ADU rules in Wausau, WI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Wausau regulates dwellings, accessory uses, and accessory structures through Title 23 (Zoning) of the Wausau Municipal Code, adopted under Wis. Stat. Sec. 62.23. Residential zoning districts include SR-2, SR-3, SR-5, and SR-7 single-family residential districts (see Article II - Establishment of Zoning Districts) and various two-family/multifamily and mixed-use districts including UMU (Urban Mixed Use). Land use regulations (Article III, beginning at Sec. 23.03) and accessory use/structure standards establish where and how accessory living quarters are permitted. The Wausau Municipal Code does not explicitly use the term 'ADU' in its public table of contents; property owners considering an accessory dwelling, in-law unit, or second residential unit should confirm permitted/conditional status with the Inspections & Zoning Division at 407 Grant St., which administers building and zoning permits.
Wausau's zoning authority is Wis. Stat. Sec. 62.23, which empowers cities to regulate the use of buildings and land, height and bulk of structures, and the density of population by district. Title 23 of the Wausau Municipal Code is the city's Zoning Ordinance. Article II - Establishment of Zoning Districts (beginning at Sec. 23.02) creates the residential districts (single-family residential districts coded SR-2, SR-3, SR-5, SR-7, plus two-family and multifamily districts) and special districts including the Urban Mixed Use (UMU) district. Article III - Land Use Regulations (beginning at Sec. 23.03) sets out permitted, conditional, and accessory uses for each district. Article V (Sec. 23.05) addresses nonconforming uses, lots, and structures, including the interaction between nonconforming structure rules and overlay regulations such as the floodplain overlay (Sec. 23.05.30(2)(c)). The Wausau code does not currently include a stand-alone state-uniform 'ADU' chapter as some Wisconsin cities (e.g., Appleton's Sec. 23-55 / 23-56) have adopted; instead, second dwelling units are evaluated under the district use tables and accessory-structure provisions, plus state-mandated minimum lot area, setback, height, and parking standards. Building permits are required under Title 15 (Building Code), administered by the Inspections & Zoning Division. Because regulations differ by district and may have been amended by the Common Council, applicants should consult the current Title 23 text on Municode Library and meet with city zoning staff before designing an accessory dwelling or in-law unit.
Building or occupying an accessory dwelling unit, second living unit, or in-law suite without the required zoning approval and building permits violates Title 23 and Title 15 of the Wausau Municipal Code. Enforcement may include stop-work orders, citations, daily forfeitures under the city's general penalty provisions, and orders to remove or modify non-conforming structures. Operating a second unit as a separate rental in a single-family district where it is not a permitted, conditional, or lawfully nonconforming use is independently actionable.
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