How Accessory Dwelling Units Are Quietly Reshaping Chicago’s Neighborhoods
Cities rarely change all at once. More often, they evolve quietly, one home at a time, one block at a time, until suddenly the landscape feels different and the future feels possible in ways it didn’t before. Chicago is living through one of those subtle transformations today, and it centers on a housing form that is far from new, yet newly liberated: the Accessory Dwelling Unit , or ADU. Coach houses. Garden apartments. In-law suites. Basement flats. For decades, these small, secondary housing units existed in Chicago’s neighborhoods, sometimes legally, sometimes informally, always filling a need that standard zoning never fully accounted for. They provided affordable housing, extra income for homeowners, multi-generational living options, and quiet density long before planners coined the term “gentle density.” But for more than half a century, Chicago’s zoning code largely prohibited new ADUs. Neighborhoods that once naturally contained them were frozen, legally speaking, in a 1950s ...