Direct answer
Yes, for a central A/C replacement in unincorporated Miami-Dade. The County’s permit exemption page says an exact change-out of air conditioning equipment with the same electrical amperage does not need an electrical permit, but it does need a mechanical permit. Replacing a window A/C unit is on the County’s list of exempt work. Florida’s small-job permit exemption does not cover mechanical work. If the property is in a city, ask that city’s building department.
Disclaimer
This article is general information about permitting and code-enforcement processes. It is not legal advice, not a substitute for advice from a Florida-licensed attorney, and not a guarantee of any result, timeline, or fee. Permit Busters, LLC is not a law firm and does not appear as your legal representative. Building and code rules vary by county and municipality and can change. Confirm current requirements, forms, and fees with the building or code office that has jurisdiction over the property, and consult a Florida attorney and, where construction work is required, a Florida-licensed contractor.
Este artículo es información general sobre procesos de permisos y cumplimiento del código. No es asesoramiento legal, no sustituye el consejo de un abogado con licencia en Florida y no garantiza un resultado, un plazo ni un costo. Permit Busters, LLC no es un bufete de abogados y no comparece como su representante legal. Las normas de construcción y de código varían según el condado y el municipio y pueden cambiar. Confirme los requisitos, formularios y tarifas vigentes con la oficina de construcción o de código que tenga jurisdicción sobre la propiedad, y consulte a un abogado de Florida y, cuando se requiera obra, a un contratista con licencia en Florida.
First, confirm whether the County or a city issues the permit
Miami-Dade County handles buildings in unincorporated areas, where folio numbers begin with 30. Each municipality in the County has its own building official, so a property in a city goes to that city. See Which Department Issues Your South Florida Permit.
What the County says about A/C work
Miami-Dade’s Permit Exemptions page, for unincorporated Miami-Dade, sorts A/C work into a few groups:
- Exact central A/C change-out. The change-out of air conditioning equipment of the same electrical amperage does not need an electrical permit, but the County says a mechanical permit is required.
- Window A/C units. Replacing a window air conditioning unit is on the County’s list of permit-exempt work for single-family homes, duplexes, townhouses, and condominium units. That list has a cap on the total cost of the listed work in any 12-month period.
- Repairs inside the equipment. When done by a licensed air conditioning or mechanical contractor, the County lists repair of A/C ducts, and repair or replacement of the coil, compressor, or refrigerant piping inside the equipment, as exempt.
- New systems or changes. The County’s “How to Apply” page says permits are required for any new plumbing, electrical, or mechanical air conditioning work.
The same page explains Florida’s newer small-job exemption, which began July 1, 2026, for some work valued under $7,500 on eligible homes. The County says mechanical, electrical, plumbing, structural, and gas work always require permits, even under that amount.
How a County mechanical permit is filed
Miami-Dade’s Mechanical Permits page says applicants:
- Complete the Building Permit Application (yellow form) and select the permit type and the mechanical category.
- Submit a Mechanical Fee Sheet with the application.
- Submit plans for review if the fee sheet category says “needs processing.”
The County’s E-Permitting system lets qualified contractors apply for stand-alone mechanical permits, pay, and print permit cards online. Owner-builders who qualify can apply, and the County requires an owner-builder validation, in person or virtually, before the permit is issued.
Inspections
Miami-Dade publishes Mechanical Inspection Guidelines and a checklist. They cover items such as condensate drain lines and equipment anchoring. Ask your contractor which inspections are on your permit card, and keep the card until the final is approved.
Notice of Commencement and HOA review
- Notice of Commencement. Section 713.135(1)(e) of the Florida Statutes requires the permit applicant to file a copy of the recorded Notice of Commencement with the building department before the first inspection when the direct contract is greater than $5,000. Section 713.135(1) also says those permit-office requirements do not apply to a direct contract to repair or replace an existing heating or air-conditioning system for less than $15,000. That A/C figure has been $15,000 since July 1, 2022. Miami-Dade’s How to Apply page uses the current $5,000 and $15,000 figures, but its Owner-Builder page still lists the older $7,500 A/C figure, so confirm what the department asks for on your permit. Questions about whether to record a notice for your job, and about construction liens, should go to a Florida attorney.
- HOA review. Section 720.3035(1)(b)2 of the Florida Statutes says an HOA may not require review of plans for a central air-conditioning system if it is not visible from the frontage, an adjacent parcel, common area, or a community golf course, and is substantially similar to a system the association has approved or recommended. HOA approval is the client’s responsibility.
Get help with a Miami-Dade A/C permit
Permit Busters, LLC can help homeowners and contractors confirm which office issues the permit, prepare the mechanical application, and track it through inspections. See residential permits, the Miami-Dade permit help page, and city pages for Miami, Hialeah, and Doral. Approval always rests with the city or county. Call (954) 616-5823, email info@permitbusters.com, or book an appointment. Hours are Monday through Friday, 9 AM to 5 PM. Permit Busters, LLC is based in Lauderhill, FL 33351.
FAQ
Do I need a permit to replace my central A/C in Miami-Dade?
In unincorporated Miami-Dade, yes. The County says an exact change-out of air conditioning equipment of the same electrical amperage does not need an electrical permit, but does need a mechanical permit. In a city, ask that city’s building department.
Do I need a permit to replace a window A/C unit?
Miami-Dade lists replacement of a window air conditioning unit among permit-exempt work for single-family homes, duplexes, townhouses, and condominium units in unincorporated areas, subject to the County’s cap on the total cost of listed work.
Does the under-$7,500 permit exemption cover A/C replacement?
No. Florida’s exemption does not apply to mechanical, electrical, plumbing, structural, or gas work, and Miami-Dade says those types of work always require permits.
Can a homeowner pull an A/C permit in Miami-Dade?
A qualifying owner-builder can apply in unincorporated Miami-Dade, and the County requires an owner-builder validation, in person or virtually, before the permit is issued. Owner-builder rules have limits, so read the County’s disclosure statement first.
Do I need a Notice of Commencement for an A/C replacement?
For a direct contract to repair or replace an existing heating or air-conditioning system for less than $15,000, Florida law says the building department’s Notice of Commencement copy requirement does not apply. Above that amount, a copy of the recorded notice is generally due before the first inspection. Some County pages still show the older $7,500 figure, so confirm with the department that issues your permit, and ask a Florida attorney about lien questions. This is general information, not legal advice.