ADUs are allowed in CincinnatiTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Cincinnati, OH
Is your property eligible for an ADU?
# of Properties
77,231
Owner-occupied
37%
Zoning districts
168
Avg Home Value
$362,000
Median Lot Size
0.09 acres
Avg Income
$64,480
Residential Types:
77,231 housing units
2-3 Family
2%
Apts (4+ units)
92%
Other
6%
Zoning Districts:
163,931 parcels · 168 districts
SF-6
12%(20,003)
SF-4
8%(12,530)
SF-6-MH
6%(9,361)
SF-2
5%(8,875)
Other
69%(113,162)
ADU Rules
What can you build in Cincinnati, OH?
Cincinnati, OH 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 ADU size up to the finished square footage of the principal single-family dwelling (unfinished spaces excluded).
Detached ADU Size Limits
- –Maximum ADU size cannot exceed the finished square footage of the principal single-family dwelling (unfinished spaces excluded).
Max Units
- –1 ADU per single-family lot
- –0 ADUs per lot on duplex, multifamily, and other non-single-family lots
Owner Occupancy
- –Owner must reside on site in the principal dwelling or ADU
Parking
- –0 spaces/ADU; exempt from off-street parking; no spaces required; voluntary parking subject to general standards of Chapter 1425 (per § 1421-06(j))
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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Learn the key rules and size limits for ADUs
Is your property eligible for an ADU?
ADU rules in other Ohio municipalities
Rules change at the town line. Check the municipality your property is actually in.
Hamilton County
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