ADU Permits: Milwaukee vs West Allis
How do adu permits rules compare between Milwaukee, WI and West Allis, WI?
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 →West Allis, WI
Milwaukee County
No data available yet for West Allis.
Key Facts Comparison
| Fact | Milwaukee | West Allis |
|---|---|---|
| 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.
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.
West Allis FAQ
No FAQs available.
Compare other topics
See how Milwaukee and West Allis compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool