ADUs are allowed in FlorenceTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Florence, OR
Is your property eligible for an ADU?
# of Properties
4,221
Owner-occupied
65%
Zoning districts
43
Median Lot Size
0.19 acres
Avg Income
$59,639
Residential Types:
4,221 housing units
Medium Density Residential
100%
Zoning Districts:
6,482 parcels · 43 districts
R/MD
30%(1,960)
R/LD
21%(1,385)
R/HD
10%(671)
R/MH
6%(389)
Other
32%(2,077)
ADU Rules
What can you build in Florence, OR?
Florence, 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 internal ADU size: 1,000 sq ft.
- –Maximum internal ADU size as a percentage of the primary dwelling: 75% of primary floor area, or up to 100% if the primary living area is under 500 sq ft.
Detached ADU Size Limits
- –Detached ADU maximum size: no more than 1,000 sq ft
- –Detached ADU maximum size based on primary dwelling: up to 75% of primary living area, or up to 100% if the primary dwelling is under 500 sq ft
Max Units
- –LDR/MDR/RMH/Coast Village: 1 ADU per legal, buildable lot
- –HDR: up to 2 ADUs per lot (1 detached + 1 attached)
- –Other non-residential districts: 1 ADU per legal, buildable lot
Owner Occupancy
- –Owner-occupancy not required.
Parking
- –0 spaces required per ADU; parking must be shown on the site plan and maintained per FCC 10-3-4/10-3-8; 100 sq ft of ADU open space may not be used for parking.
Rental Restrictions
- –Short-term rentals prohibited
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.
Lane County