ADUs are allowed in DallasTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Dallas, OR
Is your property eligible for an ADU?
# of Properties
5,869
Owner-occupied
79%
Zoning districts
10
Avg Home Value
$237,001
Median Lot Size
0.18 acres
Avg Income
$90,297
Residential Types:
5,869 housing units
Apts (4+ units)
5%
Condos
1%
Other
94%
Zoning Districts:
6,665 parcels · 10 districts
RL
75%(4,969)
RM
10%(673)
RH
6%(432)
I
3%(193)
Other
6%(398)
ADU Rules
What can you build in Dallas, OR?
Dallas, 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 800 sq ft
- –Maximum size of 50% of the primary dwelling's floor area (excluding the primary dwelling's garage)
Detached ADU Size Limits
- –Maximum size of 800 sq ft
- –Maximum size of one-half of the primary dwelling’s floor area
Max Units
- –1 ADU per legal lot (any ADU type)
Owner Occupancy
- –No owner-occupancy required.
Parking
- –0 spaces/ADU; no off-street parking required per Table 3.3.030A (Accessory Dwelling Unit - None)
Rental Restrictions
- –Short-term/vacation rentals: CUP required in RL/RM and prohibited in RH; Bed & Breakfast: CUP required and guest stays limited to 28 days per guest.
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.
Polk County