How to Get a Conditional Use Permit for Commercial Solar in Lake County

Commercial solar development in unincorporated Lake County runs through a conditional use permit, and the process works differently from every other conditional use the county reviews. State law sets the standards, caps how restrictive the county can be, and requires approval when an application complies. For developers, that changes the strategic question from persuading a board to documenting compliance.

The distinction is worth understanding before an application is prepared, because the arguments that win a discretionary land use case are largely irrelevant here.

What Counts as a Commercial Solar Energy System?

The category is defined by purpose rather than size. A commercial solar energy system is a ground-mounted installation whose primary purpose is generating electricity for wholesale or retail sale, rather than for consumption on the host property.

Two threshold points determine whether this process applies:

• Jurisdiction. The conditional use permit process governs unincorporated Lake County. Property inside a municipality follows that municipality’s zoning.
• Purpose. A system built primarily to offset a business’s own electricity use is treated as accessory, not commercial, and follows different rules.

Why Lake County’s Solar Permit Process Is Different

Lake County is subject to the Illinois Solar Statute for Counties, 55 ILCS 5/5-12020, which establishes the maximum standards a county may impose on commercial solar facilities. The county implements those limits through Lake County Code Section 151.112(WW), Section 151.260, and Appendix T.

The consequence is a conditional use permit that operates on a different logic from the county’s standard process:

• A standard conditional use turns on the Zoning Board of Appeals exercising discretionary judgment, including whether a proposed use would have a substantial adverse impact on natural resources.
• A commercial solar conditional use turns on precise, largely quantitative standards. Whether panels meet the maximum height, for example, involves no discretion.

Because the standards are objective, the county is required to approve a compliant application following the mandatory public hearing. The statute also prohibits counties from banning commercial solar or imposing moratoriums on it, which is a meaningful contrast with land uses the county remains free to pause.

What Are the Steps to Get a Conditional Use Permit?

Lake County’s review process for commercial solar energy systems runs in five stages:

1. Early Assistance meeting. Applicants are required to meet with Planning, Building and Development staff before preparing an application, to identify issues and clarify which code requirements apply.
2. Site Capacity and Site Plan Review. This determines whether the property can support the project from a land-use intensity standpoint and establishes site layout. Review covers impervious surface and floor area thresholds, setbacks, landscape buffering, stormwater facilities, and protected natural resources on site. Approval is a prerequisite to later permits.
3. Application submittal. All required documents, information, and fees must be complete before a delegated conditional use permit application is accepted. Staff then schedule a public hearing.
4. Zoning Board of Appeals hearing. The hearing must be held no more than 60 days after a complete application is filed, and is typically scheduled in the local township. The board takes public comment and testimony, receives the applicant’s evidence, and issues a final decision.
5. Final permitting. Construction cannot begin until required building and site development permits are issued.

Decision authority for these permits has been delegated to the Zoning Board of Appeals by the County Board. An affirmative vote of four members is required for approval, and the board’s decision on a delegated permit is final.

What Standards Must a Commercial Solar Project Meet?

The substantive requirements reflect the ceiling set by state law:

• Height. Total panel height may not exceed 20 feet, measured from grade to the highest point of the arrays at full tilt.
• Fencing. The system must be enclosed by an approved fence restricting public access, encompassing the entire facility and including a locking mechanism. Maximum height is six feet, or six feet six inches where elevation is required for drainage. The department director may authorize up to eight feet where additional screening or security is warranted.
• Ground cover. Plantings must use low-profile native prairie species in a mix suited to the region and site soils.
• Screening. The county may require vegetative screening around a facility, but may not require earthen berms or similar structures.
• Setbacks. Facilities must meet the setback required for a principal structure in the underlying zoning district, unless waived by written consent of each affected nonparticipating property owner.

One nuance carries strategic weight. The state statute permits a setback of up to 150 feet from occupied community buildings and dwellings on nonparticipating properties, but Lake County’s ordinance does not impose it. The Zoning Board of Appeals may still adopt that setback as a condition of approval depending on the circumstances of a particular application.

Where Can Commercial Solar Be Located?

State law bars counties from adopting zoning regulations that disallow these facilities, permanently or temporarily, in any district permitting agricultural or industrial uses. In Lake County that produces a notably broad footprint:

• Agricultural uses are permitted in all residential and nonresidential zoning districts.
• Industrial uses are permitted only in the industrial districts.

The practical result is that eligible siting locations are wider in Lake County than developers often assume, though other requirements still govern whether a specific parcel works.

Preparing a Strong Commercial Solar Permit Application

Because approval follows from compliance rather than persuasion, the application itself carries the case. Effective preparation focuses on:

• Treating the Early Assistance meeting as a substantive design review rather than a formality.
• Documenting each quantitative standard directly, so the record leaves no open question on height, fencing, setbacks, or ground cover.
• Resolving Site Capacity and Site Plan Review issues early, since that approval gates later permits.
• Anticipating conditions the board may impose, including the statutory setback, and assessing their effect on project layout and economics.
• Confirming that the parcel is unincorporated and outside a municipality’s jurisdiction before committing to a site.

Objections at the hearing are common, but they cannot supply a basis for denial that the standards do not support. Birchwood Law advises solar developers and landowners on land use approvals in Lake County, including conditional use applications and hearings before the Zoning Board of Appeals. To discuss a commercial solar site, contact Birchwood Law.

This article is for general information and does not constitute legal advice. Requirements depend on the specific property and current code and statutory provisions.