Do I Need a Permit to Install Solar Panels in Wisconsin?

Installing solar panels in Wisconsin requires at least an electrical permit, which covers the wiring, inverter installation, and connection to your home's electrical panel. Many municipalities also require a building permit because the panels add structural load to the roof — this is especially common for larger arrays. You will also need an interconnection agreement with your utility company before your system can connect to the grid. The permit process for solar installations typically takes 1 to 4 weeks. Some municipalities have streamlined solar permitting with expedited review and reduced fees. Milwaukee has a dedicated solar permit process. Madison offers over-the-counter solar permits for standard residential installations. Permit fees vary but typically total $100 to $500 for combined electrical and building permits. Wisconsin law (Wis. Stat. § 66.0401) protects homeowners' rights to install solar energy systems and prohibits unreasonable local restrictions. HOAs can impose aesthetic requirements but cannot effectively prohibit solar installations. After installation, your system must pass an electrical inspection and receive utility approval before connecting to the grid. The federal Investment Tax Credit (ITC) covers 30% of installation costs, and Focus on Energy offers additional Wisconsin-specific rebates.

Check Your Municipality

Permit requirements, fees, and exemptions vary by municipality. Verify the specifics for your location.