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.
Milwaukee Code Chapter 295 (Zoning) Subchapter 5 governs accessory dwelling units. Following 2019 amendments, ADUs are permitted by-right in RS-2, RS-3, RS-5, and RS-6 single-family residential districts. Dimensional standards under Section 295-503: maximum 800 sq ft floor area; maximum 25 feet height; setbacks per underlying district (typically 3 feet side, 25 feet rear in RS districts). Detached, attached, and interior conversion ADUs are all permitted. Building permits required through Milwaukee Department of Neighborhood Services (DNS) using the LMS Online (Land Management System) portal. Required permits: zoning verification, building permit, electrical permit, plumbing permit (Wisconsin Department of Safety and Professional Services - DSPS oversight), HVAC permit. Wisconsin Uniform Dwelling Code (SPS 320-325) sets minimum residential standards. Plan review typically 15-30 business days. Historic Preservation Commission review applies in Brewers Hill, Walker's Point, and other designated districts. Cold-weather construction requires frost-protected foundations.
Unpermitted ADU construction violates Chapter 295 Section 295-905 (Enforcement) with civil forfeitures of $200-$2,500 per offense. DNS may issue raze orders for unsafe structures and stop-work orders. Wisconsin DSPS may impose separate penalties for plumbing/electrical work without proper licensing. Liens may be filed for unpaid fines and corrective work.
Milwaukee, WI
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