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
| Allowed Zones | Limited to select residential zones |
| Max Size (Detached) | 750 sq ft |
| Max Size (Attached) | Not typically allowed |
| Max Size (JADU) | Not allowed |
| Max Height | 25 feet |
| Max Units | 1 ADU per lot |
Setback Requirements
| Rear Setback | 25 feet |
| 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
| 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
| 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 (installed) |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| 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 |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Miami-Dade County exploring new ADU policies
- 2023: Limited ADU pilot program launched in select neighborhoods
- 2024: Flood resilience requirements updated for any new ADUs
- 2023: Hurricane-resistant construction standards now required
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
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