Racine County, WI Accessory Structures: ADU Rules (2026)
ADU rules in Racine County, WI, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Max suite size
- 800 sq ft
- Allowed districts
- 11 listed residential/ag zones
- Occupants
- Up to 2 family members
- Structure type
- Attached only, no detached
- Paperwork
- Recorded deed restriction required
Summary
Racine County allows one in-law suite as an accessory use in single-family homes across eleven zoning districts, capped at 800 square feet and connected to the main house: never a stand-alone building.
In-law suites (herein "suite") may be allowed as an accessory use to a single-family residence located in the R-1, R-2, R-2S, R-3, R-3A, R-4, R-5, R-5A, A-1, A-2 and C-2 zoning districts, subject to the following:
(1) Up to two (2) family members related by blood or marriage to the family occupying the principal structure may reside in the suite and must be allowed unrestricted access to the common areas of the dwelling.
(2) The suite shall not have separate gas, water, and/or electric meters (more than one (1) meter per utility would constitute a multi-family dwelling unit, which is prohibited).
(3) The suite shall not be located in any detached accessory structure.
(4) The gross floor area of the suite shall not exceed eight hundred (800) square feet (not including areas for common utilities such as water heater, furnace, etc.).
(5) The suite shall be connected to the main heated living area of the dwelling by way of common walls (the suite shall not be connected to the dwelling by a breezeway, garage, or corridor as this would constitute a multi-family dwelling unit and that is prohibited). A code-compliant suite may be located above a garage that is attached in its entirety to a single-family residence.
(6) There shall be only one (1) address and one (1) mailbox for the lot containing the residence and suite.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 33).
Full Breakdown
Racine County's zoning code permits in-law suites as an accessory use to a single-family home in the R-1, R-2, R-2S, R-3, R-3A, R-4, R-5, R-5A, A-1, A-2 and C-2 districts. Up to two family members related by blood or marriage may occupy the suite, which is capped at 800 square feet, must share utility meters with the main house, and must connect to it through common walls, not a breezeway, garage, or detached structure. Homeowners must record a deed restriction with the zoning permit application confirming the suite won't become a separate rental unit, and unsewered properties need private wastewater system approval first.
Frequently Asked Questions
Can I build a detached in-law suite in Racine County?
How many people can live in the suite?
Sources & Official References
Other rules in Racine County
How Racine County compares: Easiest Cities to Build an ADU·Compare Racine County to another location·View the Wisconsin accessory structures overview
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