Accessory Dwelling Unit (ADU) Rules for Unincorporated McLean, IL

Is your property eligible for an ADU?

# of Parcels

18,204

Zoning districts

Median Parcel Size

9.99 acres

Zoning Districts:

18,448 parcels · 28 districts

75%(13,841)

R-1

20%(3,723)

R-2

2%(377)

1%(148)

Other

2%(359)

ADU Rules

What can you build in Unincorporated McLean, IL?

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

Eligibility

–Internal / Attached ADU: By Right
–Detached ADU: Not addressed in the local bylaw

Interior / Attached ADU Size Limits

–Maximum living space of 900 sq ft for an internal in-home apartment (guest household unit) within the principal dwelling.

Owner Occupancy

–Owner occupancy is not required.

Parking

–No ADU parking minimum or maximum; ADUs not established; general off-street parking standards apply (spaces must be on the same lot).

Rental Restrictions

–Rental of the ADU is prohibited; it cannot be rented short- or long-term.

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.

McLean County

Bloomington Normal

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