ADUs are allowed in Grants PassTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Grants Pass, OR
Is your property eligible for an ADU?
# of Properties
13,601
Owner-occupied
60%
Zoning districts
25
Avg Home Value
$421,239
Median Lot Size
0.20 acres
Avg Income
$66,295
Residential Types:
13,601 housing units
Single Family
89%
2-3 Family
8%
Other
3%
Zoning Districts:
14,990 parcels · 25 districts
R-1-8
28%(4,214)
R-2
19%(2,803)
R-3
16%(2,405)
R-1-6
11%(1,686)
Other
26%(3,882)
ADU Rules
What can you build in Grants Pass, OR?
Grants Pass, 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 1,000 sq ft
- –ADU must be smaller than the primary dwelling
Detached ADU Size Limits
- –Maximum size of 1,000 sq ft for a detached accessory dwelling unit
Max Units
- –2 ADUs per lot for a single detached primary dwelling
- –1 ADU per lot for a commercial primary
- –ADUs not permitted on lots with duplex/triplex/quadplex or multi-dwelling primary
Owner Occupancy
- –Owner-occupancy is not required.
Parking
- –0 spaces; ADUs exempt from off-street parking per ORS 197.312(5)/Section 25.042; Development Code does not require off-street parking; if parking is provided, accessible parking requirements apply.
Rental Restrictions
- –Short-term ADU rentals allowed only with VRD permit/license; stays limited to 27 days in any 30-day period.
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