How to legalize a patio, room or addition built without a permit
in Hialeah and Miami-Dade
In many cases, yes: you pull a permit for the work that already exists (an after-the-fact permit). Miami-Dade County states that permits may still be issued and inspections carried out for existing work done without a permit, although parts of the work may need to be uncovered so the inspector can verify it.
In practice that means filing as-built plans, paying for the permit —with an additional charge because work started without one— and passing inspections through close-out. Each municipality has its own building department: in Hialeah you file with the city; in unincorporated areas, with the County.
Step by step
- Confirm who handles your caseMiami-Dade has 35 municipalities, each with its own building official; the County handles unincorporated areas (folios starting with “30”). In Hialeah, the City's Building Department.
- Gather what already existsProperty survey, photos of the work and, if there is one, a copy of the violation. The County also accepts proof of when it was built (aerial photos, tax records or surveys).
- Prepare as-built plansThe County requires a new application with as-built plans: at minimum a site plan and floor plan, plus the structural, electrical, mechanical, plumbing and roofing detail that applies.
- Professional certificationTo legalize with the County, an As-Built Certificate from a Florida-licensed engineer or architect is required, explaining how the work was verified.
- File and pay for the permitThe Florida Building Code allows an additional fee when work started before the permit; in Miami-Dade, if there is a Notice of Violation for work without a permit, the “double fee” (100% extra) applies.
- Inspections and close-outThe inspector may require parts of the work to be uncovered. Once inspections pass, the permit is closed and the work is legal.
What the official sources say
- The Florida Building Code requires a permit to construct, enlarge, alter, repair or change the occupancy of a building (section 105.1). [1]
- Anyone who starts work before obtaining the permit pays an additional fee set by the building official (section 109.4). [1]
- Miami-Dade: “permits may still be issued, and inspections can still be carried out” for existing work done without a permit; it may need to be uncovered. [2]
- Miami-Dade: with a Notice of Violation for work without a permit, the permit carries a 100% additional charge (“double fee”). [2]
- Miami-Dade (Code Relief): as-built plans, an As-Built Certificate from a Florida-licensed engineer or architect, and proof of when the work was built. [3]
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Official sources
Checked on October 29, 2026. Rules change: always confirm with your city or the County. This guide is informational and is not legal advice.
- Florida Building Code 2023 (8th ed.), Building, Chapter 1
- Miami-Dade County · Homeowners General Permit Information
- Miami-Dade County · Code Relief
- Miami-Dade County · County Municipal Approval
- City of Hialeah · Building Department