ADUs are allowed in Unincorporated AdaTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Ada, ID
Is your property eligible for an ADU?
# of Properties
21,319
Owner-occupied
83%
Zoning districts
44
Avg Home Value
$599,163
Median Lot Size
0.29 acres
Avg Income
$113,130
Residential Types:
21,319 housing units
Single Family
1%
Other
99%
Zoning Districts:
27,786 parcels · 44 districts
R6
14%(3,915)
R8
14%(3,795)
RUT
12%(3,245)
RR
11%(3,055)
Other
50%(13,776)
ADU Rules
What can you build in Unincorporated Ada, ID?
Unincorporated Ada, ID 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 habitable size of 1,200 sq ft or 60% of the primary dwelling’s footprint, whichever is less.
Detached ADU Size Limits
- –Maximum size of 1,200 sq ft or 60% of the primary dwelling’s footprint, whichever is less
Owner Occupancy
- –Either the principal dwelling or the ADU must be owner-occupied.
Parking
- –1 space per ADU; off-street parking for the ADU must be in addition to the primary dwelling and on the same lot; no tandem parking; joint-use or alternative parking plans may be approved; required counts may be adjusted with discretionary approval.
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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ADU rules in other Idaho municipalities
Rules change at the town line. Check the municipality your property is actually in.
Ada County