Accessory Structure Permit
Required for detached structures such as sheds, workshops, barns, and outbuildings on residential or commercial property. Wisconsin municipalities set size thresholds — structures under 200 sq ft are often exempt, but thresholds vary. Larger accessory structures must comply with setback, height, and lot coverage requirements.
When Is a Accessory Structure Permit Required?
- Detached garages and carports
- Sheds and storage buildings over 200 sq ft (varies by municipality)
- Workshops and hobby buildings with electrical or plumbing
- Agricultural accessory buildings in residential zones
When Is a Accessory Structure Permit NOT Required?
- Sheds under 200 sq ft without electrical or plumbing in most municipalities
- Portable storage units and temporary structures
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Accessory Structure Permit Fees by Municipality
Fee and processing time data for accessory structure permit permits across Wisconsin municipalities. Click any jurisdiction for complete details including application links and requirements.
| Jurisdiction | Fee | Processing Time | Status |
|---|---|---|---|
| City of Milwaukee | $85 | 2-3 weeks | Current |
| City of Madison | $75 | 1-2 weeks | Current |
| City of Green Bay | $65 | 1-2 weeks | Current |
Data note: Fees are sourced from official municipal fee schedules and verified periodically. Actual fees may vary based on project valuation and scope. Click any jurisdiction for the most current data and direct application links.
Frequently Asked Questions — Accessory Structure Permit
Do I need a permit for a shed in Wisconsin?
It depends on the size and your municipality. Most Wisconsin cities exempt sheds under 200 sq ft that have no electrical or plumbing. Larger sheds and any structure with utilities require a permit. Always check local zoning for setback and lot coverage limits before building.
How close to the property line can I build an accessory structure?
Setback requirements vary by municipality and zoning district. Most Wisconsin cities require at least 3–5 feet from the side and rear property lines for accessory structures. Corner lots may have additional setback requirements. Check your local zoning code for exact measurements.
Managing permits across multiple jurisdictions?
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