Illinois · Senate Bill 4071 · 104th General Assembly

MUNI CD-ACCESSORY DWELLINGS

  1. Introduced Feb 24, 2026
  2. In committee Feb 24, 2026
  3. Passed the Senate Next
  4. Passed the House  
  5. To the governor  
  6. Became law  

What it does

The legislature's own summary of the bill, or its official long title.

Amends the Illinois Municipal Code. Provides that, beginning January 1, 2027, each municipality shall, by ordinance, authorize the development of accessory dwelling units. Provides that each municipality shall permit accessory dwelling units in all zoning districts that permit single-family dwellings without additional requirements for lot size, setbacks, aesthetic requirements, design review requirements, frontage…

Read the full title (194 words)

Amends the Illinois Municipal Code. Provides that, beginning January 1, 2027, each municipality shall, by ordinance, authorize the development of accessory dwelling units. Provides that each municipality shall permit accessory dwelling units in all zoning districts that permit single-family dwellings without additional requirements for lot size, setbacks, aesthetic requirements, design review requirements, frontage, space limitations, or other controls beyond those required for single-family dwelling units without an accessory dwelling unit. Provides that a municipality is not required to allow more than one accessory dwelling unit for any single-family dwelling. Provides that accessory dwelling units may be constructed at the same time as the principal dwelling unit. Provides that no municipality shall: (A) require additional automobile parking spaces for a property with an accessory dwelling unit beyond the requirements for a single-family dwelling unit without an accessory dwelling unit; (B) require the establishment of a familial relationship between the occupants of an accessory dwelling unit and the occupants of a principal dwelling unit; or (C) establish a minimum or maximum limit on (i) square footage of an accessory dwelling unit or (ii) the number of bedrooms of an accessory dwelling unit. Limits home rule powers.

Every action

11 steps, oldest first, as the legislature records them.

  1. SenateFiled with Secretary by Sen. Robert F. Martwick
  2. SenateFirst Reading
  3. CommitteeReferred to Assignments · Senate Assignments
  4. SenateAdded as Chief Co-Sponsor Sen. David Koehler
  5. SenateAdded as Co-Sponsor Sen. Mark L. Walker
  6. SenateAdded as Co-Sponsor Sen. Sara Feigenholtz
  7. SenateAdded as Chief Co-Sponsor Sen. Mattie Hunter
  8. SenateAdded as Chief Co-Sponsor Sen. Adriane Johnson
  9. SenateAdded as Chief Co-Sponsor Sen. Javier L. Cervantes
  10. SenateAdded as Co-Sponsor Sen. Robert Peters
  11. SenateAdded as Co-Sponsor Sen. Steve Stadelman

Roll calls

No recorded votes on this bill yet.

Sponsors

The member who introduced it, joined by 8 cosponsors: 8 Democrats.

All 8 cosponsors

From Illinois's official records (www.ilga.gov), checked Nov 2, 2026. Text links go to the official versions; LegiList does not copy bill text.