Zoning Guide

Miami Setbacks & Height Limits — Miami 21 Transect Zones

Last updated: Verified:

Fact-checked against the current Miami 21 materials and Florida Statutes on September 20, 2026.

Miami uses the Miami 21 form-based code. Instead of conventional R-1/R-2 residential districts, Miami 21 organizes much of the city into transect zones. Setbacks, lot occupation, building configuration, and height must be checked for the exact transect and any Neighborhood Conservation District or other overlay.

T3 Sub-Urban Zone

The City's current Miami 21 T3 summary lists the following base standards:

Standard T3 Requirement
Minimum lot area 5,000 sq ft
Minimum lot width 50 ft
Principal-front setback 20 ft
Secondary-front setback 10 ft
Side setback 5 ft minimum and 20% of lot width total minimum
Rear setback 20 ft
First-floor lot coverage 50% maximum
Second-floor coverage, T3-R and T3-L 30% maximum
Green space 25% of lot area minimum
Principal-building height 2 stories and 25 ft to eave maximum

The previous version incorrectly described the T3 green-space requirement as 30%. The current City summary states 25%.

It also described Miami 21 height mainly as a story count. For T3, the City's current summary gives both a story limit and an absolute dimension: 2 stories and 25 ft to eave maximum.

T3-L Outbuildings

Miami 21 separately lists outbuilding setbacks for T3-L. The current T3 summary uses 20 ft principal front, 10 ft secondary front, 5 ft side, and 5 ft rear for the T3-L outbuilding standard.

Do not apply that 5-ft rear outbuilding rule to a principal T3 building.

T4, T5, T6, and Overlays

Higher-intensity transects use different disposition and height rules. Some use build-to requirements and adjacency standards instead of the T3 pattern. This page therefore does not extrapolate T3 dimensions to T4, T5, or T6 property.

Neighborhood Conservation Districts, historic districts, airport-related controls, waterfront conditions, and other overlays can also modify base standards.

Florida ADU Law Does Not Create a Statewide Mandate

The previous page incorrectly stated that Florida Statutes §163.31771 requires municipalities to allow ADUs in single-family zones.

The current statute says a local government may adopt an ordinance allowing accessory dwelling units in areas zoned for single-family residential use. Miami's local rules therefore must be checked directly; §163.31771 by itself is not a statewide by-right ADU mandate.

For local requirements, see the Miami ADU rules page and verify the current Miami 21 text.

How to Check a Property

  1. Find the parcel's current transect zone in the Miami 21 Zoning Atlas.
  2. Read the specific-to-zone standards for that transect.
  3. Check all NCD, historic, airport, waterfront, and other overlays.
  4. Distinguish the principal building from an outbuilding or other accessory structure.
  5. Confirm unusual conditions with the City of Miami Planning or Zoning staff.

Official Sources

This guide is informational only. Miami 21, mapped overlays, and parcel-specific conditions control. Verify current requirements before design, permitting, purchase, or construction decisions.

More about Miami Zoning

Building Permits — Cost & TimelineADU Rules in Miami, Florida

Sources

  1. City of Miami Planning Department·miami.gov·Accessed 2026-04-14·Direct link
  2. Miami 21 Zoning Code (Official)·miami.gov·Accessed 2026-04-14·Direct link
  3. Miami 21 Zoning Atlas·miami21.org·Accessed 2026-04-14·Direct link

FAQ

What are the setback requirements in Miami?
Miami uses a form-based code (Miami 21) rather than traditional Euclidean zoning. For T3-R (Sub-Urban Restricted) single-family zones, typical setbacks are approximately 20 ft front, 5 ft side (interior), and 20 ft rear. T4 Urban General zones have smaller setbacks tied to the build-to line. Always verify your specific Transect Zone on the Miami 21 Zoning Atlas before designing.
What is the maximum building height in Miami residential zones?
Miami 21 measures height in stories rather than feet. T3-R and T3-L allow up to 2 stories. T3-O allows up to 2 stories. T4 Urban General allows up to 3 stories. T5 Urban Center allows up to 5 stories, and T6 Urban Core can go much higher (8 to 80+ stories depending on the sub-zone). Confirm your zone on the Miami 21 Atlas.
How is Miami 21 different from traditional zoning?
Miami 21 is a form-based code that regulates buildings by their physical form and relationship to the street, using Transect Zones (T1 Natural through T6 Urban Core) instead of use-based R1/R2/C1 districts. Building disposition, height, and frontage type are set by the transect, not by a list of permitted uses alone.
Can open porches encroach into the required front setback in Miami?
Yes. Under Miami 21, open porches may encroach up to 8 ft into the required front setback in T3 zones. Other encroachments (eaves, chimneys, bay windows) have their own allowances. Always confirm with the Miami Zoning Office at (305) 416-1495.