107
Mercer County permit authority
The first compliance decision is jurisdictional: identify the office with statutory authority over your parcel, then use its filing and inspection sequence to keep the project moving.
Jurisdictional status
State Fallback
This profile identifies a handoff outside the county’s ordinary structural permitting lane.
Required jurisdiction check
Confirm the controlling local or state authority before filing.
The record is marked State Fallback. That means the county profile should be treated as a routing brief: incorporated municipalities, a state building department, or a state fire marshal may control plan review, permits, and inspections. Contact the named agency below and verify the parcel’s jurisdiction before paying a fee or scheduling field work.
Responsible agency
Ohio Division of Industrial Compliance; Mercer County Planning Commission for zoning
For a project in or near Mercer County, this office is the identified point of contact for permit intake, statutory code enforcement, plan review coordination, and inspection release conditions. Confirm the parcel’s boundary and project type before relying on the county lane.
Direct contact
Ohio Division of Industrial Compliance 614-644-2223; Mercer County Planning Commission 419-586-3178
Call before mobilizing if the project has a boundary, occupancy, fire, septic, or utility question.
Permit counter
Mercer County Planning Commission, 220 W Livingston Street, Suite A212, Celina, OH 45822; state building office address N/A
Operating hours
Mercer County Planning Commission follows county office hours; the county publishes Monday 8:30 AM-5:00 PM and Tuesday-Friday 8:30 AM-4:00 PM. State fallback office hours N/A.
Review expectation
Ask the agency for its current review estimate
Compliance workbench
Choose the next project decision.
Apply online
Open the verified digital gateway, application form, and review timeline.
Open guide →Fees & penalties
Understand fee schedules, enforcement exposure, and stop-work liabilities.
Open guide →Codes & exemptions
Read the code framework, minor-work exemptions, and inspection lane.
Open guide →Agency website
Visit the primary public source for current notices and contact changes.
Open guide →Source trail
Official sources for this profile
Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.
Project questions
Frequently asked questions for Mercer County
Who handles permitting for this jurisdiction?
This record is marked State Fallback. Confirm whether a city, state agency, or other local authority controls the parcel before filing.
How should I begin an application?
No verified online portal was located in the reviewed public materials. Contact Ohio Division of Industrial Compliance 614-644-2223; Mercer County Planning Commission 419-586-3178 and request the current application route before preparing a final submittal.
How long might review take?
A typical review timeline was not verified. Ask the agency for its current completeness and review estimate.
How are inspections scheduled?
N/A for a countywide building inspection schedule. Commercial and other Ohio Building Code work must be coordinated with the State of Ohio or the applicable municipal building authority; contact 614-644-2223 for state-jurisdiction instructions. County zoning questions go to the Planning Commission at 419-586-3178.
Which codes and exemptions should I review?
Applicable current Ohio Building Code and Residential Code of Ohio requirements administered by the State of Ohio. The located Mercer County government directory contains no county building department, and Ohio state permitting applies to commercial work; current statewide references are the 2024 Ohio Building Code and current Residential Code of Ohio. The county zoning code provides an agricultural-use exception: no zoning certificate is required for agricultural buildings or structures incident to agricultural use, except in a platted subdivision of 15 or more lots of one acre or less. This is a zoning exception, not a blanket building-code exemption; state and municipal requirements may still apply.