Building permits across most of Miami County come from Miami County Building Regulations, a division of the county Department of Development, at 1506 One Stop Court in Troy. The division serves the county’s cities as well as its villages and townships, so Troy, Piqua and Tipp City file here too. Miami County borders Montgomery County, home of Dayton, and the Great Miami River runs through Piqua and Troy.
This guide covers the department and how to reach it, the local conditions that shape a filing here, what permits cost and who may pull them, and how inspections are booked. Rules that apply everywhere in Ohio are summarized in each section, with a link to the full statewide explanation.
This guide covers the areas the county department serves: Troy, Piqua, Tipp City, Bradford, Casstown, Covington, Fletcher, Pleasant Hill, West Milton and all twelve townships for commercial and residential work, and Laura and Ludlow Falls for commercial work only. The Miami County parts of Huber Heights and Union are served by those cities’ departments.
Two separate flood regimes can apply near the Great Miami River. The Miami Conservancy District, built after the 1913 flood, runs five dry dams and levees at Piqua and Troy; its permits apply to land it owns or controls and to building in its flood storage basins upstream of the dams. Floodplain development elsewhere is regulated under the county’s flood damage reduction resolutions. Check both against the parcel before design.
What requires a building permit in Miami County?
Under the Ohio Building Code and the Residential Code of Ohio, a permit is required for most construction activity.
Permit required
- New residential and commercial construction, additions, alterations and conversions
- Structural and load-bearing work, foundations, decks, porches, ramps and stairs
- Finishing basements and attics, and any change of occupancy or use
- Electrical service changes, panel work, new circuits, solar and EV charging equipment
- Plumbing alterations, repipes, water heaters, backflow and sewer or gas connections
- HVAC installation and change-out, ductwork and venting; reroofing, siding, windows, pools and signs
Typically exempt
- Painting, wallpapering, tiling, carpeting and cabinet installation
- Minor repairs that do not cut away walls, touch structural supports or change the means of egress
- Fences up to 6 feet at houses (7 feet under the Ohio Building Code) and retaining walls up to 4 feet that support no surcharge
- One-story detached sheds and playhouses up to 200 square feet at houses (120 square feet under the Ohio Building Code)
The exempt list is set statewide in Section 102.10 of the Ohio Building Code and the Residential Code of Ohio, and an exemption from a building permit is not an exemption from zoning, setbacks, floodplain rules, utility approval or a fire authority review. Confirm scope with the department before work starts rather than after.
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Get a free quote →Which code edition applies
Miami County Building Regulations enforces the statewide Ohio codes, so the technical standard is the same as elsewhere in Ohio. Fees, submittal processes, zoning, inspection scheduling and any additional local regulations are what a department sets locally.
Permits in Miami County are governed by Ohio’s statewide codes: the Ohio Building Code for commercial and other nonresidential buildings, and the Residential Code of Ohio for detached one-, two- and three-family dwellings. The Ohio Building, Mechanical and Plumbing Codes in force since 1 March 2024 are based on the 2021 International Codes; the Residential Code of Ohio is the 2019 edition, based on the 2018 International Residential Code; both use the 2023 National Electrical Code. Only departments certified by the Ohio Board of Building Standards may approve plans, and residential rules are uniform statewide. How Ohio’s statewide code works
Who handles permitting in Miami County?
Permits are issued by the certified department with authority over the address. Zoning is a separate approval: the Department of Development’s Planning and Zoning division handles county-administered zoning, and elsewhere the township or municipality does.
| Detail | Information |
|---|---|
| Authority | Miami County Building Regulations |
| Offices | 1506 One Stop Court, Suite 6, Troy, Ohio 45373 |
| Phone | 937-440-8121 |
| Serves | All twelve townships; Troy, Piqua, Tipp City and six villages; Laura and Ludlow Falls for commercial work only |
| Separate departments | None of the county’s own cities; the Miami County parts of Huber Heights and Union go to those cities’ departments |
| Site constraints | Floodplain under the county’s flood damage reduction resolutions; Miami Conservancy District permits on its land and storage basins |
| Confirm the department | Use the BBS building-department lookup before filing |
| Code | Ohio Building Code on the 2021 International Codes (since 1 March 2024); Residential Code of Ohio, 2019 edition on the 2018 IRC; 2023 NEC |
| Contractor credentials | OCILB licence for commercial electrical, HVAC, hydronics, plumbing and refrigeration work; any local licence or registration the department requires |
In Laura and Ludlow Falls the county handles commercial work only, and the Board of Building Standards data shows no residential department there; in Potsdam it shows none for either. Houses there need no state or county building permit, and commercial plans in Potsdam go to the state (ORC 3791.04).
Not sure this scope needs a permit?
Get a free quote →On unsewered parcels the board of health must approve the sewage treatment system after a site evaluation (ORC 3718.02), and a new private well needs a board of health permit (OAC 3701-28-03). Resolve both before a layout is fixed.
One point applies across every Ohio jurisdiction and is worth confirming rather than assuming. Residential rules are uniform statewide: a local code may differ from the Residential Code of Ohio only on subject matter the state code does not address, or after review by the Board of Building Standards (ORC 3781.10, 3781.01). Municipalities may add nonresidential regulations that do not conflict with the state rules. Ask the issuing department whether any local regulation affects your project type.
In 2025, building permits issued in unincorporated Miami County authorized 340 new privately owned housing units, 290 of them single-family homes, according to the U.S. Census Bureau Building Permits Survey.
Zoning is a separate approval, and often a separate office
Zoning is a separate approval, and a department may require it before it accepts the building application. Establish with Miami County Building Regulations which approvals must be complete before it will accept yours.
The Ohio Board of Building Standards certifies which departments may enforce the code, and for which buildings; the certified department’s political subdivision sets fees, and zoning is a separate approval. Where no certified department has jurisdiction, nonresidential plans go to the state, while houses need no plan submission. The Board’s building-department look-up shows which department has authority over an address. Who has authority in Ohio
Permit types
Residential permits
One-, two- and three-family dwellings follow the Residential Code of Ohio. Residential service changes and new services need a drawing for review before the service permit is issued.
Commercial permits
Commercial buildings, and multifamily buildings of four or more units, follow the Ohio Building Code, and submittals come through the architect of record.
Two statewide topics shape most Ohio submittals: energy compliance (the 2021 IECC or ASHRAE 90.1-2019 for commercial buildings, Chapter 11 of the Residential Code of Ohio for houses) and work on existing buildings, where alteration, repair, addition and change of occupancy each carry their own requirements. Energy and existing buildings in Ohio
Miami County permit costs and fees
Fees are set by whichever certified department issues the permit, and a Board of Building Standards assessment of 3 percent of nonresidential and 1 percent of residential fees is added (ORC 3781.102).
Rather talk it over?
Call 1-855-478-4290 →| Fee component | How it works |
|---|---|
| Plan review | Charged under the issuing department’s adopted schedule |
| Building permit | Set by the issuing certified department's adopted fee schedule |
| Trade permits | Electrical, plumbing and mechanical work is charged under the issuing department’s schedule |
| State BBS assessment | Collected on top of local fees for the Board of Building Standards: 3% of nonresidential and 1% of residential fees (ORC 3781.102) |
| Certificate of Occupancy | A separate fee where applicable |
| Work without a permit | Orders, including stop-work orders, and prosecution (OBC and RCO Section 109) |
Need a real number for a specific Miami County project? Send us the scope, address and valuation and we will identify the filing path, the reviews it will trigger and the fee categories that will apply.
Fee schedules are revised on each jurisdiction’s own cycle, so ask the issuing department for the schedule in force on your filing date, and ask separately about plan review, trade, re-inspection and revision charges. A Board of Building Standards assessment of 3 percent (nonresidential) or 1 percent (residential) is added to local fees. How Ohio permit fees work
Trade permits and who may pull them
Permit required
- Service installations, panel upgrades, new circuits, solar PV and EV chargers
- New plumbing, repipes, water heater change-outs, fixtures, backflow and gas piping
- HVAC installation and change-out, ductwork, venting and commercial kitchen exhaust
- Sprinkler, standpipe and fire alarm work under the OBC fire-protection provisions
Typically exempt
- Replacing lamps, reinstalling plug receptacles and replacing circuit breakers of the same capacity and type in the same location
- Clearing stoppages and repairing leaks, where no more than one fixture is replaced and no pipes are rearranged
- Replacing a mechanical-equipment part that does not alter the equipment’s approval or make it unsafe
- Replacing a minor gas-appliance part that does not alter the equipment’s approval or make it unsafe
Rather not deal with the Miami County building department?
Get a free quote →Ohio licenses five commercial trades statewide through the Ohio Construction Industry Licensing Board: electrical, HVAC, hydronics, plumbing and refrigeration. The state does not license general or residential contractors, so those are licensed or registered locally, if at all. Home construction contracts of $25,000 or more must be in writing under ORC 4722. Contractor licensing in Ohio
How to apply for a Miami County building permit
Both are administered separately from the permit.
That person submits every plan, as one multipage PDF.
It takes e-plans and inspection requests and shows invoices.
The board of health approves on-site sewage systems (ORC 3718.02).
Use the BBS lookup; certification does not follow from the type of local government.
Zoning is a separate approval; ask the department whether it must come first.
Approved plans become invalid if work has not started within twelve months, with one twelve-month extension available. Before filing, confirm the department has authority over the address for the work, whether the Ohio Building Code or the Residential Code of Ohio governs, and which approvals must be in hand first. Review and corrections in Ohio
Inspections in Miami County
Schedule inspections with the certified department that issued the permit. The building official lists the required inspections when the plans are approved (OBC and RCO 108.2); they include foundation, framing, rough-in trades, insulation and energy, and final, with a Certificate of Occupancy required before legal occupancy of new or changed-use space.
Request inspections through the division’s online customer portal. The division gives each project its own list of required inspections.
No building may be occupied until a certificate of occupancy or completion is issued, and a change of occupancy needs approved construction documents even without other work. Address correction notices before requesting a re-inspection, and do not cover work before it has been inspected and approved. Inspections and occupancy in Ohio
Miami County permit search and official resources
Permit records sit with the department that issued them, which in Ohio makes record research a certification question first. A property may have records with a municipal department, a county department, a township department or the state, depending on who held authority at the time the work was done — and that can have changed if a department gained or gave up certification, or if the property was annexed. If you are buying, refinancing or renovating, ask Miami County Building Regulations what it holds for the parcel and whether earlier records may sit elsewhere.
Want this handled start to finish?
Get a free quote →The Board's building-department lookup helps here too: it establishes who has authority today, which is the right starting point even when the history is more complicated.
Confirm two things before you file: the code, and the department. The Ohio Building Code has been based on the 2021 International Codes since 1 March 2024, the Residential Code of Ohio is the 2019 edition based on the 2018 International Residential Code, and both use the 2023 National Electrical Code — but the department with authority over your address, and the scope of its certification, is the answer that changes from parcel to parcel. Use the Board's building-department lookup, then confirm fees, submittal requirements and review turnaround with that department for your filing date.
These are the primary sources behind this guide. Codes, fee schedules and portal procedures change. Confirm the position for your filing date.
- Miami County Building Regulations
- Ohio Board of Building Standards
- BBS — find the building department for your address
- Ohio Construction Industry Licensing Board
- ORC Chapter 4722, home construction service contracts
Frequently asked questions
What is the conservancy system?
The Miami Conservancy District’s flood protection system, built after the 1913 flood: five dry dams and levees in the river cities, including Piqua and Troy. Its permits apply to land it owns or controls and to structures over 100 square feet, RV use or more than 100 cubic yards of fill in its storage basins upstream of the dams. They are separate from the building permit.
Inspections are where schedules slip.
Get a free quote →Do Troy, Piqua and Tipp City issue their own permits?
No. Miami County Building Regulations handles commercial and residential work in all three cities.
How do I know which department issues my permit?
Use the Board of Building Standards building-department lookup, which maps an address to the department with authority over it. Only a BBS-certified department, or the state, may approve plans and issue permits, and certification does not follow automatically from being a city, county or township.
Does my project fall under the OBC or the RCO?
Commercial, industrial and public buildings follow the Ohio Building Code. One-, two- and three-family dwellings follow the Residential Code of Ohio. Ohio’s residential code reaches three-family dwellings, where the International Residential Code stops at two.
What if no certified department serves the area?
The Division of Industrial Compliance performs commercial plan review and inspection where no certified department serves. Residential code enforcement, however, is carried out only by certified local departments, so the fallback is commercial-only.
Does my general contractor need an Ohio licence?
There is no statewide general-contractor licence in Ohio. The state licenses five commercial trades through the OCILB — electrical, HVAC, hydronics, plumbing and refrigeration — while general contractors, and trade contractors on residential work, are licensed or registered only where a local government requires it. Home construction and improvement contracts of $25,000 or more on one-, two- and three-family dwellings must be in writing under ORC 4722, and the supplier must carry at least $250,000 of general liability insurance.
Simplify Miami County permitting with Alliance Permitting
In Miami County we settle two things first: the flood position on river parcels, and a residential submittal that meets the one-PDF rule.
Trusted by leading builders, developers, and national contractors — 21+ years of filing in the jurisdictions we write about.
Contractors and builders choose Alliance for Miami County because the work is done by people who have stood at the counter:
- We establish flood and conservancy position before design on river parcels.
- We assemble residential plans into the single PDF the division requires.
- We submit and track through the division’s online customer portal.
- We resolve rural sewage, water and access before layout.
- We clear zoning with the township or municipality separately.
Alliance Permitting is a permit documentation and submission company in Ohio. We prepare your paperwork, file it correctly and coordinate with the building department through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.
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Let Alliance prepare, file, and track your Miami County permits while your crew stays on the job.
More Ohio permitting guides
This guide is provided by Alliance Permitting for general information about Miami County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.