Johnson County, IA Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Johnson County, IA, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Permit-exempt shed size
- 200 sq. ft. or less, one story
- Setback from right-of-way
- 60 feet to qualify for reduced setback
- Reduced side/rear setback
- 5 feet (if 10 ft from house)
- Projection encroachment allowed
- Up to 2 feet into setback
- Governing code
- 2021 IBC/IRC as amended by county
- First-offense penalty
- Up to $750 civil infraction
Summary
Johnson County's amended building code exempts one-story detached tool sheds and playhouses up to 200 square feet from a building permit, but the shed still must clear the county's accessory-structure setbacks: 60 feet from the right-of-way and either 10 feet from the house or a reduced 5-foot side/rear line.
105.2/R105.2 Work Exempt from a Permit. A permit shall not be required for the following: Building: 1. One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area is not greater than two hundred (200) square feet. ... Exemption from the permit requirements of this Code shall not be deemed to grant authorization for any work to be done in a manner in violation of the provisions of this Code or any other laws or ordinances of this jurisdiction.
Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.
Full Breakdown
2 of the county's amended 2021 International Building and Residential Codes, a permit is not required for a one-story detached accessory structure used as a tool shed, storage shed, playhouse, or similar use, provided its floor area is 200 square feet or less. That size threshold is the dividing line: any shed larger than 200 square feet needs a building permit under Chapter 8:6 before construction. Skipping the permit never excuses a shed from zoning compliance. " Roof overhangs and similar projections may encroach up to 2 feet into that setback.
Storage buildings are also allowed to exceed the district's maximum number of stories, so long as they stay within the maximum height in feet for the zoning district. All of this applies only in the unincorporated county; Iowa City, Coralville, and North Liberty administer their own accessory-structure permitting under their municipal building codes.
Violations & Fines
Building a shed larger than 200 square feet without a permit, or placing any shed in violation of the setback rule, exposes the owner to a stop-work order and permit revocation from the Zoning Administrator under Chapter 8:8. A resulting County Infraction carries a civil penalty up to $750 for a first offense and up to $1,000 for a repeat offense, or the county may instead pursue a criminal citation with a fine up to $625 and up to 30 days in jail, with each day of the violation a separate offense.
Frequently Asked Questions
Do I need a permit to build a shed on my unincorporated Johnson County property?
How far does my shed have to be from the property line?
If my shed is permit-exempt, do the setback rules still apply?
Sources & Official References
Other rules in Johnson County
How Johnson County compares: Shed Permit Requirements by City·Compare Johnson County to another location·View the Iowa accessory structures overview
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