ADUs are allowed in CaldwellTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Caldwell, ID
Is your property eligible for an ADU?
# of Parcels
27,431
Zoning districts
21
Avg Parcel Value
$484,826
Median Parcel Size
0.17 acres
Zoning Districts:
27,935 parcels · 21 districts
R-1
65%(18,021)
R-2
19%(5,427)
M-1
3%(714)
R-3
2%(657)
Other
11%(3,116)
ADU Rules
What can you build in Caldwell, ID?
Caldwell, 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 internal ADU size of 900 sq ft
- –Maximum internal ADU size of 75% of the principal residence’s floor area
Detached ADU Size Limits
- –Maximum size of 900 sq ft for a detached accessory dwelling unit (backyard cottage).
- –Maximum size of 75% of the principal dwelling’s floor area for a detached accessory dwelling unit (backyard cottage).
Parking
- –0–1 spaces/ADU; Director may adjust ±50%; Downtown may reduce to 1/2 with full 10-02-05 requirements; Steunenberg Historic District: detached garage conversion allowed only if off-street parking is maintained per 10-02-05.
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.
Canyon County