Building Safety in Madison County, IL (2026)
5 rules for unincorporated Madison County, Illinois.
Verified from official government sources
Fire Sprinkler Requirements
Unincorporated Madison County adopted the 2012 International Residential Code for home construction but specifically carved out Section R314, the Automatic Fire Sprinkler System requirement, along with R501.3. New single-family and duplex homes built under the county's adopted code are not required to install residential fire sprinklers.
Madison County Fire Sprinkler Exemption
Few RestrictionsMadison County Code § 90.16(A)(2)
§ 90.16 BUILDING CODES AND REGULATIONS ADOPTED BY REFERENCE. (A) The following Codes are adopted by reference and made a parte hereof as if appearing in total: ... (2) 2012 International Residential Code (IRC, in its entirety except Section R314 “Automatic Fire Sprinkler System” and R501.3 and its exceptions;
Childcare Center Rules
Where a nursery school is a permitted zoning use in unincorporated Madison County, § 93.088 requires at least 50 square feet of indoor floor space per child, on top of any area used for sleeping, plus at least 100 square feet of fenced outdoor play area per child. Both figures are per-child minimums, not building totals.
Madison County Nursery School Space Standards
Some RestrictionsMadison County Code § 93.088
In any district where nursery schools are permitted, the following requirements shall be met. (A) For each child at east 50 square feet of floor space shall be provided in addition to that provided for sleeping purposes. (B) For each child at least 100 square feet of outdoor, enclosed (fenced) play area shall be provided.
Building Permits
In unincorporated Madison County, any accessory building or structure covering 200 square feet or more requires a building permit before construction. Smaller accessory structures skip the permit but still must meet the county's setback rules. The Planning and Development Department administers permits, and the County Board can even halt new permits area-wide if health or safety is threatened.
Madison County Building Permit Threshold
Some RestrictionsMadison County Code § 93.007(B)
ACCESSORY BUILDING or STRUCTURE. A detached subordinate building or structure, the use of which is customarily incidental to that of the main use of the land and which is located on the same lot with the main building or use. Structures under 200 square feet are not subject to a building permit but must meet accessory structure setback requirements as per § 93.051.
Electrical Permits
Electrical work on construction in unincorporated Madison County must follow the 2005 National Electric Code, which the County Board adopted by reference alongside its building, residential, fire, mechanical and plumbing codes. The Building and Zoning Department keeps certified copies on file at the County Clerk's office for public inspection.
Madison County Adopted Electrical Code
Some RestrictionsMadison County Code § 90.16(A)(4)
§ 90.16 BUILDING CODES AND REGULATIONS ADOPTED BY REFERENCE. (A) The following Codes are adopted by reference and made a parte hereof as if appearing in total: ... (4) 2005 National Electric Code;
Plumbing Permits
Plumbing installations for construction in unincorporated Madison County must follow the Illinois Plumbing Code, which the County Board adopted by reference in its Building Regulations chapter alongside the building, residential, electrical and other construction codes. Permits and inspections run through the county's Planning and Development / Building and Zoning Department.
Madison County Adopted Plumbing Code
Some RestrictionsMadison County Code § 90.16(A)(7)
§ 90.16 BUILDING CODES AND REGULATIONS ADOPTED BY REFERENCE. (A) The following Codes are adopted by reference and made a parte hereof as if appearing in total: ... (7) Illinois Plumbing Code;
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