ADUs are allowed in Sioux CityTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Sioux City, IA
Is your property eligible for an ADU?
# of Properties
28,107
Owner-occupied
83%
Zoning districts
25
Avg Home Value
$199,903
Median Lot Size
0.17 acres
Avg Income
$76,073
Residential Types:
28,107 housing units
2-3 Family
2%
Apts (4+ units)
2%
Other
96%
Zoning Districts:
32,524 parcels · 25 districts
NC.4
59%(19,109)
NC.2
15%(4,973)
NC.3
6%(2,047)
GC
4%(1,351)
Other
16%(5,044)
ADU Rules
What can you build in Sioux City, IA?
Sioux City, 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 size of 25% of the principal building's gross floor area
Detached ADU Size Limits
- –Maximum detached ADU size of 600 sq ft in SR, UR, MU, and NC districts; no maximum applies in the Agriculture (AG) district.
Max Units
- –Single-family detached: 1 ADU per lot; Duplex and multifamily: 0 ADUs.
Owner Occupancy
- –Owner occupancy not required.
Parking
- –Additional parking required if the lot includes an ADU; tandem parking allowed (max 1 tandem space per lot); garage-conversion requires replacement off-street parking (1 space for converting a 1-car garage; 2 spaces for a 2+-car garage); SR/GR/UR districts: no parking in front or corner side yards except on a driveway with a maximum width of 14 feet; NC subdistricts: integrated ADUs must show adequate on-site parking or room to add it without encroaching required yards.
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