Zoning & Size Limits
| Requirement | Chicago, IL | Minneapolis, MN |
|---|
| Allowed Zones | Single-family residential zones | All interior residential districts permitting single- or two |
| Max Size (Detached) | 700 sq ft (current pilot; new ordinance April 2026 removes size cap) | 1,300 sq ft or 16% of lot area (whichever greater); max 1,600 sq ft or size of primary dwelling (whichever less) |
| Max Size (Attached) | 800 sq ft | 800 sq ft |
| Max Height | 22 ft (coach houses) | 16 ft (20-21 ft if exterior materials match princi |
| Parking Required | 1 space per unit | No minimum off-street parking required |
| Owner Occupancy | Not required | Not required (removed by ordinance amendment, effective 2020 |
Setback Requirements
| Setback | Chicago, IL | Minneapolis, MN |
|---|
| Rear Setback | 15 feet | 3 ft (5 ft from alleys for above-garage ADUs) |
| Side Setback | 3 feet | 3 ft |
| Front Setback | 20 feet | Must meet primary dwelling front setback (ADUs pla |
Permits & Timeline
| Detail | Chicago, IL | Minneapolis, MN |
|---|
| Permit Timeline | 60-90 days | 40-60 days |
| Permit Fees | $2,800-$4,500 | $1,800-$3,000 |
| Impact Fees | $1,000-$1,800 | Minimal |
| Pre-Approved Plans | Limited availability | Available |
Construction Costs
| Cost | Chicago, IL | Minneapolis, MN |
|---|
| Avg Build Cost | $150,000-$300,000 | $140,000-$280,000 |
| Cost Per Sq Ft | $160-$315 | $130-$270 |
| Garage Conversion | $80,000-$180,000 | $70,000-$160,000 |
| Prefab ADU | $110,000-$250,000 | $100,000-$230,000 |
Rental Income Potential
| Rental | Chicago, IL | Minneapolis, MN |
|---|
| 1BR Avg Rent | $1,450-$1,950/mo | $1,350-$1,800/mo |
| 2BR Avg Rent | $1,850-$2,600/mo | $1,700-$2,400/mo |
| Short-Term Rentals | Not typically permitted | Permitted with registration |
| Est. ROI | 5-7% annual return | 7-10% annual return |
Which City Is Better for ADUs?
Chicago scores 6/10 while Minneapolis scores 8/10 on our ADU-friendliness index.
Minneapolis 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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