Accessory Structures in Sioux City, IA (2026)
3 verified accessory structures rules for Sioux City, Iowa, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Sioux City allows two types of accessory dwelling units, but only on single-family lots of at least 7,000 square feet in listed zoning districts, per Municipal Code § 25.02.260.
Sioux City Accessory Dwelling Unit Zoning
Some RestrictionsSioux City Municipal Code § 25.02.260
Accessory dwelling units (ADUs) are permitted only according to the standards of this Section. 2. Accessory Dwelling Unit Types. For the purposes of this Code, there are two types of ADUs permitted in the City (See Figure 25.02.260, Illustrative ADU Types): a. Integrated Units are those units that are created within or attached to an existing principal building such that they appear to be a f...
Shed & Carport Rules
A Sioux City carport or porte-cochere needs a building permit and tops out at one story or 16 feet; in Neighborhood Conservation sub-districts its posts must sit at least 4 feet from a side line and 10 feet from front, street-side, or rear lines.
Sioux City Carport Setback & Permit Rules
Some RestrictionsSioux City Municipal Code § 25.03.080.1
4. Height. Carports and porte-cocheres shall not exceed one story or 16 feet in height, whichever is less. ... In the NC Sub-Districts, support posts shall not be closer than: Four feet to any interior side property line; Ten feet from a rear property line; and Ten feet from a front or street side property line. ... 7. Building Permit. A building permit is required for the construction of carpo...
Garage Conversions
Sioux City bars converting a garage into an accessory dwelling unit unless the lost parking is replaced elsewhere on the lot, per Municipal Code § 25.02.260, Item 4.
Sioux City Garage-to-ADU Conversion Rules
Some RestrictionsSioux City Municipal Code § 25.02.260
4. Conversion of Garages. Garages shall not be converted into accessory dwelling units, unless: a. If a one car garage is converted, at least one replacement parking space is provided elsewhere on the lot; or b. If a two or more car garage is converted, at least two replacement parking spaces are provided elsewhere on the lot.