Administrative overview · FIPS 39109
Miami 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
County
This county profile is the primary starting point for unincorporated-area permitting.
Responsible agency
Miami County Department of Development, Building Regulations
For a project in or near Miami 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
937-440-8121 option 1
Call before mobilizing if the project has a boundary, occupancy, fire, septic, or utility question.
Permit counter
1506 One Stop Court, Suite 6, Troy, OH 45373
Operating hours
N/A; the county page lists the office address and contact but does not publish Building Regulations counter hours. County observed holidays are posted on the site.
Review expectation
Most residential applications are reviewed within 3–5 business days; commercial plan approvals generally take approximately 14–21 days. Footing/foundation partial permits are generally processed in 1–3 days.
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 Miami County
Who handles permitting for this jurisdiction?
Miami County Department of Development, Building Regulations is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.
How should I begin an application?
Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact 937-440-8121 option 1.
How long might review take?
Most residential applications are reviewed within 3–5 business days; commercial plan approvals generally take approximately 14–21 days. Footing/foundation partial permits are generally processed in 1–3 days.
How are inspections scheduled?
Use the online customer portal to request inspections and view invoices. The county provides a required-inspection list for each project. Questions and inspection coordination go to Building Regulations at 937-440-8121 option 1; plumbing is coordinated with Miami County Public Health at 937-573-3500 when applicable.
Which codes and exemptions should I review?
Commercial and four-family-or-more residential work: 2024 Ohio Building Code, 2024 Ohio Mechanical Code, 2023 NFPA 70 NEC, 2022 IECC/2019 ASHRAE 90.1, 2022 NFPA 72, 2022 NFPA 13, and applicable fuel-gas and flood-damage requirements. One-, two-, and three-family dwellings and accessories: 2019 Residential Code of Ohio, 2023 NFPA 70, 2018 IECC or RCO Chapter 11, 2018 IFGC, and county flood-damage regulations. General maintenance and repairs are listed as not requiring a permit; replacing a roof on a structure under 200 square feet and installing telephone communication utilities are also listed as no-permit work. The county notes that work may still need to comply with applicable codes and zoning. Minor damage may be repair-permit-exempt when the Building Regulations staff determines it is minor.