Waukesha County, WI Solar Energy: Panel Permits (2026)

Waukesha County treats a ground-mounted solar array like any other accessory structure for setback purposes, but it carves out a specific path when the panels cannot physically fit within the county's normal accessory-structure location rules. E of the Shoreland Protection Ordinance authorizes the Board of Adjustment 'to grant special exceptions and variances for renewable energy resource systems if said system cannot meet normal location requirements of this Ordinance for accessory structures,' and defines 'renewable energy resource systems' to include solar energy systems, wind energy systems, waste conversion energy systems, and any other energy system relying on a renewable resource.

If the board turns down an application, it must issue a written statement of its reasons, a protection not automatically given to every variance applicant. The Board of Adjustment itself is established under Wis. 694 with five members and two alternates appointed by the County Executive and confirmed by the County Board, all of whom must live in the county outside any incorporated city or village, with no two members from the same town. Meetings are open to the public and minutes recording each member's vote are kept as a public record.

Beyond the renewable-energy carve-out, the board's general variance standard still applies: the applicant carries the burden of proving unnecessary hardship tied to conditions unique to the property, not to the owner personally, and not self-created. Roof-mounted solar collectors get separate, lighter treatment in several zoning districts as a permitted accessory use, provided a registered engineer certifies the roof structure can support the load. Under Section 38(a)5, the Wisconsin DNR must be notified of any board decision within 10 days.