Madison County, IL Building Setbacks & Zoning: Setback Rules (2026)

025 governs the R-1 through R-4 Single-Family Residential Districts and lists separate conditions of use for each. In the R-1 district (division (B)), every detached dwelling needs a front yard of not less than 40 feet, side yards of not less than 25 feet on each side (increased to 40 feet where a side yard adjoins a street), and a rear yard of not less than 40 feet; lot coverage by buildings and structures, including accessory buildings, cannot exceed 15% of the lot. In the R-2 district (division (C)), the front and rear yard minimums stay at 40 feet, but the side yard drops to 10% of the lot's width at the building line (again increased to 40 feet on a street-side yard), and lot coverage rises to 30%.

064 layers exceptions on top of these base numbers: cornices and chimneys may project 2 feet into a required yard, open porches up to 6 feet, fire escapes up to 4 feet, and canopies or eaves up to 4 feet. 064(A)(6) lets new construction match that average, provided it is not less than 20 feet or more than 35 feet. All setback figures are measured to the same standard on every corner lot: the yard fronting the addressed street counts as the front yard, and the other street-facing yard must still meet the primary structure's front-yard setback.