Kane County, IL Building Setbacks & Zoning: Structure Height Limits (2026)
Key Facts
- Accessory buildings
- Max two detached per residence
- Lots ≤2 acres
- 900 sq ft combined
- Lots 2–5 acres
- 1,800 sq ft combined
- Order
- No accessory before principal building
- Principal height
- Per zoning district
Summary
Kane County limits accessory buildings by number and combined floor area rather than a published height table, and no more than two detached accessory buildings are permitted per residence. Maximum principal-building height is set by the zoning district in the Kane County Zoning Ordinance.
Not more than (2) detached buildings accessory to a residence are permitted. On lots of (2) acres or less, the detached accessory buildings or structures shall not exceed a combined total of (900) square feet in total floor area under roof.
Full Breakdown
The county's accessory-building rules cap intensity by count and floor area: not more than two detached buildings accessory to a residence are permitted; on lots of 2 acres or less the detached accessory buildings may not exceed a combined 900 square feet of floor area under roof; on lots over 2 but under 5 acres, a combined 1,800 square feet. No accessory building may be built before the principal building it serves. Maximum building height for principal structures is governed by the applicable zoning district (for example F1 Rural Residential) in the Kane County Zoning Ordinance; the county administers those district height standards through the Building & Zoning Division rather than in the online accessory packet.
Violations & Fines
Exceeding the two-building limit or combined floor-area caps, or building an accessory structure before the principal building, is a zoning violation subject to correction or denial of approval.
Frequently Asked Questions
How many sheds or garages can I have?
What is the maximum house height?
Sources & Official References
Other rules in Kane County
Compare Kane County to another location·View the Illinois building setbacks & zoning overview
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