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Accessory Structures
Accessory structures are detached, subordinate structures located on the same lot as a principal structure (such as a home or commercial business), where the use is incidental and accessory to that of the principal structure.

Small Sheds and other Minor Accessory Structures (120 Sq. Ft. or less)
  • May be placed in rear and side yards up to the property line and near buildings or structures.
  • May not be placed in the front setback.

Garages, Sheds, Carports, and other Major Accessory Structures (greater than 120 Sq. Ft.)
  • Front setback: 25 feet
  • Side street front setback, corner lot: 25 feet (exception for small lots prior to 1991: 10 feet)
  • Side yard setback (if located behind rear building line of the principal structure): 3 feet
  • Side yard setback (if not behind rear building line of principal structure): 5 feet 
  • Sum side yards: 25% lot width
  • Rear setback: 5 feet
  • Maximum height: 15 feet to coping (flat roof), deck line (mansard roof), or average height (midpoint) of highest gable
  • Maximum lot coverage: Coverage of principal structure or 30% of rear yard setback, whichever is less.
  • Minimum building separation: 6 feet

Decks and Elevated Patios (uncovered)
  • Allowed in side & rear yard setbacks
  • Setback: 3 feet from any property line

Patios (not more than 1 foot above grade)
  • Allowed in all yard setbacks
  • Minimum 50% front landscape surface ratio

Swimming Pools & Recreation Courts
  • Allowed in side and rear setbacks.
  • Minimum 3 feet from all property lines
  • Pool fence enclosure required by building code (for regulations,contact Building Division, 309.524.2370)

Additional Info
  • A setback is the narrowest distance permitted from a property line to a structure, measured to the exterior building wall or nearest structural member.
  • Permit not required for small sheds and most structures less than 120 Sq. Ft.
  • Garages, carports, and additions attached to homes and other principal structures have greater setbacks.  Contact the Land Development Division for more information.
  • This is a partial list only; other limitations exist.
  • Printable accessory structure handout (PDF)
  • Site plan and development review information