This checks on-premise wall signs in Miami commercial transect zones. Hurricane wind-load engineering, special sign packages, and historic districts route to a pro.

Your Miami business address

Planned sign area (sq ft)

Illumination type

Your street frontage (ft)

The width of your lot/tenant space along the street. Your total sign allowance is this × a district multiplier.

Why Miami signs get rejected

Miami uses a Transect Zone system (T4, T5, T6 and so on) instead of conventional commercial zones. For commercial transects, your wall sign scales with your building frontage up to a hard cap of 300 sq ft per frontage. Residential-tier transects (T5-R, T6-R) are capped far tighter. Table 15 also caps how wide a wall sign may be, as a share of your linear frontage rather than of the wall, and the share differs by transect — read your own transect row before you fix the width. Flashing signs are restricted.

This tool reads the same zoning rules the Department of Buildings enforces and tells you where your plan stands before you pay for fabrication or file a permit.

Miami sign allowance by district

Maximum total on-premise sign area. "Mult" = multiply by your street frontage in feet; cap is the hard ceiling.

Transect	Max wall sign area	Flashing
T4 / T5 / T6 (commercial)	frontage × ratio, max 300	Restricted
T5-R / T6-R (residential)	40 sq ft cap	Restricted
CS (civic space)	25 sq ft cap	Restricted
D (industrial)	frontage × ratio, max 300	Restricted

Source: Miami 21 Code Article 10, Table 15. Wall signs capped at 300 sq ft per frontage (40 for T5-R/T6-R), with a width cap set as a share of linear frontage that varies by transect. Illumination limited to ~0.3 foot-candles above ambient.

How to apply for a Miami sign permit

Miami runs two tracks that are easy to confuse: the zoning area check, and the structural engineering the Florida Building Code requires before anything goes up.

1. Pull your Transect Zone

The multiplier and the hard cap both come from the transect — a commercial T4/T5/T6 storefront scales with frontage, residential-tier zones are capped tight.

2. Apply the multiplier to your street frontage

Then check the result against the cap for your zone, which is the hard ceiling regardless of frontage.

3. Get the wind-load engineering

The Florida Building Code requires exterior signs to be engineered for hurricane wind loads. That structural review is separate from the area check and is required before installation.

4. File online and line up a licensed installer

Miami’s permitting is fully online. Installation must be done by a licensed, insured contractor, illuminated signs need a separate electrical permit, and signs in historic-preservation or special-district areas add Planning/Hearing Board review.

Steps assembled from the confirmed items on this page. Fees and what drives the schedule are covered in "Cost, timeline & temporary banners" below — not repeated here.

Questions owners ask

What's a Transect Zone?

Miami 21 replaced traditional zones with Transect Zones (T3–T6) describing how urban an area is. Your sign code is found at gis.miamigov.com or the Miami 21 Atlas. T6 is the urban core; T4 is general urban; -R suffixes are residential.

What about hurricane wind load?

Florida Building Code requires exterior signs to be engineered for hurricane wind loads. That structural review is separate from this area check and is required before installation.

Is there a width limit as well as an area cap?

Yes. Table 15 sets a width cap for wall signs as a share of your linear building frontage, and the share is written per transect rather than as one citywide figure — so read the row for your own transect. It is a share of frontage, not of the wall itself.

Is this an official ruling?

No. This is a first-pass risk filter on public zoning data, not a permit and not legal advice. Final area and wind-load engineering are confirmed by a licensed Miami sign professional.

Cost, timeline & temporary banners

What does a Miami sign permit cost?

The City of Miami sets sign-permit fees by sign type — some are charged per square foot and some as a flat amount per sign. We publish no figures here, because a stale fee is worse than none and miami.gov refused our requests for its building-permit fee pages. Confirm the current schedule with the City of Miami Building Department before you file. Illuminated signs need a separate electrical permit. Installation must be done by a licensed, insured contractor. Always check the current City of Miami Building Permit Fee Schedule, since the portal calculates the exact fee.

How long does approval take?

The city publishes no review or processing time for sign permits, so this page gives no number. Miami's permitting is fully online, and the shape of the process is what to plan around rather than a week count: a first plan review, then however many correction cycles your drawings draw, then final issuance. Signs in historic-preservation or special-district areas add Planning/Hearing Board review on top.

Can I hang a "Grand Opening" banner first?

Grand Opening and special-event signs require their own Special Event / Grand Opening sign application and permit — they're not automatically allowed. Small window signs under 25% of the glass and very small temporary signs (often under 6 sq ft) are typically exempt, but a banner promoting your opening usually is not.

Source: City of Miami (Sign Code FAQ; Building Permit Fee Schedule; Miami 21 Zoning Code Article 10); Miami-Dade sign permit procedures. Fees and timelines change — confirm current figures with the City of Miami before filing.

Sources and official references: Miami 21 Zoning Code, Article 10 — Signage (PDF). Measured on 21 August 2026: the code PDF extracts as text and carries the area and coverage figures quoted on this page. The frontage-coverage percentage is stated in the district tables rather than the article text, so it is not matched by automated collection.

Last inspected against the official code: June 2026 · confirm current rules with the city before you file