Miami's ADU regulations are relatively restrictive due to density concerns and hurricane/flood resilience requirements. However, the city recently began exploring ADU policies to address housing affordability. ADUs are allowed in select zones with significant restrictions.
Zoning & Size Requirements [1][2]
| Allowed Zones | Limited to select residential zones |
| Max Size (Detached) | 400-800 sq ft (varies by district) |
| Max Size (Attached) | 400-800 sq ft (varies by district) |
| Max Size (JADU) | Not allowed |
| Max Height | Must not exceed height of principal structure |
| Max Units | 1 ADU per lot |
Setback Requirements [1][2]
| Rear Setback | 5 ft (RU-1 district) |
| Side Setback | 5 feet |
| Front Setback | 25 feet |
| Parking Required | 2 spaces per unit |
| Owner Occupancy | Not required |
| Min Lot Size | 8,000 sq ft |
Permit Process & Fees [3]
| Approval Process | Zoning variance + building permit |
| Review Timeline | 120-180 days |
| Permit Fees | $5,000-$8,000 |
| Impact Fees | $2,000-$3,500 |
| Plan Check | 6-8 weeks |
| Pre-Approved Plans | Not available |
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Construction Costs [4][5]
| Average Build Cost | $180,000-$350,000 |
| Cost per Sq Ft | $240-$460 |
| Garage Conversion | $80,000-$180,000 |
| Prefab ADU (Installed) | $120,000-$260,000 |
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Rental Income Potential [6][7]
| Avg Rent (1 Bedroom) | $1,600-$2,200/mo |
| Avg Rent (2 Bedroom) | $2,000-$3,000/mo |
| Short-Term Rental | Not permitted |
| Est. Annual ROI | 5-7% annual return |
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Recent Law Changes
What's Changed Recently
- Live Local Act ADU provisions expanded (2026): More counties adopting programs
- Miami-Dade ADU ordinance update: Increased max size to 1,000 sq ft (2026)
- St. Petersburg launched ADU incentive program with permit fee waivers
- Florida considering statewide ADU reform bill for 2026 legislative session
Tips for Building an ADU in Miami
- Miami requires extensive flood mitigation; elevated construction adds significant cost
- Hurricane-resistant design standards are mandatory; budget for reinforcement
- Salt-air corrosion requires premium materials; factor into long-term costs
- Zoning variance process is lengthy; engage planning consultants early
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Miami 21 Zoning Code | City of Miami Municipal Code — Accessed 2026-02-24
- Accessory Dwelling Unit (ADU) — Miami-Dade County Planning Department — Accessed 2026-02-25
- City of Miami Code of Ordinances (Municode) Municipal Code — Accessed 2026-02-24
- HomeAdvisor — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- Planning & Zoning | City of Miami Planning Department — Accessed 2026-02-24
- Florida Live Local Act — ADU Provisions Government Data — Accessed 2026-02-24
Frequently Asked Questions
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