IL HB3288

Requires zoning units (counties, municipalities, townships) with populations of 100,000 or more to allow "middle housing" development—including duplexes to 8-plexes, cottage clusters, courtyard buildings, and townhouses—without imposing unreasonable costs, delays, or procedural barriers, effective June 1, 2026

Mandates that affected zoning units adopt land use ordinances and amend zoning maps to comply with middle housing requirements by June 1, 2026, and requires the Illinois Housing Development Authority (IHDA) to develop a model middle housing ordinance by January 1, 2026

Automatically applies IHDA's model ordinance to any zoning unit that fails to adopt compliant ordinances by the deadline, remaining in effect until the unit adopts its own qualifying ordinance

Allows IHDA to grant extensions for specific lots where water, sewer, storm drainage, or transportation services are significantly deficient, provided the zoning unit submits a remediation plan by December 31, 2025

Limits home rule authority by prohibiting local governments from regulating residential zoning in a manner inconsistent with the Act, and grants IHDA emergency rulemaking authority for implementation