The Illinois Plat Act is an alternative way to subdivide property within the county. Please contact the Maps and Plats Department at (618) 296-4586 to determine if your property is eligible to be subdivided under the act. Please note that all properties subdivided via the Plat Act must comply with the Madison County Zoning Ordinance.

A minor subdivision is a division of land into two (2) but not more than four (4) lots, all of which front upon an existing street and will not involve any new streets or improvements. Minor subdivisions do not require a preliminary plat. Major subdivisions are a division of land into five (5) or more lots and require roadways and improvements. Major subdivisions require submittal of a preliminary plat, improvement plans, and a final plat. All subdivisions require review and approval by the Planning and Development Committee.

Before submitting a preliminary plat, the subdivider is encouraged to meet with staff to discuss preplanning activities and to obtain information and guidance before entering into binding commitments or incurring substantial expense in the preparation of detailed plans, surveys, and other data. A sketch plan is extremely useful at this stage.

“A” Agriculture District
• Lots must have an area of at least two (2) acres and a width at the established building line of at least 150 feet.

“R-1” Single-Family Residential District
• Lots must have an area of at least 40,000 square feet and a width at the established building line of at least 150 feet.

“R-2” Single-Family Residential District
• Lots must have an area of at least 15,000 square feet and a width at the established building line of at least 100 feet.

“R-3” Single-Family Residential District
• Lots must have an area of at least 9,000 square feet, and a width at the established building line of at least 70 feet.

“R-4” Single-Family Residential District
• Lots must have an area of at least 6,000 square feet, and a width at the established building line of at least 50 feet.

You must provide the following items to have your final plat recorded:

• Three (3) signed Mylar copies of the final plat
• Four (4) signed paper copies of the final plat
• A copy of the approved covenants and restrictions
• A signed copy of all maintenance agreements for easements, if applicable
• Authorization letter from the surveyor permitting the plat to go on the record