Zoning & Size Limits
| Requirement | Chicago, IL | Minneapolis, MN |
|---|
| Allowed Zones | Citywide as-of-right in multi-unit residential (RT/RM) and c | All interior residential districts permitting single- or two |
| Max Size (Detached) | Detached coach houses governed by bulk/setback standards rather than a flat sq-ft cap (limited to 60% of the required rear setback area); Confirm buildable size with Chicago Dept. of Housing for your lot | 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) | Conversion (basement/attic) units governed by building/habitability standards (min 7'6" ceiling height); no flat sq-ft cap | 800 sq ft |
| Max Height | 22 ft (detached coach houses) | 20 ft, or the height of the principal structure if |
| Parking Required | No additional off-street parking required | No minimum off-street parking required |
| Owner Occupancy | Required on properties with 2 or fewer units (West/South/Sou | Not required (removed by a 2021 ordinance amendment; applies |
Setback Requirements
| Setback | Chicago, IL | Minneapolis, MN |
|---|
| Rear Setback | Detached ADU must sit within the rear 50% of the lot; Confirm with Chicago Dept. of Housing | 3 ft (5 ft from alleys for above-garage ADUs) |
| Side Setback | About 2 ft from the side property line (per the underlying zoning district) | 3 ft |
| Front Setback | N/A - a coach house must sit behind the principal | 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 7/10 while Minneapolis scores 9/10 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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