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Outagamie County, WI Accessory Structures: ADU Rules (2026)

Significant Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

ADU rules in Outagamie County, WI, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Size cap: 600 sq ft or 25% of home
Owner occupancy: mandatory, main house or unit
Occupants: max 2, elderly/disabled/related only
Dimensional standards: RSF district limits apply
Coverage: town-adopted zoning areas only

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Wisconsin under recent ADU streamlining laws. The Outagamie County, WI rules below cover local size, height, and setback requirements.

Summary

Outagamie County caps in-home accessory apartments at 600 square feet, requires the owner to live on-site, and limits occupants to two people who are elderly, disabled, or related to the owner.

City-specific rules exist: Appleton has its own adu rules rules that differ from Outagamie County's county-level regulations. If you live in Appleton, check the city-specific page instead.

(b) Mandatory owner occupancy. The owner of the single-family residence must occupy either the principal residence or the accessory residence. ... The accessory apartment shall not exceed 600 square feet of floor area or 25 percent of the entire floor area of the dwelling, whichever is greater. (d) Maximum lot coverage and maximum height requirements, as well as minimum yard requirements in the RSF single-family residential district, shall be met.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 26).

Full Breakdown

Section 54-466 lets single-family homes in unincorporated, zoned Outagamie County add one accessory dwelling, but only for up to two occupants who are handicapped, over 60, or related to the owner-occupant. The owner must live in either the main house or the accessory unit. The unit must stay substantially contained within the existing structure, capped at 600 square feet or 25% of the home's total floor area (whichever is larger), with exterior modifications matched to the principal building's look, and it must still meet the RSF district's lot coverage, height and yard standards.

Violations & Fines

An accessory dwelling built oversized, without owner-occupancy, or rented to unqualified occupants is a zoning violation the county can order corrected or removed.

Frequently Asked Questions

Can I rent my accessory apartment to anyone in unincorporated Outagamie County?

No. Section 54-466 limits occupancy to no more than two people who are over 60, handicapped, or related to the owner, and the owner must live in either the main house or the unit.

How big can the accessory unit be?

Up to 600 square feet or 25% of the home's total floor area, whichever is larger, and it must stay substantially contained within the single-family structure per §54-466(c).

Sources & Official References

[1]Outagamie County Code of Ordinances § 54-466 (Municode)

Other rules in Outagamie County

Shed & Carport RulesSome Restrictions Parking Rules: RV & Boat ParkingSome Restrictions Noise Ordinances: Vehicle NoiseSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Noise Ordinances: Barking DogsSome Restrictions Noise Ordinances: Amplified Music & Outdoor SoundSome Restrictions Parking Rules: Loading ZonesSome Restrictions

All Outagamie County rules

How Outagamie County compares: Easiest Cities to Build an ADU·Compare Outagamie County to another location·View the Wisconsin accessory structures overview

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ADU Rules in Cities Across Outagamie County

Appleton, WI Little Chute, WI