Illinois 104th General Assembly Status: Introduced 9 D cosponsors

SB4071      — MUNI CD-ACCESSORY DWELLINGS

Last action — Added as Co-Sponsor Sen. Steve Stadelman

  1. 1
    Introduced
  2. 2
    In Committee
  3. 3
    Passed Senate
  4. 4
    Passed House
  5. 5
    To Executive
  6. 6
    Enacted

This bill has been introduced in the Senate. Introduced February 24, 2026. It must pass committee before a floor vote.

Next likely step: a committee referral and hearing.

Odds of enactment

Low chance

Based on the sponsor, cosponsors, and committee posture, this bill has a low chance of becoming law.

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A statistical estimate from our own model of past outcomes — an insight, not a guarantee. Policymaking is volatile.

Prognosis

Not enough signal yet

Not enough signal yet to read this bill's trajectory — we surface a likelihood only once there's real movement (stage, sponsorship, committee, or votes) to point to.

Based on stage, sponsorship breadth, committee status, recorded votes, and cross-state momentum — a description of the observable signals, not a prediction.

Summary

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.

Bill Text

We don't have the full text on file for this bill yet.

Read SB4071 on the official Illinois source →

Action History

  1. Added as Co-Sponsor Sen. Steve Stadelman

  2. Added as Co-Sponsor Sen. Robert Peters

  3. Added as Chief Co-Sponsor Sen. Javier L. Cervantes

  4. Added as Chief Co-Sponsor Sen. Adriane L. Johnson

  5. Added as Chief Co-Sponsor Sen. Mattie Hunter

  6. Added as Co-Sponsor Sen. Sara Feigenholtz

  7. Added as Co-Sponsor Sen. Mark L. Walker

  8. Added as Chief Co-Sponsor Sen. David Koehler

  9. Referred to Assignments

  10. First Reading

  11. Filed with Secretary by Sen. Robert F. Martwick

Sponsors

Sponsorship breakdown

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1 sponsors · 8 co-sponsors · 174 not signed on

Sponsors (1)

Co-sponsors (8)

Not signed on (174)

174 members have not signed on to this bill.

Show all 174 →

"Not signed on" means a member has not sponsored or co-sponsored this bill — it does not imply opposition. Members flagged Voted No have a recorded No vote on this bill.

Whip count is in markup. Polling the chamber and every recorded vote this session. Only the first open is slow. It’s instant for you after this. Calling the roll · Tallying · Engrossing

Subjects

housing
Cross-referencing the record. Reading this bill against every other bill in the corpus by meaning, not keywords. Only the first open is slow. It’s instant for you after this. Matching · Ranking · Engrossing

Frequently asked questions

What does SB4071      do?
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.
Who sponsors SB4071     ?
SB4071      is sponsored by Robert F. Martwick (Democrat), David Koehler (Democrat), Mattie Hunter (Democrat), Adriane L. Johnson (Democrat), Javier L. Cervantes (Democrat), Mark L. Walker (Democrat), Sara Feigenholtz (Democrat), Robert Peters (Democrat), and Steve Stadelman (Democrat).
What is the current status of SB4071     ?
This bill has been introduced in the Senate. Introduced February 24, 2026. It must pass committee before a floor vote.
Where can I track SB4071     ?
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