Published August 28, 2026
Minneapolis permits accessory dwelling units on most residential lots — one ADU per single-family or duplex property, in interior, attached, or detached form. It is one of the most permissive ADU environments in Minnesota, and it is why basement and garage-loft units are far more common inside the city than in the suburbs.
The three forms
Interior ADU — carved out of existing space, typically a basement or an attic. Cheapest path, no new footprint, no lot coverage issue.
Attached ADU — an addition with its own entrance, kitchen, and bath.
Detached ADU — a standalone structure or a unit above a detached garage. Highest cost, highest rent, best privacy.
Key rules to verify with the city
Minneapolis regulates ADUs through the zoning code, and the specifics — maximum size, height, setback, and lot coverage — depend on your district and lot size. Before designing, confirm with Minneapolis CPED:
- Maximum ADU floor area for your lot
- Height limits for a detached ADU or garage-loft unit
- Required rear and side setbacks for a detached structure
- Whether your lot's existing coverage leaves room
- Parking requirements — Minneapolis has eliminated minimums citywide, which materially helps ADU feasibility
- Rental licensing requirements if you intend to rent
Realistic costs
| Type | Cost |
|---|---|
| Interior basement ADU (existing walkout) | $90,000–$170,000 |
| Interior attic ADU | $110,000–$200,000 |
| Attached addition ADU | $180,000–$320,000 |
| Detached garage-loft ADU | $200,000–$350,000 |
| New detached ADU (600 sq ft) | $220,000–$380,000 |
The interior basement route is by far the best return, especially in a walkout or lookout house where egress and a separate entrance already exist.
What the build has to include
- Full kitchen with a range and mechanical ventilation
- Full bathroom
- Egress from every sleeping room: 5.7 sq ft clear opening, sill under 44 inches
- 7 foot minimum ceiling height in habitable rooms
- Fire separation between dwelling units — typically a rated ceiling assembly
- Interconnected smoke and CO alarms in both units
- Its own heat source or a properly zoned extension
- A separate entrance that does not pass through the primary dwelling
The financial case
A one-bedroom Minneapolis basement ADU built for roughly $130,000 typically rents in a range that services the construction cost within five to eight years while adding appraised value. It also gives you a housing option for a parent or an adult child without buying a second property — which for many families is the actual reason to build.
Order of operations
Zoning confirmation, then design to the ADU standard from day one. Retrofitting fire separation, a second heat source, and a compliant separate entrance into a basement you already finished costs far more than building it in.
Want an exact number for your project?
Free on-site estimate across the Twin Cities metro — no pressure, no obligation.
Frequently asked questions
Can I build an ADU in Minneapolis?
Yes. Minneapolis allows one accessory dwelling unit per single-family or duplex lot in interior, attached or detached form across most residential districts, subject to size, height and setback limits for your district.
How much does a Minneapolis ADU cost?
An interior basement ADU runs about $90,000 to $170,000, while a detached unit or garage loft runs $200,000 to $380,000.
Do I need a rental license for a Minneapolis ADU?
Yes, if you rent it to someone who is not part of your household. The city licenses rentals and inspects them.