ADUs are allowed in Unincorporated JosephineTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Josephine, OR
Is your property eligible for an ADU?
# of Properties
16,672
Owner-occupied
59%
Zoning districts
37
Avg Home Value
$393,769
Median Lot Size
2.53 acres
Avg Income
$68,447
Residential Types:
16,672 housing units
Single Family
5%
2-3 Family
2%
Apts (4+ units)
93%
Zoning Districts:
25,734 parcels · 37 districts
RR5
46%(11,805)
RR2.5
10%(2,534)
WR
9%(2,430)
FC
9%(2,350)
Other
26%(6,615)
ADU Rules
What can you build in Unincorporated Josephine, OR?
Unincorporated Josephine, OR 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 900 sq ft for an internal or attached ADU
Detached ADU Size Limits
- –Maximum detached ADU size of 900 sq ft.
Max Units
- –1 ADU per lot or parcel (RR zones).
- –Historic-home conversion ADU: total limit 1 ADU on the lot.
Owner Occupancy
- –Owner occupancy not required
Parking
- –No ADU-specific parking requirement; if parking is provided, must follow general rules: off-street parking on-site or within 400 ft on the same lot/ownership; front-yard parking prohibited; parking area design standards apply.
Rental Restrictions
- –Short-term/vacation rentals prohibited; ADU may not be used for vacation occupancy per ORS 90.100.
ADU State Law
What can you build in Oregon?
- –In urban growth areas, Oregon law requires cities and counties to allow at least one ADU on lots zoned for detached single-family homes.
- –Local jurisdictions cannot require owner occupancy for ADUs, but may regulate short-term or vacation rentals.
- –There are no statewide limits on ADU size, height, setbacks, lot size, or floor area ratio. Local zoning rules apply.
- –Parking requirements, if any, are set by the local jurisdiction, subject to state limitations.
- –Some cities may allow more than one ADU per lot, depending on local code.
- –Oregon law does not require counties to allow ADUs in rural residential zones. Whether an ADU is allowed depends on county zoning.
- –ADUs in rural residential areas cannot be used for short-term or vacation rentals.
- –Additional requirements may apply related to wildfire risk, water supply, septic capacity, and fire access.
- –Counties may impose additional restrictions beyond state law or choose not to allow ADUs at all.
- –If a county allows ADUs, state law imposes strict limits, including a minimum 2-acre lot size, a maximum ADU size of 900 sq ft, a location within 100 ft of the primary dwelling, and a limit of one ADU per parcel.
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 Oregon municipalities
Rules change at the town line. Check the municipality your property is actually in.
Josephine County