Miami, FL· Sign installation & permitting

Sign installation in Miami: how it really works.

The first Miami question isn't what your sign can be — it's whose Miami you're in. The City of Miami, unincorporated Miami-Dade County, and Miami Beach are three different permitting worlds with three different codes, and a street address alone doesn't tell you which one applies. What they share is the engineering reality underneath: all of Miami-Dade sits in Florida's High-Velocity Hurricane Zone, and sign structures here are designed for wind loads most markets never think about.

What makes Miami different

Three authorities, commonly confused: the City of Miami permits under the Miami 21 zoning code's Article 10 through its Building Department; unincorporated Miami-Dade County permits under County Code Chapter 33 with its own application categories; and Miami Beach is a separate city with its own code and land-use boards. Jurisdiction is the first survey question.
Hurricane-zone engineering is baseline: the High-Velocity Hurricane Zone provisions of the Florida Building Code govern sign structures county-wide, and in unincorporated Miami-Dade any sign over 24 square feet — wall or detached — requires calculations sealed by a registered engineer.
The county runs on a statutory clock: Miami-Dade must complete review of a sign permit application within 30 calendar days, and a failure to decide is a deemed denial that can be appealed (County Code §33-86).
The City of Miami regulates signs by transect zone with measured brightness: internally illuminated signs are capped at 0.3 footcandles above ambient (measured at a distance derived from the sign's area), with factory-preset manufacturer certification required, and roof signs and portable signs prohibited in all transects.
Grandfathering is weaker than buyers expect: Miami required legally built nonconforming freestanding signs to come down by 2019 under Article 10's amortization — an existing sign on a newly acquired property is not automatically a keepable sign.
In Miami Beach, every sign goes through design review or a certificate of appropriateness, billboards are banned citywide, and sign framework must be aluminum or a similar alloy.

Who permits what in Miami

Match the address to the authority first

City of Miami applications run through the iBuild portal with electronic plan review, against Miami 21 Article 10 and the property's transect zone. Unincorporated Miami-Dade routes applications by category (illuminated exterior signs draw zoning, building, structural, and electrical review together) with notarized owner and qualifier signatures. Miami Beach layers its land-use boards in front of the building permit.

Illuminated signs are separately permitted and inspected

In unincorporated Miami-Dade, electrically illuminated signs require a separate electric permit and inspection. In the City of Miami, illumination near residential transects can require a Warrant — a discretionary zoning approval — before the building permit conversation starts.

The typical permit process

01Confirm the jurisdiction — City of Miami, unincorporated county, or Miami Beach — before anything else; the codes, portals, and review bodies are different.
02City of Miami: apply through iBuild, upload plans for electronic review, and show compliance with Article 10's standards for your transect zone, including the brightness certification for illuminated signs.
03Unincorporated Miami-Dade: file the category-correct application with notarized owner and qualifier signatures, two sealed plan sets where engineering applies, and photos of the sign location.
04Miami Beach: clear Design Review Board or Historic Preservation Board review (as the address dictates) before the building permit.
05Schedule the inspections that apply — including the separate electrical inspection on illuminated work — and retain the engineering file; hurricane-season insurance and landlord requests for sign engineering are routine here.

Districts and overlays that change the rules

City of Miami historic properties (Chapter 23)

Signs on designated historic properties need a Certificate of Appropriateness under the city's historic preservation chapter before permitting proceeds.

Miami 21 transect zones

The transect functions as an overlay: in residential and several other transects, illuminated signs are allowed only by Warrant — a discretionary approval with its own clock.

Miami Beach historic districts

The Historic Preservation Board issues certificates of appropriateness in the Art Deco and other historic districts; outside them, the Design Review Board reviews. Either way, design review precedes the permit.

On timelines

Unincorporated Miami-Dade is the rare jurisdiction with a statutory answer: review must complete within 30 calendar days, with non-decision treated as a deemed (appealable) denial. The City of Miami and Miami Beach publish no equivalent sign-permit timelines — and on the Beach, the land-use board calendar in front of the permit is usually the real schedule driver.

What adds review, time, or cost

Wind-load engineering — sealed calculations at the county's 24-square-foot threshold, and HVHZ design loads under the Florida Building Code everywhere in the county.
Illumination — separate electric permit and inspection in the county; Warrant review near residential transects in the city; brightness certification under Miami 21.
Historic and design review — Chapter 23 certificates in Miami, HPB/DRB review in Miami Beach.
Multi-discipline county review — illuminated exterior signs in unincorporated Miami-Dade are reviewed by zoning, building, structural, and electrical together.
Nonconforming existing signage — Article 10's amortization means inherited signs may be removal obligations, not assets.

The City of Miami exempts small address, notice, and directional signs (2 square feet and under), masonry or bronze memorials and cornerstones, limited flags, vehicle signs, and routine copy changes on changeable-copy signs. Miami Beach similarly exempts official signage, small directional signs, copy changes, and certain temporary window signs. Coverage and size caps apply, and exemption from a permit never exempts a sign from the wind-load code.

How Signavero runs Miami

Signavero's Miami survey starts with jurisdiction and ends with wind: we resolve which of the three authorities owns the address, then spec and engineer the structure to HVHZ loads with the sealed calculations the county expects at its low threshold. One PM runs the iBuild, county, or Beach board track as one schedule — and the engineering file stays with your closeout, because in this market someone always asks for it later.

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Questions people ask

Which permit office covers our Miami location?

It depends on the municipal boundary, not the mailing address. The City of Miami, unincorporated Miami-Dade County, and Miami Beach each permit signs under different codes, portals, and review boards — and 'Miami, FL' addresses sit in all three. We resolve the jurisdiction during the survey, because every downstream step (engineering threshold, review bodies, timeline) changes with the answer.

What does the High-Velocity Hurricane Zone change about our signs?

Structure and paperwork. All of Miami-Dade falls in the Florida Building Code's High-Velocity Hurricane Zone, so sign structures are designed to wind loads far beyond most markets, and in unincorporated Miami-Dade any sign over 24 square feet needs calculations sealed by a registered engineer. Practically: heavier anchoring, engineered drawings as a default budget line, and an engineering file your landlord or insurer may ask to see.

We bought a property with an old freestanding sign. Can we keep using it?

Don't assume so in the City of Miami. Article 10's amortization required legally built nonconforming freestanding signs to be removed by 2019, so an inherited sign may be an obligation rather than an asset. A survey against the current code answers it definitively — and if the structure must go, reuse decisions (foundation, electrical) are worth making before the rebrand is designed.

Sources

Informational only, not legal advice. Sign codes, departments, and fees change — confirm current requirements with the local jurisdiction before you rely on them.

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