ADUs are allowed in Unincorporated MissoulaTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Missoula, MT
Is your property eligible for an ADU?
# of Properties
465
Owner-occupied
22%
Zoning districts
7
Avg Home Value
$686,731
Median Lot Size
0.11 acres
Avg Income
$86,934
Residential Types:
465 housing units
Single Family
28%
Apts (4+ units)
6%
Condos
41%
Other
25%
Zoning Districts:
13 parcels · 7 districts
I-1
46%(6)
U-MU1
15%(2)
LU-R1
8%(1)
U-R1
8%(1)
Other
23%(3)
ADU Rules
What can you build in Unincorporated Missoula, MT?
Unincorporated Missoula, MT 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 is the lesser of 980 sq ft or the gross floor area of the principal structure.
Detached ADU Size Limits
- –Maximum size of 980 sq ft and no more than the gross floor area of the principal structure.
Max Units
- –1 ADU per lot for single-family and duplex (attached or detached)
Parking
- –Off-street parking not required for ADUs; no other ADU-specific parking provisions.
Rental Restrictions
- –Short-term rentals allowed only as tourist homes with per-parcel caps (1 per parcel in AGR/AGW/AGRR/RRS/R/LM; 2 per parcel in RM/NR/NC); licensing/occupancy requirements apply; no explicit long-term rental limits stated.
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 Montana municipalities
Rules change at the town line. Check the municipality your property is actually in.
Missoula County