Lake County, IL Solar Energy: Panel Permits (2026)
Key Facts
- Governs
- Unincorporated Lake County only
- Roof-mounted panels
- Building permit only, no CUP
- Ground-mounted by-right cap
- 5% of lot or 500 sq ft
- Larger ground systems
- Conditional use permit required
- Max height, residential
- 10 ft (up to 15 ft by director)
Summary
Roof-mounted solar panels need only standard building permits; small ground-mounted systems on residential lots are permitted by right up to 500 sq ft, larger ones need a conditional use permit.
(U) Accessory solar energy systems. (1) Types. (a) Roof-mounted. Building-mounted solar energy systems may be mounted on accessory or principal structures in all zoning districts. All applicable accessory or principal structure requirements apply to building-mounted solar energy systems. ... b. Accessory small-scale solar energy systems that are accessory to a residential use that do not exceed 5% of the net buildable area of a lot, or 500 square feet, whichever is less, shall be permitted by right.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-15: Supplement contains: Local legislation current through Ord. 26-0618, passed 6-9-2026 | State legislation current through ILCS Pamphlet 2025 #5).
Full Breakdown
In unincorporated Lake County, Illinois, roof- and building-mounted solar panels follow standard accessory- or principal-structure permitting under UDO § 151.113(U): no special zoning approval beyond the building permit. Small-scale ground-mounted systems on a residential lot are permitted by right if they cover 5% or less of the net buildable area or 500 square feet, whichever is less; anything larger, or any medium/large-scale ground-mounted system, requires a conditional use permit reviewed by the Zoning Board of Appeals. A site development permit may also be required depending on the footings and site disturbance involved.
Violations & Fines
Installing a ground-mounted system above the by-right threshold without first obtaining a conditional use permit is a zoning violation enforceable by the Planning, Building and Development Department.
Frequently Asked Questions
Do I need a special permit for rooftop solar in unincorporated Lake County?
When does a ground-mounted home solar array need a conditional use permit?
Sources & Official References
Other rules in Lake County
Compare Lake County to another location·View the Illinois solar energy overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.