Skokie, IL Accessory Structures: ADU Rules (2026)

Skokie's zoning code restricts single-family residential districts (R-1 and R-2) to one dwelling unit per lot. Accessory structures may not contain a second dwelling unit with independent cooking, sleeping, and sanitation facilities. Two-flat (R-3) and multi-family districts permit multiple dwellings as the principal use. Creating a second dwelling unit within or behind a single-family home without a zoning change or variance is generally prohibited. Unlike Evanston and Chicago, both of which adopted ADU ordinances in recent years, Skokie has not formally authorized residential ADUs village-wide. The Skokie Plan Commission has at times discussed ADU policy in the context of housing affordability and changing household needs, but no broad authorization has been codified. Legacy second units that predate zoning may continue as legal nonconforming uses if documented. Homeowners interested in creating a legal ADU typically need to apply for a zoning variance or special use permit through the Zoning Board of Appeals, which is a discretionary process. Cook County property tax assessments may also be affected by adding a second dwelling unit.