ADUs are allowed in La GrandeTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for La Grande, OR
Is your property eligible for an ADU?
# of Properties
3,762
Owner-occupied
64%
Zoning districts
16
Avg Home Value
$302,369
Median Lot Size
0.17 acres
Avg Income
$74,090
Residential Types:
3,762 housing units
Single Family
29%
Apts (4+ units)
3%
Other
68%
Zoning Districts:
5,065 parcels · 16 districts
R-2
64%(3,218)
R-3
11%(574)
GC
11%(553)
R-1
3%(158)
Other
11%(562)
ADU Rules
What can you build in La Grande, OR?
La Grande, 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
Detached ADU Size Limits
- –Maximum size of 800 sq ft for a detached ADU on a single-family lot.
- –Maximum size must be less than the residential living area of the primary single-family dwelling.
Max Units
- –Single-family lot: 1 detached ADU max.
- –Duplex or multifamily: 0 ADUs.
Owner Occupancy
- –There is no owner-occupancy requirement for ADUs.
Parking
- –No additional parking required for detached ADUs; overrides general residential standard; no other conditions.
Rental Restrictions
- –Short-term rentals: one permit per parcel; house + ADU cannot be rented to separate parties (must be the same party).
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.
Union County