ADUs are allowed in MillvilleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Millville, UT
Is your property eligible for an ADU?
# of Properties
673
Owner-occupied
1%
Zoning districts
12
Avg Home Value
$580,522
Median Lot Size
0.40 acres
Avg Income
$113,033
Residential Types:
673 housing units
Land Residential
100%
Zoning Districts:
920 parcels · 12 districts
R-1
87%(799)
C-G
3%(32)
A
3%(29)
A10
3%(24)
Other
4%(36)
ADU Rules
What can you build in Millville, UT?
Millville, UT 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
Detached ADU Size Limits
- –Maximum size is the lesser of 1,200 sq ft or 50% of the primary residence’s total floor area.
Max Units
- –1 ADU per parcel (citywide)
Owner Occupancy
- –Owner must occupy either the ADU or the primary dwelling.
Parking
- –2 spaces/ADU on-site; citywide 2 spaces per dwelling unit. Exceptions: no parking in street ROW; displaced spaces must be replaced; surfaces must be hard (concrete/asphalt/gravel).
Rental Restrictions
- –Detached ADU: Short-term rentals prohibited (30 days or less); permit required before renting; unit cannot be rented without permit. Internal ADU: No ADU-specific STR ban; citywide limits apply: only one STR per property and a business license is required.
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 Utah municipalities
Rules change at the town line. Check the municipality your property is actually in.
Cache County