Marathon County, WI Solar Energy: Panel Permits (2026)
Key Facts
- Permit
- Zoning permit required, all districts
- Ground-mount height
- Max 35 feet at full tilt
- Commercial-scale
- Needs conditional use permit
- Coverage
- Town-adoption required
Summary
Solar energy systems are allowed by right in every Marathon County zoning district but need a zoning permit and a to-scale site plan approved by the Zoning Administrator before installation.
F.Plan Approval Required. All solar energy systems shall require approval by the Zoning Administrator.1.Plan Applications. Plan applications for solar energy systems shall be accompanied by to-scale horizontal and vertical (elevation) drawings. The drawings must show the location of the system on the building or on the property for a ground-mount system, including the property lines.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 59).
Full Breakdown
Under Sec. 17.408.02.F, all solar energy systems require Zoning Administrator plan approval, with applications carrying to-scale horizontal and vertical drawings showing the system's location on the building or property, including property lines. Sec. 17.408.01.B bars erecting, enlarging, or extending an SES without a zoning permit, and roof systems face height and perimeter limits while ground-mounted systems cap at 35 feet and must meet accessory-structure setbacks. Commercial-scale systems instead need a conditional use permit under Sec. 17.408.03. Applies only in towns that adopted the county zoning ordinance.
Violations & Fines
Installing or expanding a solar energy system without the required zoning permit and approved plan violates Sec. 17.408.01.B; the Zoning Administrator can withhold approval until drawings and setbacks conform.
Frequently Asked Questions
Do I need a permit for rooftop solar panels?
Is a homeowner's ground-mounted solar array capped in height?
Sources & Official References
Other rules in Marathon County
Compare Marathon County to another location·View the Wisconsin solar energy overview
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