IL HB5626

Municipalities must allow multiple dwelling units on residential lots based on lot size: 1 unit on lots up to 2,500 sq ft, up to 4 units on lots 2,500-5,000 sq ft, up to 6 units on lots 5,000-7,500 sq ft, and up to 8 units on lots over 7,500 sq ft, including cottage clusters.

Accessory dwelling units must be permitted in all single-family zoning districts without additional requirements for lot size, setbacks, aesthetics, design review, or other controls beyond those for single-family homes.

Beginning January 1, 2027, municipalities cannot establish minimum parking requirements for residential dwellings under 1,500 sq ft, affordable housing projects, assisted living establishments, ground-level commercial in mixed-use buildings, or conversions from nonresidential to residential use.

Residential buildings up to 6 stories with no more than 4 units per floor may use a single stairway exit if equipped with sprinklers, smoke detection, self-closing doors, and emergency escape openings in each unit, effective January 1, 2027.

Municipalities authorized to levy impact fees must calculate them using statewide formulas issued by the Department of Commerce and Economic Opportunity, with mandatory exemptions for affordable housing, supportive housing, transitional housing, and accessory dwelling units.