ADU Permits: Greenfield vs Milwaukee
How do adu permits rules compare between Greenfield, WI and Milwaukee, WI?
Greenfield, WI
Milwaukee County
No data available yet for Greenfield.
Milwaukee, WI
Milwaukee County
Milwaukee permits ADUs (often called 'secondary units' or 'in-law apartments') under Code of Ordinances Chapter 295 (Zoning). The 2019 zoning revisions allow ADUs by right in RS-2, RS-3, RS-5, and RS-6 single-family districts. Permits issue through the Department of Neighborhood Services (DNS) via the LMS Online portal. Wisconsin SPS 320-325 commercial/residential building codes apply.
View full Milwaukee rules →Key Facts Comparison
| Fact | Greenfield | Milwaukee |
|---|---|---|
| Code Authority | - | Chapter 295, Subchapter 5 |
| By-Right Zones | - | RS-2, RS-3, RS-5, RS-6 |
| Max Size | - | 800 sq ft |
| Max Height | - | 25 feet |
| Filing Portal | - | DNS LMS Online |
| State Code | - | Wisconsin SPS 320-325 |
Highlighted rows indicate differences between cities.
Greenfield FAQ
No FAQs available.
Milwaukee FAQ
Do I need a permit for a Milwaukee ADU?
Yes. All ADUs require zoning verification, building permit, and trade permits through Milwaukee DNS via LMS Online. Wisconsin Uniform Dwelling Code applies. Snow load and frost-depth foundation requirements are critical for cold-climate compliance.
How big can my Milwaukee ADU be?
Chapter 295, Section 295-503 limits ADUs to 800 square feet and 25 feet in height. Setbacks follow the underlying RS district standards. Detached, attached, and interior conversion ADUs are all allowed in RS-2 through RS-6 districts.
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