ADUs are allowed in DaytonTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Dayton, OR
Is your property eligible for an ADU?
# of Properties
835
Owner-occupied
67%
Zoning districts
8
Avg Home Value
$397,927
Median Lot Size
0.19 acres
Avg Income
$91,884
Residential Types:
835 housing units
Single Family
86%
2-3 Family
1%
Apts (4+ units)
1%
Other
12%
Zoning Districts:
953 parcels · 8 districts
R-2
50%(473)
R-1
38%(358)
CR
5%(44)
C
4%(42)
Other
4%(36)
ADU Rules
What can you build in Dayton, OR?
Dayton, 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
Size Limits
- –Maximum size of 750 sq ft
- –Maximum size of 50% of the primary residence’s floor area
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –0 spaces; off-street parking not required for ADU (ADU-specific standard eliminates the requirement). If provided, must meet 7.2.303; no new driveway unless corner lot (one driveway per street frontage); alley access allowed.
Rental Restrictions
- –Short-term rentals allowed only under City STR rules; owner-occupied STRs may rent up to 3 guest rooms (including rooms within the ADU) with City registration and transient lodging tax compliance, max occupancy 2 per bedroom + 2; non-owner-occupied STRs permitted only in zones that allow STRs (e.g., R-2, CR).
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.
Yamhill County