Wisconsin Act 173: Rezoning Deadlines and Comprehensive Plan Rules

Wisconsin Act 173, the “Truth in Planning” law signed by Governor Tony Evers on April 2, 2026, requires cities and villages to map out where housing will be built over the next 20 years, set density ranges for those areas in their comprehensive plans, and approve qualifying residential rezoning requests within 90 days. The law takes effect January 1, 2028, giving municipalities roughly two years to update their plans and zoning ordinances to match.¹

The law was a response to Wisconsin’s housing shortage and to what supporters described as a rezoning process that let municipalities adopt housing-friendly plans and then block individual projects consistent with them. Rep. Rob Brooks, the Saukville Republican who sponsored the bill, called it a response to “not-in-my-backyard nimbyism going on around the state.”² A 2024 Wisconsin Policy Forum report found the state issued 3.47 housing permits per 1,000 residents in 2023, below the national rate of 4.48.³

What the Law Requires in a Comprehensive Plan

Act 173 turns the comprehensive plan from a general policy document into a binding guide for zoning decisions. A city or village must identify where residential development will occur over a 20-year horizon, broken into five-year increments, and specify minimum and maximum net residential density ranges for each identified growth area.¹

Local zoning and subdivision ordinances then have to be consistent with those density ranges. Under the law, an ordinance is considered consistent if it permits the land uses expressly identified for that area in the plan’s land use map.⁴

If a development application or rezoning request comes in and the plan doesn’t yet include the required density standards, the municipality has 180 days to amend the plan to add them. For that type of targeted amendment, the usual comprehensive planning procedures don’t apply.⁵

The 90-Day Rezoning Approval Rule

The operational core of Act 173 is a mandate that cities and villages approve qualifying residential rezoning requests within 90 days. All of the following conditions must be met for the clock to apply:

The area is identified for residential use in the municipality’s comprehensive plan, and the proposed density falls within the plan’s specified range.
The land is adjacent to or in close proximity to existing development, allowing reasonable service by existing infrastructure.
The municipality’s current housing supply does not meet existing or forecasted demand within the next five years.
The applicant certifies that the land is not in a farmland preservation zoning district, an agricultural enterprise area, or subject to a farmland preservation agreement.
The request identifies the proposed minimum and maximum net density of the development.¹

If the plan lacks the required density standards and the 180-day amendment clock has been triggered, the 90-day approval period doesn’t begin until the 180-day period expires. An applicant can also agree to extend the 90 days.⁵

When a Municipality Can Still Deny a Request

The grounds for denial are narrow. A municipality may deny a qualifying request only if it demonstrates that denial is necessary to prevent a shortage in or overburdening of public facilities, or to address a significant threat to public health or safety.⁵

There is also one delay option. A municipality may hold a request for up to one year if it has issued a request for proposals for a qualifying residential development consistent with its comprehensive plan and received no responses.⁵

What Happens If the City Misses the Deadline

If a municipality fails to act within 90 days, the applicant can go to court and seek a writ of mandamus to force action. The law presumes substantial damages or injury for purposes of that claim, and a successful applicant may recover court costs and reasonable attorney fees.¹

The consequences are harsher for a municipality that doesn’t bring its comprehensive plan into compliance at all. If the plan fails to meet Act 173’s requirements, a request to rezone land for residential development results in an automatic rezoning to the requested classification, or to the least restrictive zoning classification available.²

Who and What the Law Doesn’t Cover

Act 173 applies only to cities and villages. Towns, counties, and land within the extraterritorial zoning jurisdiction of a city or village are excluded from the planning mandates and the 90-day approval requirement.⁵ Land enrolled in farmland preservation programs is also outside the law’s reach. And nothing in Act 173 forces a municipality to allow housing in any particular place; it requires that planning for residential growth be done transparently and that the municipality follow through on the plan it adopts.²

Tax Incremental District Changes

Act 173 also modifies Wisconsin’s Tax Incremental Finance law. It defines “newly platted residential development” as residential development on a parcel that has not previously been the site of permanent structures, excluding structures used solely for agricultural purposes. The law also extends the allowable housing-related extension of a Tax Incremental District from one year to two years, giving municipalities more time to use TIF revenue for affordable housing.⁴

What Municipalities Need to Do Before January 1, 2028

The compliance work is substantial. Cities and villages must project housing demand, map future residential growth areas, set minimum and maximum density ranges, evaluate infrastructure capacity, and amend their zoning ordinances to line up with the updated plans. The Wisconsin Department of Administration has noted that the law gives zoning decisions “greater legal and practical significance” and that planning commissions, elected officials, and staff will need training on the new requirements.⁶

Smaller municipalities face a harder road. Many don’t have up-to-date comprehensive plans, and the state’s Comprehensive Planning Grant Program, which once helped local governments develop them, stopped awarding grants in 2010 with no plans to revive it.⁶ Observers at 1000 Friends of Wisconsin have said the law creates particular uncertainty for those communities, which may struggle to meet the new requirements without outside technical or financial help.⁷

No legal challenges to Act 173 had been filed as of mid-2026. The combination of the mandamus remedy, attorney-fee shifting, and the automatic-rezoning consequence for noncompliant plans gives developers and other parties, as legal commentators have put it, “another arrow for their quiver” in contesting municipal zoning decisions that don’t match adopted comprehensive plans.

1
Wisconsin State Legislature. 2025 Wisconsin Act 173
2
Badger Institute. Bill to Increase Wisconsin Housing Supply Is Now Law
3
Wisconsin Policy Forum. Housing Permitting Slows, Adding to Affordability Concerns
4
Wisconsin Department of Revenue. 2025 Wisconsin Act 173 Summary
5
Wisconsin State Legislature. Legislative Council Act Memo — 2025 Wisconsin Act 173
6
Wisconsin Department of Administration. Comprehensive Planning
7
1000 Friends of Wisconsin. Housing-Related Legislation to Watch