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Accessory Structures

Green Bay's Accessory Structures: The Rules That Matter

By CityRuleLookup Editorial Team

Every city handles accessory structures a little differently. In Green Bay, Wisconsin, there are 2 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

ADU Rules

Green Bay allows one accessory dwelling unit per lot behind the main house, capped at 1,000 square feet, but only with a conditional use permit and owner-occupancy of one unit.

Key details: Cap: One ADU per parcel. Size limit: 1,000 sq ft max. Occupancy: Owner must live on-site. STR use: ADUs cannot be short-term rentals. Approval: Conditional use permit required.

Building or renting out an unapproved ADU is a zoning violation; the City can require removal or bring the property into compliance through standard Code enforcement, since no separate ADU penalty is set.

This is one of the stricter rules in Green Bay's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Shed & Carport Rules

A detached shed on a Green Bay one- or two-family lot can be up to 1,000 square feet and 16 feet tall, and must sit at least 25 feet from the front lot line and 3 feet from other structures.

Key details: Max size, 1st shed: 1,000 sq ft per unit. Max height: 16 feet. Front setback: 25 feet. Between structures: 3 feet.

Placing a shed in the front yard, oversizing it past the Table 44-4 limits, or skipping the conditional use permit for a large metal shed is a zoning violation under Sec. 44-198, with forfeitures up to $500 per day.

The Bottom Line

Green Bay's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Green Bay is broadly strict or permissive.

Keep in mind that Green Bay can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.