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ADUs are allowed in Chicago
Types:DetachedInternal

Accessory Dwelling Unit (ADU) Rules for Chicago, IL

Is your property eligible for an ADU?

# of Properties
749,176
Owner-occupied
41%
Zoning districts
1514
Avg Home Value
$38,983
Median Lot Size
0.11 acres
Avg Income
$99,664
Residential Types:
749,176 housing units
Apts (4+ units)
2%
Other
98%
Zoning Districts:
885,863 parcels · 1,514 districts
RS-3
26%(226,942)
RS-2
19%(169,152)
RT-4
12%(108,660)
RM-5
5%(40,372)
Other
38%(340,737)

ADU Rules

What can you build in Chicago, IL?

Chicago, IL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.

Max Units

  • –1 ADU per building/lot
  • –Up to 33% of lawfully established dwelling units (fractions rounded: ≥0.5 up, <0.5 down)

Owner Occupancy

  • –Detached house must be owner-occupied at ADU pre-certification.

Rental Restrictions

  • –Short-term/transient rentals prohibited; long-term rentals allowed.

What's allowed on your lot?

These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.

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Is your property eligible for an ADU?

ADU rules in other Illinois municipalities

Rules change at the town line. Check the municipality your property is actually in.

Cook County

Arlington HeightsBerwynBlue IslandBuffalo GroveBurbankCalumet CityChicago HeightsCiceroDes PlainesDoltonElk Grove VillageElmwood ParkEvanstonEvergreen ParkGlencoeGlenviewHarveyHoffman EstatesHometownLansingMaywoodMelrose ParkMorton GroveMount Prospect
See all municipalities in Cook County →See all Illinois municipalities →
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