What's Required in Milwaukee
- Building permit required for residential accessory dwellings.
- Wisconsin Uniform Building Permit Seal fee of $80 applies.
- Residential occupancy permit is $65 per unit.
- Erosion control fee of $205 per lot required.
- Must include full kitchen and bathroom facilities.
- Electrical permit mandatory ($50 base price).
How Much Does an ADU Permit Cost in Milwaukee?
Budget $1,000–$2,500 for the Milwaukee permit itself (valuation-based), issued by the Department of Neighborhood Services — 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: includes building, electrical, and occupancy fees. 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 Milwaukee
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: residential occupancy permit is $65 per unit. Setbacks, height limits, and utility connections layer on top of those rules. The Department of Neighborhood Services 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 Milwaukee
Step 1: Zoning Audit
Ensure the lot allows for a secondary dwelling unit.
Step 2: Professional Plans
Submit drawings for the required DNS review process.
Step 3: Online Filing
Apply for 'Construction' and 'Trade' permits via the portal.
Step 4: Pay Fees
Submit occupancy, erosion control, and building seal fees.
Step 5: Occupancy Permit
Final $65 occupancy check required before habitation.