ADUs are allowed in Coos BayTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Coos Bay, OR
Is your property eligible for an ADU?
# of Properties
5,878
Owner-occupied
100%
Zoning districts
37
Avg Home Value
$306,198
Median Lot Size
0.17 acres
Avg Income
$71,095
Residential Types:
5,878 housing units
Apts (4+ units)
2%
Other
98%
Zoning Districts:
7,327 parcels · 37 districts
SLR
58%(4,217)
MDR
13%(948)
C
9%(631)
LDR
6%(439)
Other
15%(1,092)
ADU Rules
What can you build in Coos Bay, OR?
Coos Bay, 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 1,000 sq ft for attached or internal ADUs (full-floor conversions may exceed this).
- –Maximum size of 90% of the primary dwelling’s total floor area for attached or internal ADUs.
Detached ADU Size Limits
- –Maximum size of 1,000 square feet for a detached accessory dwelling unit
- –Maximum size of 90% of the primary dwelling’s total floor area
Parking
- –0 spaces; ADUs exempt from off-street parking citywide; detached-structure conversions allowed only if they do not eliminate an existing functional garage
Rental Restrictions
- –Short-term rentals prohibited; ADUs may be used only as long-term rentals (minimum 30 days per month) and not as vacation rentals or homestays.
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.
Coos County