Building Setbacks & Zoning in Madison County, IL (2026)
2 rules for unincorporated Madison County, Illinois.
Verified from official government sources
Setback Rules
Unincorporated Madison County's zoning code sets fixed yard setbacks by residential district: R-1 requires 40-foot front and rear yards and a 25-foot side yard, while denser R-2 lots use a percentage-based side yard and allow more lot coverage.
Madison County Residential Yard Setbacks
Some RestrictionsMadison County Code § 93.025(B), (C)
(B) Conditions of use. ... (3) Front yard. A front yard of not less than 40 feet shall be provided. (4) Side yard. A side yard on each side of the zoning lot of not less than 25 feet, except where a side yard adjoins a street the minimum width of the yard shall be increased to 40 feet. (5) Rear yard. A rear yard of not less than 40 feet shall be provided. (6) Lot coverage. Not more th...
Lot Coverage Limits
In unincorporated Madison County's R-1 through R-4 single-family districts, Zoning Code § 93.025(B)(6) caps lot coverage at 15% of the zoning lot for all buildings and structures, including accessory buildings, and pairs it with a 0.3 maximum floor area ratio.
Madison County Residential Lot Coverage Cap
Some RestrictionsMadison County Code § 93.025(B)(6)-(7)
(6) Lot coverage. Not more than 15% of the area of a zoning lot may be covered by buildings or structures, including accessory buildings. (7) Maximum floor area ratio. The floor area ratio between gross floor area and zoning lot shall not exceed 0.3. The maximum floor area of accessory structures shall be no greater than two times the first-level floor area of the primary structure.
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