Kendall County, IL Building Setbacks & Zoning: Lot Coverage Limits (2026)

Kendall County Code Section 36-333 caps lot coverage at 10 percent of the zoning lot's total area for the R-1 One-Family Residential District, the base residential district applied to unincorporated land outside the county's cities and villages. The cap counts the footprint of every building and structure on the lot, including accessory buildings such as detached garages, barns or sheds regulated separately under the accessory-use standards of Section 36-971. Because R-1 lots must already run at least 130,000 square feet under the district's minimum lot-size rule in Section 36-331, the 10 percent cap translates to a substantial minimum buildable footprint even before yard setbacks under Section 36-332 are applied, reflecting the district's very low density, large-lot character.

The lot-coverage cap sits alongside the yard and height standards as one of the three core bulk controls (Sections 36-332 through 36-334) that define how much of an R-1 parcel can be built on and how tall the resulting structures can rise, and it applies uniformly to the principal residence and any accessory buildings placed on the same zoning lot.