ADUs are allowed in MarshalltownTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Marshalltown, IA
Is your property eligible for an ADU?
# of Properties
10,496
Owner-occupied
71%
Zoning districts
15
Median Lot Size
0.23 acres
Avg Income
$69,522
Residential Types:
10,496 housing units
Apts (4+ units)
2%
Other
98%
Zoning Districts:
11,114 parcels · 15 districts
RM
57%(6,370)
RL
22%(2,394)
GI
5%(534)
MU
4%(429)
Other
12%(1,387)
ADU Rules
What can you build in Marshalltown, IA?
Marshalltown, IA 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 is the larger of 1,000 sq ft or 50% of the single-family home’s floor area.
Detached ADU Size Limits
- –Maximum detached accessory dwelling unit size is 1,000 sq ft or 50% of the single-family residence floor area, whichever is larger.
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –0 spaces/ADU; no maximum; primary dwelling must meet its own parking; ADUs have no minimum or maximum
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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Learn the key rules and size limits for ADUs