Illinois SB 4071: MUNI CD-ACCESSORY DWELLINGS

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104TH GENERAL ASSEMBLY 
State of Illinois 
2025 and 2026
SB4071

Introduced 2/24/2026, by Sen. Robert F. Martwick 

SYNOPSIS AS INTRODUCED:

65 ILCS 5/11-13-30 new

 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.

LRB104 20887 RTM 34559 b

A BILL FOR

SB4071LRB104 20887 RTM 34559 b

1 AN ACT concerning local government.

2 Be it enacted by the People of the State of Illinois, 

3represented in the General Assembly:

4 Section 5. The Illinois Municipal Code is