Fees
Estimated city fees
Baseline for a simple permitted hvac: $100–$300 estimated mechanical permit fees including state surcharges (varies by job valuation). An electrical sub-permit costs extra if circuit work is included
| Fee | Amount | Notes |
|---|---|---|
| Mechanical permit (HVAC replacement) | $100–$300 | Miami-Dade Building Department fees are based on job value (typically $4–$8 per $1,000 of equipment and installation cost). A typical 3-ton residential HVAC replacement valued at $6,000–$12,000 yields approximately $100–$200 in base permit fees. State surcharges and administrative fees bring the total to $100–$300. |
| DCA surcharge and state education surcharge | 1% of permit fee (minimum $2) | Florida Department of Community Affairs and state education surcharges are assessed on all permits in Florida. |
| Electrical sub-permit | $75–$200 | Required if the scope includes a new disconnect switch, circuit upgrade, or service-panel modification. Filed separately from the mechanical permit. |
| Inspections | Included | Rough-in inspection (before refrigerant charge and electrical enclosure) and final inspection are included under the mechanical permit. If new ductwork is in scope, submit duct-leakage test results before rough-in approval. |
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Conditions
The rules that apply
- A mechanical permit is required for any HVAC system replacement in Miami-Dade County, including central air conditioners, heat pumps, split systems, packaged units, and mini-split systems.
- A like-for-like replacement (same equipment type and capacity) follows the same permit pathway as a new installation. Miami-Dade has no exemption for residential HVAC replacement.
- All outdoor condensing units and rooftop packaged equipment must be anchored to withstand Miami-Dade's High Velocity Hurricane Zone (HVHZ) 175 mph (3-second gust) design wind speed. Equipment must carry a Miami-Dade Notice of Acceptance (NOA) or current Florida Building Code product approval (FL#) for the intended installation method.
- A separate electrical permit is required if the replacement involves a new or relocated disconnect switch, a new or upgraded circuit, or any service-panel modification. HVAC capacity increases commonly trigger a panel-amperage check.
- Manual J load calculations are required per the 2023 Florida Building Code, Mechanical (Section 302.1) for new equipment installations. Miami-Dade Climate Zone 1 (hot/humid) has extremely high latent cooling loads. Correct latent sizing controls indoor humidity and prevents mold.
- Duct leakage testing is required for new duct systems or significant duct modifications per 2023 FBC-Energy Section 405.3 (≤4 CFM25 per 100 sq ft of conditioned floor area). Replacing equipment on an existing, unmodified duct system does not trigger a new duct test unless the replacement opens, extends, or repairs the ducts.
Documents
What you'll need to file
- Completed Miami-Dade Building Department mechanical permit application submitted through the ePlan system.
- Scope of work description specifying the existing equipment (make, model, tonnage/BTU, refrigerant type) and proposed replacement equipment with model numbers.
- Equipment specification sheets and Miami-Dade NOA number or Florida product approval (FL#) for the condensing unit, confirming HVHZ wind-speed compliance for the anchoring method.
- Equipment data sheets demonstrating compliance with 2023 FBC-Energy minimum efficiency requirements for Climate Zone 1 (SEER2 ≥15.2, or current DOE regional minimum).
- Manual J load calculation report for new system installations or capacity changes, as required by FBC Mechanical Section 302.1.
- Duct-leakage test results if new ductwork or duct modifications are included in the scope.
- Electrical permit application and licensed electrical contractor information if disconnect, circuit, or panel work is included.
- Mechanical contractor's state-issued license number and Certificate of Insurance on file with Miami-Dade Building Department.
Process
How the permit process works
Each step must finish before the next one starts.
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Verify NOA or FL# for the replacement equipment Confirm that the proposed condensing unit has a current Miami-Dade Notice of Acceptance (NOA) or a current Florida product approval (FL#) that covers the planned HVHZ installation and anchoring method. Search NOAs at miamidade.gov/business/NOA.asp and FL approvals at floridabuilding.org. Plan review will reject an expired or non-HVHZ NOA.
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Prepare Manual J and equipment selection Miami-Dade's Climate Zone 1 has among the highest latent cooling loads in the United States. Average indoor relative humidity exceeds 70% from May through October without adequate dehumidification. Use a full Manual J calculation to size the replacement system for both sensible and latent loads. Oversized equipment in Miami short-cycles and cannot remove enough moisture.
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Submit permit application through ePlan Submit the mechanical permit application, equipment specifications, NOA documentation, and any required calculations through the Miami-Dade ePlan portal. If electrical work is included, submit the electrical sub-permit application at the same time. Plan review for a standard residential HVAC replacement typically takes 2–5 business days.
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Pay permit fee and post on site After plan review approval, pay the permit fee including state surcharges. Post the permit card at the job site before work begins.
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Schedule rough-in inspection Call for a rough-in inspection after the equipment is set and mechanically connected, but before the system is refrigerant-charged and electrical connections are enclosed. If new ductwork is in scope, submit and get approval of the duct-leakage test results before the rough-in inspection passes. The inspector verifies exterior condenser anchoring for HVHZ compliance at this stage.
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Complete installation and request final inspection After the system is fully installed, charged, and tested, request a final inspection. The inspector verifies equipment installation per 2023 FBC Mechanical. They also confirm NOA-compliant anchoring of outdoor equipment, check condensate drainage and trap depth, check refrigerant line insulation, and confirm electrical disconnect labeling. Final approval closes the permit.
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Provenance
Code basis & official sources
Last verified 2026-05-06.
2023 Florida Building Code (FBC) Mechanical, Chapter 3 (General Regulations, Section 302.1 equipment sizing), Chapter 6 (Duct Systems). 2023 FBC Energy Conservation Section 405 (duct leakage). Miami-Dade HVHZ amendments requiring NOA/FL# product approval for exterior HVAC equipment anchoring. Miami-Dade County Code Chapter 8 (Building).
Residential permit page: https://www.miamidade.gov/business/building-permit-application.asp
If you skip the permit
- Miami-Dade strictly enforces HVHZ equipment anchoring requirements, because an improperly anchored condenser unit can become a projectile in a hurricane. Unpermitted installation can result in stop-work orders and required removal.
- Unpermitted HVAC work can void homeowner's insurance coverage for equipment damage and any resulting water or property damage. That exposure is large in South Florida's frequent rain and storm season.
- Florida requires you to disclose unpermitted work at the time of sale. Unpermitted HVAC systems can delay closing, reduce appraised value, or require retroactive permitting that exposes connections for inspection.
- An improperly sized system in Miami's Climate Zone 1 that cannot adequately remove latent heat will cause chronic high indoor humidity, leading to mold growth and associated health and remediation costs.
- Unpermitted electrical work on the HVAC disconnect or circuit is a separate code violation with its own fines and corrective requirements.
FAQ
Common Miami hvac permit questions
Do I need a permit to replace my AC unit in Miami, FL?
Yes, always. Miami-Dade requires a mechanical permit for any HVAC equipment replacement, whether it's a like-for-like swap or a capacity change. The High Velocity Hurricane Zone (HVHZ) requirements mean Miami-Dade enforces HVAC permits more strictly than most Florida counties, particularly for outdoor unit anchoring.
What is the HVHZ requirement for HVAC equipment in Miami?
Miami-Dade is entirely within Florida's High Velocity Hurricane Zone (HVHZ), where all outdoor HVAC equipment must be anchored to withstand 175 mph design wind speeds. The condensing unit must have a Miami-Dade Notice of Acceptance (NOA) or Florida product approval (FL#) covering the anchoring method you're using. The inspector verifies anchor compliance at rough-in inspection. Equipment installed without NOA documentation present will fail inspection.
Is a Manual J load calculation required for HVAC replacement in Miami?
Yes, per 2023 Florida Building Code Mechanical Section 302.1. This matters most in Miami's Climate Zone 1, which has among the highest latent cooling loads in the continental U.S. An oversized system will short-cycle on sensible temperature and fail to remove adequate moisture, causing chronic high indoor humidity and mold risk. Your contractor must document the load calculation. Miami-Dade inspectors may request it at final inspection.
Does HVAC replacement in Miami require an electrical permit?
It depends on the scope. Swapping like-for-like equipment with no changes to the electrical disconnect, circuit, or panel requires only the mechanical permit. If the job involves a new disconnect, circuit upgrade, or panel modification, you also need a separate electrical permit pulled by a licensed electrician. That is common when upsizing systems. Miami-Dade Building may cross-reference the electrical permit status during mechanical final inspection.
Does Miami require a duct-leakage test for HVAC replacement?
Only if the replacement adds new ductwork or materially modifies existing ducts. Swapping equipment on an existing, unmodified duct system does not trigger a new leakage test. For new duct sections, Miami-Dade enforces the 2023 FBC-Energy requirement of ≤4 CFM25 per 100 sq ft of conditioned floor area, verified at rough-in inspection. Given Miami's high humidity, many contractors seal leaky existing ducts during equipment replacement to reduce latent load and mold risk.
How much does an HVAC permit cost in Miami?
Expect $100–$300 in total Miami-Dade permit fees for a typical residential HVAC replacement, including state surcharges. Fees are based on job value (approximately $4–$8 per $1,000 of equipment and installation cost). A $8,000 replacement generates roughly $100–$150 in base fees plus surcharges. Add $75–$200 for an electrical sub-permit if disconnect or circuit work is included. Inspections are included in the mechanical permit fee.
Do heat pumps require a different permit than central air conditioners in Miami?
No. A heat pump replacement follows the same mechanical permit pathway as a central A/C replacement. The same rough-in and final inspections apply, and the outdoor unit still requires an HVHZ-compliant NOA for anchoring. Miami's Climate Zone 1 suits heat pumps. Winters are mild enough that heat pumps provide all heating needs efficiently, and FPL and other utilities offer heat pump rebates.
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Disclaimer: Informational only, not legal advice. Rules change. verify with Miami permitting staff before you build.