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BlogMiami County, OH Building and Trade Permit Guide
Miami County, OH Building and Trade Permit Guide
Francis Thumpasery
Last updated:
Jun 20, 2025
In construction, time is money — and permits are often what stand in the way of keeping projects on track. Whether you're a builder breaking ground on a new subdivision, a GC remodeling commercial space, or a trades contractor upgrading HVAC or electrical systems, pulling permits in Miami County, Ohio is part of the process. But that doesn’t mean it should slow you down.
This guide lays out exactly what you need to know to keep your projects moving: Which permits are required, how much they cost, where to apply, and what to expect from inspections — across residential, commercial, and trade work.
Simplify permitting in Miami County, OH with PermitFlow. Learn more here.
What requires a building or trade permit in Miami County, Ohio?
Miami County permits are required for most new construction and structural modifications. This includes residential, commercial, and trade-specific work.
Common projects that require a permit include:
- Building or structural work: Erecting, constructing, enlarging, repairing, improving, altering, covering, extending, moving, or removing any building or structure
- Decks: Adding a deck if any part is 30 inches or more above grade
- Deck covers: Installing a roof or cover over any deck, regardless of height
- Electrical: Installing, modifying, or repairing any electrical wiring or equipment
- Plumbing/gas/sanitary: Work on plumbing, water supply, or gas systems
- HVAC/boilers: Installing, altering, or repairing boilers, pressure vessels, furnaces, or heat-producing piping
- Awnings and signs: Erecting, remodeling, repairing, altering, or removing any sign or awning
- HVAC and refrigeration: Installing, altering, or repairing air‑conditioning, refrigeration, or similar systems
- Pools: Installing a swimming pool
What doesn’t require a permit?
Some minor work doesn’t require a permit. This includes:
- Minor repairs & general maintenance: Basic upkeep that doesn't include structural, mechanical, electrical, or plumbing changes
- Small roofing work: Repairing or replacing a roof on sheds or other structures under 200 sq. ft
- Communication line installations: Installing telephone or similar communications utilities
For more information, please refer to the county’s Do I Need a Permit? page.
Who oversees permits in Miami County?
In Miami County, permits for construction and remodeling projects in unincorporated areas are overseen by the Miami County Department of Development. The Miami County Planning & Zoning Department also reviews planning-related permits and applications.
Miami County building permit fees
Permit fees vary based on project type, size, and estimated value. The fees also depend on the approval type. Here’s what you have to know.
Residential fees
Residential building (complete)
| Scope / Size |
Fee |
| 0–500 sq ft (new dwellings, additions, alterations) |
$300 |
| 501–1,500 sq ft |
$500 |
| Over 1,500 sq ft |
$0.34 /sq ft |
Approval type 1B: Building only (no mechanical)
| Scope / Size |
Fee |
| 0–500 sq ft |
$250 |
| 501–1,500 sq ft |
$450 |
| Over 1,500 sq ft |
$0.32 /sq ft |
Approval type 1C: Mechanical only
| Scope / Size |
Fee |
| 0–1,000 sq ft |
$200 |
| 1,001–3,000 sq ft |
$350 |
| Over 3,000 sq ft |
$500 |
Approval type 2A: Accessory with electric/mechanical
| Scope / Size |
Fee |
| 0 – 1,000 sq ft |
$300 |
| 1,001 – 3,000 sq ft |
$550 |
| Over 3,000 sq ft |
$700 |
Approval type 2B: Accessory without elec/HVAC
| Scope / Size |
Fee |
| 0 – 1,000 sq ft |
$200 |
| 1,001 – 3,000 sq ft |
$450 |
| Over 3,000 sq ft |
$600 |
For more information, refer to Residential Building Permit Fees (Pages 1 and 2).
Commercial fees
| Fee category |
Details |
Fee |
| Plan Review |
Hourly rate |
$120/hr |
| Resubmittals |
Additional plan submissions |
$50 each |
| Structural Fee Processing |
Base processing for structural permits |
$302.50 |
| Structural Square Footage |
Per 100 sq ft (rounded up) |
$11.55 per 100 sq ft |
| Roof Replacement |
Flat/membrane roof only |
$275 |
| In-ground Pools |
Includes plan review |
$660 + plan review |
| Mechanical Processing Fee |
Base processing for HVAC mechanical permits |
$302.50 |
| Gas Line Inspection |
Flat fee |
$165 |
For more information, check out the Commercial Permits page.
Miami County trade permits
Plumbing permits
Plumbing work in Miami County — such as new installations, water heater replacements, and drain system updates — typically requires a plumbing permit. Licensed contractors must submit detailed plans and will need to undergo inspections at the rough-in and final stages.
Miami County plumbing permit costs
| Item |
Cost |
| Basic Permit |
$45 |
| Fixture/Trap |
$17 each |
| Irrigation Fee |
$40 |
| Backflow Permit |
$25 |
| Plumbing Special Inspection |
$125 |
| Reinspection Fee |
$50 |
| Penalty Fee |
+25% surcharge |
For more information, check out the Miami County plumbing permit fee page.
Electrical permits
An electrical permit is required for new service panels, rewiring, lighting upgrades, and EV charger installations.
Miami County electrical permit costs
| Item |
Cost |
| Processing Fee |
$302.50 |
| Reconnect, Sub-panels, Temp Pole (commercial) |
$165 each |
| Reconnect, Sub-panels, Temp Pole (residential) |
$150 |
| Alarm System Device |
$7.15 |
| Service Over 400 amps |
$330 |
| Service Over 600 amps |
$55 for each 100 Amps |
| Service Only – 400 amps or less (residential) |
$150 |
| Service Only – over 400 amps (residential) |
$200 |
More information can be found on the Residential and Commercial pages.
Roofing permits
Roof replacements generally require a permit, especially when structural decking or support systems are being replaced.
Miami County roofing permit costs
| Item |
Cost |
| Roof Replacement (commercial) |
Membrane/Flat Roof: $275 |
Roofing information is only available for commercial buildings, which can be found on the Commercial building permit fees page.
HVAC permits
Permit applications are required for HVAC installs, replacements, and system extensions. Ductwork modification and installation of new heating or cooling units also fall under this category.
Miami County HVAC permit costs
| Item |
Cost |
| HVAC Mechanical Processing (commercial) |
$302.50 + $7.15 /100 sq ft |
| Unit Heater Installation |
$165 for 1st unit; $55 each additional |
| Gas Line Inspection |
$165 (commercial); Residential: $150 |
Managing trade permits doesn’t have to be a hassle. PermitFlow simplifies the process — learn more.
How to pull building permits in Miami County, OH
Step 1: Gather your documentation
Before applying, prepare:
- Site plan or construction drawings
- Scope of work and project valuation
- Contractor license details (if applicable)
- Trade-specific specs (electrical load, plumbing fixture counts, HVAC system data)
Step 2: Submit your application
Apply in person at the Miami County Department of Development or via their official website. Submit application via:
Note: You will be charged 2.65% processing fee ($2.00 fee minimum).
Step 3: Wait for review
Permits undergo code compliance and zoning checks. Plan for a few business days to a few weeks, depending on project complexity.
Step 4: Pay fees
Once approved, you’ll receive an invoice for permit fees. Payment is typically required before issuance.
Step 5: Schedule inspections
Most permits require inspections at key stages — framing, rough-in, final, etc. To schedule an inspection, call the office at (937) 440-8121.
Miami County permitting resources
Simplify permitting in Miami County with PermitFlow
Getting a Miami County, OH building permit can be overwhelming, especially if your business just expanded into the area. Why spend hours figuring out county zoning rules, gathering paperwork, and navigating different township requirements?
Let PermitFlow handle the permit process for you.
PermitFlow is permit management software that handles permit preparation, submission, and tracking across all municipalities you serve, including Miami County.
Builders and contractors choose PermitFlow for:
- Expert guidance: Our team understands Miami County’s permitting process inside and out, so your applications are accurate and complete
- Centralized permit management: Keep all your projects organized and in one place, no matter how many jurisdictions you're working in
- Faster approvals: We get it right the first time, helping you avoid costly delays and resubmissions
Don’t let permit delays stall your next job. Contact us to see how we can help with your next project in Miami County — or wherever your business grows.
In construction, time is money — and permits are often what stand in the way of keeping projects on track. Whether you're a builder breaking ground on a new subdivision, a GC remodeling commercial space, or a trades contractor upgrading HVAC or electrical systems, pulling permits in Miami County, Ohio is part of the process. But that doesn’t mean it should slow you down.
This guide lays out exactly what you need to know to keep your projects moving: Which permits are required, how much they cost, where to apply, and what to expect from inspections — across residential, commercial, and trade work.
Simplify permitting in Miami County, OH with PermitFlow. Learn more here.
What requires a building or trade permit in Miami County, Ohio?
Miami County permits are required for most new construction and structural modifications. This includes residential, commercial, and trade-specific work.
Common projects that require a permit include:
- Building or structural work: Erecting, constructing, enlarging, repairing, improving, altering, covering, extending, moving, or removing any building or structure
- Decks: Adding a deck if any part is 30 inches or more above grade
- Deck covers: Installing a roof or cover over any deck, regardless of height
- Electrical: Installing, modifying, or repairing any electrical wiring or equipment
- Plumbing/gas/sanitary: Work on plumbing, water supply, or gas systems
- HVAC/boilers: Installing, altering, or repairing boilers, pressure vessels, furnaces, or heat-producing piping
- Awnings and signs: Erecting, remodeling, repairing, altering, or removing any sign or awning
- HVAC and refrigeration: Installing, altering, or repairing air‑conditioning, refrigeration, or similar systems
- Pools: Installing a swimming pool
What doesn’t require a permit?
Some minor work doesn’t require a permit. This includes:
- Minor repairs & general maintenance: Basic upkeep that doesn't include structural, mechanical, electrical, or plumbing changes
- Small roofing work: Repairing or replacing a roof on sheds or other structures under 200 sq. ft
- Communication line installations: Installing telephone or similar communications utilities
For more information, please refer to the county’s Do I Need a Permit? page.
Who oversees permits in Miami County?
In Miami County, permits for construction and remodeling projects in unincorporated areas are overseen by the Miami County Department of Development. The Miami County Planning & Zoning Department also reviews planning-related permits and applications.
Miami County building permit fees
Permit fees vary based on project type, size, and estimated value. The fees also depend on the approval type. Here’s what you have to know.
Residential fees
Residential building (complete)
| Scope / Size |
Fee |
| 0–500 sq ft (new dwellings, additions, alterations) |
$300 |
| 501–1,500 sq ft |
$500 |
| Over 1,500 sq ft |
$0.34 /sq ft |
Approval type 1B: Building only (no mechanical)
| Scope / Size |
Fee |
| 0–500 sq ft |
$250 |
| 501–1,500 sq ft |
$450 |
| Over 1,500 sq ft |
$0.32 /sq ft |
Approval type 1C: Mechanical only
| Scope / Size |
Fee |
| 0–1,000 sq ft |
$200 |
| 1,001–3,000 sq ft |
$350 |
| Over 3,000 sq ft |
$500 |
Approval type 2A: Accessory with electric/mechanical
| Scope / Size |
Fee |
| 0 – 1,000 sq ft |
$300 |
| 1,001 – 3,000 sq ft |
$550 |
| Over 3,000 sq ft |
$700 |
Approval type 2B: Accessory without elec/HVAC
| Scope / Size |
Fee |
| 0 – 1,000 sq ft |
$200 |
| 1,001 – 3,000 sq ft |
$450 |
| Over 3,000 sq ft |
$600 |
For more information, refer to Residential Building Permit Fees (Pages 1 and 2).
Commercial fees
| Fee category |
Details |
Fee |
| Plan Review |
Hourly rate |
$120/hr |
| Resubmittals |
Additional plan submissions |
$50 each |
| Structural Fee Processing |
Base processing for structural permits |
$302.50 |
| Structural Square Footage |
Per 100 sq ft (rounded up) |
$11.55 per 100 sq ft |
| Roof Replacement |
Flat/membrane roof only |
$275 |
| In-ground Pools |
Includes plan review |
$660 + plan review |
| Mechanical Processing Fee |
Base processing for HVAC mechanical permits |
$302.50 |
| Gas Line Inspection |
Flat fee |
$165 |
For more information, check out the Commercial Permits page.
Miami County trade permits
Plumbing permits
Plumbing work in Miami County — such as new installations, water heater replacements, and drain system updates — typically requires a plumbing permit. Licensed contractors must submit detailed plans and will need to undergo inspections at the rough-in and final stages.
Miami County plumbing permit costs
| Item |
Cost |
| Basic Permit |
$45 |
| Fixture/Trap |
$17 each |
| Irrigation Fee |
$40 |
| Backflow Permit |
$25 |
| Plumbing Special Inspection |
$125 |
| Reinspection Fee |
$50 |
| Penalty Fee |
+25% surcharge |
For more information, check out the Miami County plumbing permit fee page.
Electrical permits
An electrical permit is required for new service panels, rewiring, lighting upgrades, and EV charger installations.
Miami County electrical permit costs
| Item |
Cost |
| Processing Fee |
$302.50 |
| Reconnect, Sub-panels, Temp Pole (commercial) |
$165 each |
| Reconnect, Sub-panels, Temp Pole (residential) |
$150 |
| Alarm System Device |
$7.15 |
| Service Over 400 amps |
$330 |
| Service Over 600 amps |
$55 for each 100 Amps |
| Service Only – 400 amps or less (residential) |
$150 |
| Service Only – over 400 amps (residential) |
$200 |
More information can be found on the Residential and Commercial pages.
Roofing permits
Roof replacements generally require a permit, especially when structural decking or support systems are being replaced.
Miami County roofing permit costs
| Item |
Cost |
| Roof Replacement (commercial) |
Membrane/Flat Roof: $275 |
Roofing information is only available for commercial buildings, which can be found on the Commercial building permit fees page.
HVAC permits
Permit applications are required for HVAC installs, replacements, and system extensions. Ductwork modification and installation of new heating or cooling units also fall under this category.
Miami County HVAC permit costs
| Item |
Cost |
| HVAC Mechanical Processing (commercial) |
$302.50 + $7.15 /100 sq ft |
| Unit Heater Installation |
$165 for 1st unit; $55 each additional |
| Gas Line Inspection |
$165 (commercial); Residential: $150 |
Managing trade permits doesn’t have to be a hassle. PermitFlow simplifies the process — learn more.
How to pull building permits in Miami County, OH
Step 1: Gather your documentation
Before applying, prepare:
- Site plan or construction drawings
- Scope of work and project valuation
- Contractor license details (if applicable)
- Trade-specific specs (electrical load, plumbing fixture counts, HVAC system data)
Step 2: Submit your application
Apply in person at the Miami County Department of Development or via their official website. Submit application via:
Note: You will be charged 2.65% processing fee ($2.00 fee minimum).
Step 3: Wait for review
Permits undergo code compliance and zoning checks. Plan for a few business days to a few weeks, depending on project complexity.
Step 4: Pay fees
Once approved, you’ll receive an invoice for permit fees. Payment is typically required before issuance.
Step 5: Schedule inspections
Most permits require inspections at key stages — framing, rough-in, final, etc. To schedule an inspection, call the office at (937) 440-8121.
Miami County permitting resources
Simplify permitting in Miami County with PermitFlow
Getting a Miami County, OH building permit can be overwhelming, especially if your business just expanded into the area. Why spend hours figuring out county zoning rules, gathering paperwork, and navigating different township requirements?
Let PermitFlow handle the permit process for you.
PermitFlow is permit management software that handles permit preparation, submission, and tracking across all municipalities you serve, including Miami County.
Builders and contractors choose PermitFlow for:
- Expert guidance: Our team understands Miami County’s permitting process inside and out, so your applications are accurate and complete
- Centralized permit management: Keep all your projects organized and in one place, no matter how many jurisdictions you're working in
- Faster approvals: We get it right the first time, helping you avoid costly delays and resubmissions
Don’t let permit delays stall your next job. Contact us to see how we can help with your next project in Miami County — or wherever your business grows.
