Every component
deserves a clear scope.

Property context in Opa-locka

Miami-Dade County's permit exemption list states that repair of air conditioning duct is exempt from permit requirements regardless of the value of materials and labour when performed by a licensed mechanical contractor, and separately that changing out air conditioning equipment of the same electrical, cooling or heating capacity does not need an electrical permit but that a mechanical permit is required for the change out. That list carries an update date and says it applies to unincorporated Miami-Dade County. Cleaning is not the same thing as duct repair or equipment replacement, so ask a provider which category the proposed work falls into. Confirm the address and the proposed scope with your own city, because Miami-Dade County states that each municipality has its own building official who issues permits within that city limits.

Miami-Dade County's mechanical permits page tells applicants to check its permit exemption information to verify whether a mechanical building permit is required, and says a completed building permit application and a mechanical fee sheet must be submitted as part of an application, with plans submitted for plan review where a category indicates it needs processing. The page itself does not list which mechanical work is covered. Ask the department covering your address whether the proposed duct work counts as exempt repair or as permitted work before it starts.

Area-wide context is not a finding about your own property.