Accessory Structures in Linn County, IA (2026)
2 county-level rules, plus city-specific rules for 1 city in Linn County, Iowa.
Verified from official government sources
ADU Rules
Linn County allows one accessory dwelling unit per parcel with an existing single-family home, capped at 1,200 square feet or half the main house's size, whichever is larger.
Linn County ADU size limit
Some RestrictionsLinn County Code § 107-113(e)
(e)Household living, accessory dwelling unit. All accessory dwelling units shall meet the following standards: (1)Minor site plan required. A minor site plan shall be submitted and reviewed prior to the approval of an accessory dwelling unit. (2)One allowed per parcel. Only one accessory dwelling unit shall be allowed per parcel and only when there is an existing single-family detached dwelli...
Shed & Carport Rules
Unincorporated Linn County caps detached sheds and other accessory structures at 25 feet tall in most residential districts, with a 10-foot side setback that can shrink to 3 feet behind the house.
Linn County Shed Setback & Height Rules
Some RestrictionsLinn County Code § 107-94(c)(2)b, (c)(2)d
Maintain ten feet to any side lot line when the accessory structure is located beside the principal structure; when located behind the principal structure the setback may be reduced to no less than three feet from any side or rear lot line with any overhang not closer than one foot from the lot line. c.Allowance for detached accessory structure in front of principal structure. For detached acc...
Accessory Structures by City in Linn County
1 cities in Linn County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
All Linn County ordinances
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