ADUs are allowed in BloomingtonTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Bloomington, IL
Is your property eligible for an ADU?
# of Parcels
26,041
Zoning districts
28
Median Parcel Size
0.20 acres
Zoning Districts:
27,653 parcels · 28 districts
R-1C
41%(11,416)
R-2
21%(5,746)
R-1B
20%(5,558)
B-1
4%(1,124)
Other
14%(3,809)
ADU Rules
What can you build in Bloomington, IL?
Bloomington, 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: By Right
Interior / Attached ADU Size Limits
- –Maximum size of 800 sq ft
- –Maximum size of 50% of the size of the primary building
Detached ADU Size Limits
- –Maximum detached ADU size is the most restrictive of: 800 sq ft or 50% of the primary building’s size; 30% of the rear yard; in AG, R‑1A/B/C, R1‑H, R‑2, or R‑4, also not more than the principal building’s ground floor or 1,000 sq ft; and in R‑3A/R‑3B/Business/Manufacturing/Public Interest, any remaining site gross floor area allowed by district rules.
Max Units
- –0 ADUs per lot for duplex, multifamily, or other principal structures
Owner Occupancy
- –Owner must occupy the primary residence.
Parking
- –1 space/ADU; citywide max 125% of required spaces (GAP max 10% over min); reductions/credits: 10% off within 1,320 ft of transit; 1 space credit per 2 on-street spaces within 500 ft; 3 public spaces may substitute for 1; ADU cannot be in front yard; tandem with primary space prohibited.
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