Zoning & Size Limits
| Requirement | Miami, FL | Tampa, FL |
|---|
| Allowed Zones | City of Miami: ADUs allowed in T3-L under Miami 21; a propos | Designated ADU-eligible areas only (Seminole Heights, Tampa |
| Max Size (Detached) | City of Miami: confirm current cap with City of Miami Planning (proposed ~500 sq ft / 10% of lot, capped at 800 sq ft). Unincorporated Miami-Dade: 400-800 sq ft in RU-1 districts (varies by district) | 950 sq ft (larger setbacks apply when the ADU exceeds 15% of lot size) |
| Max Size (Attached) | See max_size_detached — confirm with City of Miami Planning | 950 sq ft - the 600 sq ft figure often cited is the Extended Family Residence cap, a separate family-only category |
| Max Height | Must not exceed height of principal structure | 22.5-35 ft (varies by overlay district; must not e |
| Parking Required | Maximum 1 additional space (no more than 2 vehicles); must b | 1 space per unit |
| Owner Occupancy | Effectively required for rental: an ADU may be rented only i | Required - the owner must reside on the property |
Setback Requirements
| Setback | Miami, FL | Tampa, FL |
|---|
| Rear Setback | 5 ft (RU-1 district) | 3 ft (20 ft when the ADU exceeds 15% of lot size) |
| Side Setback | 5 feet | 3 ft interior (7 ft when the ADU exceeds 15% of lot size) |
| Front Setback | 25 feet | 60 ft from the street; at least 10 ft (RS-75/100/1 |
Permits & Timeline
| Detail | Miami, FL | Tampa, FL |
|---|
| Permit Timeline | 120-180 days | 75-100 days |
| Permit Fees | $5,000-$8,000 | $3,500-$5,500 |
| Impact Fees | $2,000-$3,500 | $1,400-$2,200 |
| Pre-Approved Plans | Yes — Miami-Dade County ADU Blueprint program offe | Not available |
Construction Costs
| Cost | Miami, FL | Tampa, FL |
|---|
| Avg Build Cost | $180,000-$350,000 | $140,000-$280,000 |
| Cost Per Sq Ft | $240-$460 | $180-$350 |
| Garage Conversion | $80,000-$180,000 | $70,000-$160,000 |
| Prefab ADU | $120,000-$260,000 | $100,000-$230,000 |
Rental Income Potential
| Rental | Miami, FL | Tampa, FL |
|---|
| 1BR Avg Rent | $1,600-$2,200/mo | $1,300-$1,850/mo |
| 2BR Avg Rent | $2,000-$3,000/mo | $1,650-$2,400/mo |
| Short-Term Rentals | Not permitted | Restricted in most zones |
| Est. ROI | 5-7% annual return | 6-8% annual return |
Which City Is Better for ADUs?
Miami scores 5/10 while Tampa scores 3/10 on our ADU-friendliness index.
Miami edges ahead overall. Both cities offer viable ADU development opportunities — the best choice depends on your specific property, budget, and goals.
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