ADU (Accessory Dwelling Unit) Permit in Detroit (2026)
ADU (Accessory Dwelling Unit) permit requirements, fees, and process for Detroit, MI. Find out if you need a permit and how to apply.
Yes, a ADU (Accessory Dwelling Unit) permit is required in Detroit, MI.
A ADU (Accessory Dwelling Unit) permit is required in Detroit, MI. The Detroit Buildings, Safety Engineering and Environmental Department (BSEED) handles permit applications for Detroit. Below you will find the current thresholds, fees, and process for obtaining a adu (accessory dwelling unit) permit in Detroit.
When Is a Permit Required?
When a ADU (Accessory Dwelling Unit) Permit Is Required in Detroit: All ADU construction
Permit Fees
ADU (Accessory Dwelling Unit) Permit Fees in Detroit: $1,000-$4,500. Estimated timeline: 6-10 weeks.
Estimated timeline: 6-10 weeks
How to Get a ADU (Accessory Dwelling Unit) Permit in Detroit
Verify whether your project meets the permit threshold in Detroit: All ADU construction.
Prepare your permit application and plans. Contact the Detroit Buildings, Safety Engineering and Environmental Department (BSEED) at https://detroitmi.gov/departments/buildings-safety-engineering-and-environmental-department for required documentation.
Submit your application online at https://detroitmi.gov/departments/buildings-safety-engineering-and-environmental-department/permits or in person at the Detroit Buildings, Safety Engineering and Environmental Department (BSEED).
Pay the permit fee: $1,000-$4,500.
Wait for plan check approval. Estimated timeline: 6-10 weeks.
Schedule required inspections through https://detroitmi.gov/departments/buildings-safety-engineering-and-environmental-department/inspections. All inspections must pass before project is finalized.
Important: Detroit BSEED permit required. Detroit's vacant land strategy includes ADU construction on consolidated parcels. Detroit Land Bank Authority (DLBA) may have specific requirements for properties sold through their programs.
Detroit Buildings, Safety Engineering and Environmental Department (BSEED)
Phone: (313) 224-3158
Website: https://detroitmi.gov/departments/buildings-safety-engineering-and-environmental-department
Online Permits: https://detroitmi.gov/departments/buildings-safety-engineering-and-environmental-department/permits
Hours: Mon-Fri 8:00am-4:30pm
Frequently Asked Questions
Can I build an ADU on a vacant lot I bought from the Detroit Land Bank?
Yes, but it requires careful steps. Detroit Land Bank Authority (DLBA) properties purchased for side lot or development use may be subject to deed restrictions requiring improvement within a set timeline. To build a standalone ADU on an adjacent vacant lot, you would typically first consolidate the lots through the City of Detroit, then apply for a BSEED building permit for the ADU. Contact the Detroit Planning and Development Department to confirm consolidation requirements before purchasing.
What makes Detroit's ADU situation unique compared to growing cities?
Detroit is the nation's largest shrinking city, with roughly 25% of its land area now vacant. This means ADU opportunities in Detroit are different from cities like Austin or Denver. Rather than adding to congested neighborhoods, Detroit ADUs often serve as infill on empty lots, help rehabilitate underused carriage houses and garages, and contribute to the city's comeback strategy. The Detroit Land Bank Authority sells vacant lots at low prices specifically to encourage this kind of development.
Are short-term rentals (Airbnb) allowed in Detroit?
Yes. Detroit allows short-term rentals and requires an STR license ($100/year). Michigan Act 20 of 2023 prevents Detroit from banning STRs outright in residential zones, though Detroit may impose operational requirements. STR operators must have a Certificate of Occupancy and comply with Detroit's rental housing standards. Detroit's urban revival has made Corktown, Midtown, and the Riverfront attractive for Airbnb visitors.
I own a home in the Boston-Edison Historic District. Can I make exterior changes?
Yes, but you need a Certificate of Appropriateness from the Detroit Historic District Commission (HDC) before beginning any exterior alterations, including additions, siding changes, window replacements, or ADU construction visible from the street. The HDC reviews proposals for compatibility with the district's historic character. Applications are reviewed at monthly HDC meetings. Contact the Detroit Planning and Development Department at (313) 224-6380.
What permits does Detroit require for a home addition?
A building permit from the Detroit BSEED is required for all structural additions. You'll need architectural drawings, property ownership verification, and compliance with zoning setbacks. Permit fees are based on construction value. Detroit's permit office is at the Coleman A. Young Municipal Center. Applications can be initiated online through the BSEED portal. Expect 4-8 weeks for plan review.
Source: Detroit Building Code — ADU (Accessory Dwelling Unit) Requirements. Last verified April 6, 2026. View source