ADUs are allowed in North PlainsTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for North Plains, OR
Is your property eligible for an ADU?
# of Properties
1,800
Owner-occupied
76%
Zoning districts
12
Avg Home Value
$466,435
Median Lot Size
0.11 acres
Avg Income
$121,624
Residential Types:
1,800 housing units
Other
100%
Zoning Districts:
1,930 parcels · 12 districts
NC
37%(712)
R-2.5
19%(369)
R-5
18%(346)
R-7.5
14%(263)
Other
12%(240)
ADU Rules
What can you build in North Plains, OR?
North Plains, 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 detached ADU floor area must be smaller than the existing primary structure.
Max Units
- –1 ADU per lot
Owner Occupancy
- –Owner-occupancy not required.
Parking
- –No ADU-specific parking minimums or maximums; general citywide provisions apply (e.g., on-street parking credits and garages may count toward minimums where applicable).
Rental Restrictions
- –Short-term rentals (30 days or less) allowed with STR permit; standards apply. No limits on long-term renting.
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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Is your property eligible for an ADU?
ADU rules in other Oregon municipalities
Rules change at the town line. Check the municipality your property is actually in.
Washington County