Permit Required? Required
Typical Fee Range $1,000–$3,000 New construction permit rate ($83.50 base + $16.55 per $1,000) applies.
Fee Method Valuation-based
Apply Online Apply at Buildings, Safety Engineering, and Environmental Department →

What's Required in Detroit

  • Full architectural plans and site plan showing ADU location.
  • Must be located in the rear yard and meet lot occupancy rules.
  • Requires independent cooking, sleeping, and sanitation facilities.
  • Must meet Michigan Residential Code for safety and egress.
  • Utility separation or shared capacity must be professionally verified.
  • Special Land Use hearing may be required if property isn't zoned by-right.

How Much Does an ADU Permit Cost in Detroit?

Budget $1,000–$3,000 for the Detroit permit itself (valuation-based), issued by the Buildings, Safety Engineering, and Environmental Department — but treat that as the entry fee, not the total. ADUs are full dwelling units, so the permit stack usually includes building, electrical, plumbing, and mechanical trade permits, plus plan review. One local note: new construction permit rate ($83.50 base + $16.55 per $1,000) applies. Get an itemized fee estimate from the department before finalizing your budget; the spread between a simple conversion and a new detached build is wide.

ADU Size Limits and Zoning Rules in Detroit

Before drawing plans, check the two gates that sink most ADU projects: size and zoning. Size ceilings vary by lot and ADU type (attached, detached, or conversion), so confirm your specific configuration. Other recorded conditions: must be located in the rear yard and meet lot occupancy rules. Setbacks, height limits, and utility connections layer on top of those rules. The Buildings, Safety Engineering, and Environmental Department can confirm what your specific lot allows — worth doing before you pay for architectural drawings rather than after.

How to Get a ADU Permit in Detroit

1

Step 1: Pre-App Meeting

Consult with BSEED Zoning to confirm the ADU is allowed by right.

2

Step 2: Custom Plans

Hire an architect to create structural and trade drawings.

3

Step 3: Online Filing

Submit the 'New Structure' application via eLAPS.

4

Step 4: Pay Fees

Pay the valuation-based building and plan review fees.

5

Step 5: Multi-Stage Inspections

Full series from footings and framing to final occupancy.

Frequently Asked Questions

Yes, garage conversions to living space cost roughly $800-$1,500 in permit fees.
It follows new construction rates: $83.50 for the first $2k + $16.55 per add'l $1k.
Usually yes for rental ADUs, though shared meters may be allowed for family use.