Kane County, IL Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Kane County, IL, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Combined cap (≤2 acres)
- 900 sq ft
- Combined cap (2–5 acres)
- 1,800 sq ft
- Max detached structures
- Two per lot
- Yard occupancy limit
- 25% of required yard
- Governing section
- KCZO 25-5-9-5
Summary
In unincorporated Kane County, detached accessory buildings such as sheds are limited to a combined 900 square feet on lots of two acres or less, and 1,800 square feet on lots between two and five acres. Sheds must meet yard setbacks; a building permit is required.
On lots of two (2) acres or less in size, none of the detached accessory buildings or structures shall exceed a combined total of nine hundred (900) square feet in total floor area under roof. On lots greater than two (2) acres in size but less than five (5) acres in size, none of the detached buildings or structures shall exceed a combined total of one thousand eight hundred (1,800) square feet in total floor area under roof.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-17: Code current through: Ord. 26-183, passed 4-14-2026).
Full Breakdown
Under Zoning Ordinance 25-5-9-5, on lots of two acres or less all detached accessory structures together cannot exceed 900 square feet of floor area under roof; on lots over two but under five acres the combined cap is 1,800 square feet. Section 25-5-9-2 requires detached accessory buildings to be no closer than five feet to any other building, bars them from required corner-lot side yards, and prohibits them from occupying more than 25 percent of a required yard. No accessory building may be built before the principal house. Kane County requires a building permit for sheds; verify exact setbacks with the Development Department.
Violations & Fines
Oversized, unpermitted, or improperly located sheds are zoning violations subject to stop-work orders, mandatory removal or resizing, and daily fines under Chapter 25 enforcement.
Frequently Asked Questions
Do I need a permit for a small shed?
How big can my shed be?
Sources & Official References
Other rules in Kane County
How Kane County compares: Shed Permit Requirements by City·Compare Kane County to another location·View the Illinois accessory structures overview
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