# Illinois SB4071: MUNI CD-ACCESSORY DWELLINGS

Illinois SB4071, MUNI CD-ACCESSORY DWELLINGS, is a 104th General Assembly (2025–2026) Senate bill sponsored by Robert F. Martwick (Democratic); status in committee, last action 2026-03-13 (Added as Co-Sponsor Sen. Steve Stadelman) (as of 2026-11-01).

- Canonical: https://policyrisk.com/state-bill/IL-SB4071-2025-2026
- As of: 2026-11-01
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: Illinois SB4071
- State: Illinois
- Session: 104th General Assembly (2025–2026)
- Title: MUNI CD-ACCESSORY DWELLINGS
- Status: in committee
- Chamber: Senate
- Introduced: 2026-02-24
- Last action: 2026-03-13, Added as Co-Sponsor Sen. Steve Stadelman
- Sponsor: Robert F. Martwick (Democratic)
- Cosponsors: 8
- Subjects: assignments
- Touches household money: no
- Economic provisions PRIA read: 0

## 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 overview

No economic impacts identified for this bill.

## Sponsors and cosponsors

- Sponsor: Robert F. Martwick (Democratic), Senate
- Cosponsor: Adriane L. Johnson (Democratic), Senate
- Cosponsor: David Koehler (Democratic), Senate
- Cosponsor: Javier L. Cervantes (Democratic), Senate
- Cosponsor: Mark L. Walker (Democratic), Senate
- Cosponsor: Mattie Hunter (Democratic), Senate
- Cosponsor: Robert Peters (Democratic), Senate
- Cosponsor: Sara Feigenholtz (Democratic), Senate
- Cosponsor: Steve Stadelman (Democratic), Senate

## Actions (11)

- 2026-03-13: Added as Co-Sponsor Sen. Steve Stadelman (Senate)
- 2026-03-10: Added as Co-Sponsor Sen. Robert Peters (Senate)
- 2026-03-06: Added as Chief Co-Sponsor Sen. Javier L. Cervantes (Senate)
- 2026-03-06: Added as Chief Co-Sponsor Sen. Adriane L. Johnson (Senate)
- 2026-03-06: Added as Chief Co-Sponsor Sen. Mattie Hunter (Senate)
- 2026-03-05: Added as Co-Sponsor Sen. Sara Feigenholtz (Senate)
- 2026-03-05: Added as Co-Sponsor Sen. Mark L. Walker (Senate)
- 2026-03-05: Added as Chief Co-Sponsor Sen. David Koehler (Senate)
- 2026-02-24: Referred to Assignments (Senate)
- 2026-02-24: First Reading (Senate)
- 2026-02-24: Filed with Secretary by Sen. Robert F. Martwick (Senate)

## Bill text

- Introduced: [PDF](https://www.ilga.gov/documents/legislation/104/SB/PDF/10400SB4071.pdf)

## Related bills

- HB5198: AFFORDABLE HOUSING-CILAS (passed house)
- SB1937: PENSION CODE-VARIOUS (passed senate)
- HB2563: CONDO-RESERVE STUDY (in committee)
- HB4701: LIMITATIONS FACILITY FEES ACT (in committee)
- SB3008: DHS-ABLE PROGRAM INFO MATERIAL (passed senate)
- SB3484: VEH CD-PLATES-REGISTRATION (signed)

## Sources
- [Introduced (PDF)](https://www.ilga.gov/documents/legislation/104/SB/PDF/10400SB4071.pdf)

## Related
- [HB5198: AFFORDABLE HOUSING-CILAS](https://policyrisk.com/state-bill/IL-HB5198-2025-2026)
- [SB1937: PENSION CODE-VARIOUS](https://policyrisk.com/state-bill/IL-SB1937-2025-2026)
- [HB2563: CONDO-RESERVE STUDY](https://policyrisk.com/state-bill/IL-HB2563-2025-2026)
- [HB4701: LIMITATIONS FACILITY FEES ACT](https://policyrisk.com/state-bill/IL-HB4701-2025-2026)
- [SB3008: DHS-ABLE PROGRAM INFO MATERIAL](https://policyrisk.com/state-bill/IL-SB3008-2025-2026)
- [SB3484: VEH CD-PLATES-REGISTRATION](https://policyrisk.com/state-bill/IL-SB3484-2025-2026)
- [Illinois bills](https://policyrisk.com/states/illinois/bills)
- [Illinois state hub](https://policyrisk.com/states/illinois)
- [All state legislation](https://policyrisk.com/state-bills)

Source: PRIA, https://policyrisk.com/state-bill/IL-SB4071-2025-2026 (as of 2026-11-01).