ADUs are allowed in GladstoneTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Gladstone, OR
Is your property eligible for an ADU?
# of Properties
3,624
Owner-occupied
73%
Zoning districts
12
Avg Home Value
$637,701
Median Lot Size
0.17 acres
Avg Income
$97,312
Residential Types:
3,624 housing units
Single Family
93%
2-3 Family
1%
Apts (4+ units)
1%
Other
5%
Zoning Districts:
3,730 parcels · 12 districts
R7.2
57%(2,121)
R5
31%(1,150)
C2
4%(153)
C3
4%(132)
Other
5%(174)
ADU Rules
What can you build in Gladstone, OR?
Gladstone, 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; basement conversions with no new floor area are exempt
Detached ADU Size Limits
- –Maximum size of 800 sq ft
Max Units
- –R-7.2 & R-5: 1 ADU/lot; MR: none specified.
Owner Occupancy
- –Owner-occupancy required for vacation rental ADUs; recorded deed restriction.
Parking
- –0 spaces/ADU; 1 if vacation rental. Waived in Town Center, within 1/4 mi of it, or 1/2 mi of McLoughlin Blvd (high-frequency transit).
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.
Clackamas County