ADU Rules & Zoning in Miami-Dade (Unincorporated), Florida (2026)

Updated with 2026 Florida SB-48 Codes

What ADU can you build in your Miami-Dade (Unincorporated) backyard?

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Miami-Dade (Unincorporated) 2026 ADU Requirements Snapshot

Best-available AI-generated operating guidance; verify with planning department before final permit decisions.

Download full city guideLast updated: 2026-03-12
Zoning allowanceMiami-Dade guidance indicates ADUs are allowed in single-family zoned districts as attached, detached, or conversion units, with district-specific constraints.
Size limitsSize limits vary by district and ordinance context; use city/county code sections for final constraints.
Lot + setbacksRU-1 references include minimum lot area context (7,500 sq ft) and district-specific setback handling.
Height + coverageCoverage and dimensional controls vary by district and should be confirmed in applicable code sections.
ParkingParking is treated as a compatibility factor in ADU legislation context and should be confirmed by district requirements.
Rental / occupancyADU definitions allow separate occupancy/use contexts, but project-level use conditions should be confirmed with planning.
Permit processConfirm district eligibility with planning, then validate dimensions/parking and submit permit package.

What this means for your lot

  • Use the address checker first to verify parcel-specific zoning.
  • Confirm setbacks and lot geometry before spending on plans.
  • Check short-term rental rules carefully — they vary significantly by city.

Key gotchas

  • Assuming your T3 zone allows ADUs — T3-R and T3-L (restricted and limited) frequently do not; only T3-O (open) permits accessory residential
  • STR license waitlists exist in Wynwood, Brickell-adjacent, and Little Havana areas — confirm availability before building for Airbnb income
  • Miami-Dade property tax assessments increase significantly after ADU improvements — plan for higher annual taxes
Florida SB-48 (2026 update): Under Florida's statewide ADU law, most single-family homeowners have the right to build an ADU by-right. Local municipalities cannot impose size limits below 1,000 sq ft or require owner-occupancy as a condition of building. If you believe a local denial violates SB-48, consult a Florida land-use attorney.

Building Limits

  • Max Size:1000 sq ft
  • Setbacks:5ft side / 10ft rear
  • Detached Allowed?Yes
  • Max Height:25 ft
  • Build Cost Est.:$130,000–$280,000

Rental Rules

No Owner-Occupancy Requirement: Both units can be rented to tenants simultaneously.

Short-Term Rentals: Not prohibited at the city level. State DBPR license required.

Estimated Monthly Income

$1,800–$3,200/month

Based on 2025–2026 Miami-Dade (Unincorporated) market data

Key ADU Restrictions in Miami-Dade (Unincorporated)

  • Miami 21 zoning code governs ADUs — only T3-O, T4, T5, and T6 transect zones permit accessory residential units; T3-R and T3-L (most single-family areas) typically do not
  • STR license required from City of Miami — cap-limited by neighborhood with waitlists in popular areas
  • Miami-Dade HVHZ construction standards apply — adds 20–30% to construction costs vs. non-coastal Florida

Common Mistakes to Avoid in Miami-Dade (Unincorporated)

  • Assuming your T3 zone allows ADUs — T3-R and T3-L (restricted and limited) frequently do not; only T3-O (open) permits accessory residential
  • STR license waitlists exist in Wynwood, Brickell-adjacent, and Little Havana areas — confirm availability before building for Airbnb income
  • Miami-Dade property tax assessments increase significantly after ADU improvements — plan for higher annual taxes

Eligible Zones in Miami-Dade (Unincorporated)

T3-OT4T5T6

Miami-Dade (Unincorporated) ADU — Frequently Asked Questions

Can I build an ADU in Miami-Dade (Unincorporated), Florida?

Miami-Dade guidance indicates ADUs are allowed in single-family zoned districts as attached, detached, or conversion units, with district-specific constraints.

What is the maximum ADU size in Miami-Dade (Unincorporated)?

Size limits vary by district and ordinance context; use city/county code sections for final constraints.

Do I need to be an owner-occupant to build an ADU in Miami-Dade (Unincorporated)?

Miami-Dade (Unincorporated) does not require owner-occupancy. Both the primary home and ADU can be rented to tenants simultaneously.

Can I use my Miami-Dade (Unincorporated) ADU as an Airbnb?

Miami-Dade (Unincorporated) does not prohibit short-term rentals at the city level. You must obtain a Florida DBPR Vacation Rental Dwelling license.

How do I get an ADU permit in Miami-Dade (Unincorporated)?

Confirm district eligibility with planning, then validate dimensions/parking and submit permit package.

Miami-Dade (Unincorporated) Planning Department

(305) 416-1100
Apply for Permit Online

Nearby Cities — ADU Rules

Miami BeachView ADU Rules →PinecrestView ADU Rules →AventuraView ADU Rules →

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More Miami-Dade County ADU Guides

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This page provides general information based on current ordinances and publicly available data as of March 2026. Zoning rules change — verify all requirements with your local planning department before making financial commitments.