Yes. A new, permanently installed mini split generally requires a mechanical permit in Miami-Dade County. New or altered electrical work usually requires an electrical permit too. Apply through the building department responsible for your property, and obtain the required approvals before installation starts.
For an exact replacement, unincorporated Miami-Dade County allows an electrical permit exemption when the equipment has the same electrical amperage, but its current guidance still requires a mechanical permit. Do not treat replacing an existing system as an automatic exemption from all permits.
Research checked: October 4, 2026. Requirements depend on the property, jurisdiction, and scope of work. Confirm your installation with the local building department before ordering equipment or scheduling work.
What permit does your mini split project need?
Use this table to identify the questions to ask before installation. It is a planning guide; your building department determines the permits for your address.
| Project | What to confirm |
| First mini split in a bedroom, office, or other existing room | Mechanical permit and any permit for new electrical work |
| Replacing an existing mini split | Mechanical permit; whether the exact-changeout electrical exemption applies |
| Adding another indoor head or moving equipment | Permit coverage for the altered mechanical system and any electrical changes |
| Adding a circuit, disconnect, or panel work | Electrical permit requirements for that scope |
| Installing a DIY or precharged system | Required permits, installer eligibility, and refrigerant-work requirements |
| Cooling a garage | HVAC permits and a separate check of the garage’s approved use |
| Installing in a condo | Government permits plus any association or building-management approvals |
Miami-Dade’s permit application guidance identifies new mechanical air-conditioning work as permit-required work. A ductless design does not remove that requirement. The installation still introduces permanently mounted equipment, refrigerant piping, drainage, and electrical connections.
Did Florida’s 2026 small-project exemption remove mini split permits?
No. The small-project exemption does not cover mechanical or electrical work.
Miami-Dade’s current guidance describes new exemptions effective July 1, 2026 for certain home improvement projects valued below $7,500. It expressly excludes mechanical and electrical work. Florida Statute 553.79 also states those exclusions.
A mini split costing less than $7,500 does not qualify for this exemption simply because of its price. The type of work matters.
There is another threshold that can cause confusion: the county’s guidance describes a Notice of Commencement exception for repair or replacement of an existing heating or air-conditioning system valued below $7,500. A Notice of Commencement is a separate document. An exception from that filing does not remove the mechanical permit requirement.
Ask the permit office to confirm both issues for your project: which permits you need and whether a Notice of Commencement is required. A new installation and a replacement may receive different treatment.
Should you apply to Miami-Dade County or your city?
Apply to the building department with jurisdiction over the property. A Miami mailing address alone does not identify that department.
The county’s application instructions apply to unincorporated Miami-Dade properties with folio numbers beginning with “30.” Properties within a municipality fall under that city’s Building Official for building permits.
That distinction matters for addresses in the City of Miami, Miami Beach, Hialeah, Doral, Coral Gables, and other municipalities. They are within Miami-Dade County, but their application processes and fees may differ.
Before requesting a quote, collect your street address and property folio. Ask:
- Which department issues the mechanical permit for this address?
- Is the electrical work a separate permit or part of a larger project?
- Does the scope require plans or another review?
For projects elsewhere in South Florida, use that property’s local authority. Do not assume the Miami-Dade process applies in Broward or Palm Beach County.
Which permits and approvals might be involved?
Mechanical permit
The mechanical permit covers the HVAC scope. Miami-Dade’s mechanical permit guidance explains the application, mechanical category, and fee-sheet requirements. Categories marked as needing processing require plans for review.
Describe the actual project: a new single-zone installation, a system replacement, a multi-zone addition, or equipment relocation. “Install AC” may not give the reviewer enough information to understand the proposed work.
Electrical permit
Confirm electrical permitting whenever the installation introduces or changes a circuit, disconnect, wiring, or panel equipment. Review the county’s electrical permit guidance if the property is in unincorporated Miami-Dade.
Have the contractor identify who will perform and permit that work. An HVAC equipment quote should explain whether electrical labor and permit handling are included.
Other approvals
A rooftop location, new support structure, wall opening, or larger renovation may raise questions beyond the HVAC equipment itself. Ask whether structural, roofing, zoning, historic-preservation, or floodplain review applies to the proposed location.
For a condominium, ask management about exterior equipment, common walls, drainage, access, and working hours before finalizing the layout. Treat association approval and government permitting as separate steps.
Do you need a permit to replace an existing mini split?
Plan for a mechanical permit. Confirm any electrical exemption against the exact replacement scope.
The county’s current permit exemption page distinguishes an exact AC changeout with the same electrical amperage from new electrical work. It explicitly retains the mechanical permit requirement.
Give your contractor the existing and proposed model numbers. Ask them to compare the electrical specifications and identify any wiring, circuit, or disconnect changes. Matching BTU ratings alone does not establish an electrical exemption.
Older online PDFs may describe AC changeouts differently. Use current guidance and obtain confirmation for your address rather than relying on an old document or a verbal claim that “replacements never need permits.”
Limited component repairs can qualify for separate exemptions. Replacing an entire indoor-and-outdoor system is a different scope from repairing a component inside existing equipment.
Can you install a DIY mini split without a permit?
No. DIY branding does not create a permit exemption.
A product may simplify assembly while the installation still requires local permits. Check three separate issues: who may hold the permit, who may perform the electrical work, and who may make the refrigerant connections.
Miami-Dade offers an owner-builder permit route for qualifying owners. Its residential guidance describes personal ownership, use or occupancy restrictions, and owner validation. Do not assume a rental property, condo, or company-owned property qualifies.
Refrigerant certification is a separate federal issue. In its answer about installing an R-410A mini split, the EPA states that adding or removing refrigerant and connecting or disconnecting hoses or precharged lines requires Section 608 certification. Precharged lines alone are not proof that certification is unnecessary.
Before purchasing a DIY package, ask a qualified contractor and your building department to review the exact model and installation tasks. Get the installation responsibilities in writing.
Can you put a mini split in a Miami-Dade garage?
A garage mini split generally needs the applicable HVAC permits. Its approval does not by itself authorize a bedroom, apartment, or rental conversion.
Describe how you intend to use the garage when discussing the project with the building department. Cooling an existing workspace and creating residential living space raise different questions.
Before choosing equipment, ask whether the proposed use requires additional building or zoning approval. Include any changes to doors, walls, windows, electrical outlets, or plumbing in that discussion. A broader renovation should not be presented as only an AC installation.
For the cooling design, start with the room’s actual load. Our guide to choosing the right mini split size explains why floor area alone is an incomplete starting point. Share the garage’s construction, insulation, windows, and intended use with the HVAC professional.
What should you prepare before applying?
Prepare a clear scope and the exact equipment details, then request the checklist for your project type.
A useful planning packet includes:
- Property address, folio, and owner information.
- Contractor details or owner-builder eligibility information.
- Existing equipment details if replacing a system.
- Proposed indoor and outdoor model numbers.
- A sketch showing equipment locations and piping routes.
- Electrical-work description and equipment specifications.
- Proposed condensate drain destination.
- Outdoor pad, bracket, or stand details.
- Sizing and energy documentation requested by the reviewer.
- Any required association or related project approvals.
The county’s residential mechanical plan-review guidelines address equipment sizing, installation, piping, and energy-code issues. Ask which documents apply to your installation; a replacement and a larger remodel can have different submission needs.
For multiple rooms, confirm the manufacturer approves the complete indoor-and-outdoor combination before submitting it. Our guide to mixing wall-mounted, cassette, floor, and concealed units explains that equipment-matching step.
How much does a mini split permit cost in Miami-Dade?
There is no single permit price that applies to every mini split project across the county and its cities.
The county’s posted mechanical fee sheet, checked October 4, 2026, lists a $233.82 minimum mechanical permit fee. That is a mechanical minimum, not a complete project total or a quote for municipal permits. Confirm the applicable fees when you apply.
Request a quote that separates:
- Government permit fees.
- Contractor application and coordination charges.
- Plans or design documentation.
- Electrical work and associated fees.
- Other applicable reviews or inspections.
Keep these costs separate from the equipment price so you can compare proposals. Our single-zone versus multi-zone cost guide provides context for comparing the wider installation scope.
How long does permit approval take?
Approval depends on the authority, submission completeness, and required reviews. Do not treat an application receipt as permission to start.
Confirm whether your project needs plan review or qualifies for a contractor trade-permit process. Ask the installer to distinguish submission, permit issuance, installation, and inspection dates when discussing the schedule.
Missing equipment data, unclear locations, or changes after submission can interrupt the planned timeline. Agree on the layout and model numbers before applying, and ask how revisions will be handled if the design changes.
What will inspectors check?
Expect inspection of the permitted installation and its applicable mechanical and electrical requirements.
Miami-Dade’s mechanical inspection checklist addresses equipment access, mounting and restraint, wind resistance, piping insulation, condensate drainage, and other installation details. It includes a drain check-valve or trap provision for condensate-producing ductless mini splits.
Ask the contractor which inspections apply and when work must remain exposed. Make sure the inspector can reach the equipment and view the required documents.
A ceiling installation also deserves an early access discussion. Our concealed ducted versus ceiling cassette comparison explains the layout and service-access questions to resolve before closing a ceiling.
Save the permit number, inspection results, equipment records, and confirmation that the permit has been closed.
What happens if the system was installed without a permit?
Contact the building department about correcting the permit status. A working air conditioner does not establish approval.
Unpermitted work can lead to extra fees and a requirement to bring the installation into compliance. The county’s mechanical fee sheet warns of double fees for work performed without a permit. Municipal enforcement procedures can differ.
The City of Miami Beach’s building FAQ describes obtaining permits and inspections to legalize work, with correction or removal when construction does not comply. It also identifies potential property-sale issues.
Collect the installer invoice, model numbers, photographs, and any existing application records. Ask what the authority needs to evaluate the work. Do not assume an after-the-fact application guarantees approval.
Questions to ask your installer before signing
Use these questions to make the installation quote easier to evaluate:
- Which department has jurisdiction over my address?
- Who will obtain the mechanical and electrical permits?
- Are government fees and permit-handling charges included?
- What documents support any claimed exemption?
- Who will handle the electrical and refrigerant work?
- Which inspections are included, and who handles corrections?
- Will you provide the final approvals and permit-closeout record?
Verify the contractor through the Florida DBPR license search. Check that the business and license information match the proposal, and ask for insurance documentation.
Plan your system before installation starts
Confirm your permitting authority, room loads, equipment combination, electrical scope, and installation layout before purchasing a system. Then ask your installer for a written permit and inspection plan.
Contact My Mini Split to discuss equipment options and model documentation for your project. Your local building department determines the required approvals for your property.
Frequently asked questions
Does a small 9,000 BTU mini split need a permit?
Yes, a new permanently installed system generally needs a mechanical permit. A small BTU rating alone does not create an exemption.
Do precharged mini splits need permits?
Yes. Precharged equipment does not remove local permit requirements. Confirm installer eligibility and refrigerant-work requirements for the exact system.
Does replacing a mini split require an electrical permit?
It depends on the scope. Unincorporated Miami-Dade allows an electrical exemption for an exact AC changeout with the same electrical amperage. The mechanical permit still applies.
Can I use the county process for a City of Miami property?
Confirm the property’s jurisdiction first. The county’s published application process is for unincorporated Miami-Dade; municipal properties use their city’s building department.
Does an AC permit make my garage a legal bedroom?
No. Cooling-system approval does not by itself authorize a change in the garage’s approved use. Ask about the complete conversion before starting work.
Should I keep the inspection records?
Yes. Keep the permit number, final inspection approvals, equipment details, and permit-closeout confirmation with your property records.