ADUs are allowed in The DallesTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for The Dalles, OR
Is your property eligible for an ADU?
# of Parcels
6,486
Zoning districts
9
Median Parcel Size
0.17 acres
Zoning Districts:
6,486 parcels · 9 districts
RH
44%(2,835)
RL
29%(1,906)
RM
11%(723)
CBC
6%(363)
Other
10%(659)
ADU Rules
What can you build in The Dalles, OR?
The Dalles, 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: the lesser of 75% of the primary dwelling’s gross floor area and 800 sq ft; on RL-zoned lots of at least 10,000 sq ft, the maximum is the lesser of 1,000 sq ft and 60% of the primary dwelling’s living area.
Detached ADU Size Limits
- –Maximum size is 75% of the primary dwelling’s gross floor area (excluding garages and unfinished basements) capped at 800 sq ft; on RL lots of 10,000 sq ft or more, the cap is the lesser of 1,000 sq ft or 60% of the primary dwelling’s living area.
Max Units
- –SF per lot: RL=1; RM/RH/NC/CBC=2 (1 detached + 1 internal/attached) if lot >= 5,000 sf; else 1; CG/CLI (existing nonconf. SF)=1
- –Duplex (RM/RH/NC/CBC): 1 detached (lot >= 5,000 sf)
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –0 for first ADU if primary parking met; 1 space for second ADU; garage conversion only if primary parking remains met
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.
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