Building Setbacks & Zoning in Johnson County, IA (2026)
3 county-level rules, plus city-specific rules for 1 city in Johnson County, Iowa.
Verified from official government sources
Setback Rules
Johnson County genuinely zones its unincorporated land under the Unified Development Ordinance. In the base Residential Single-Family (R) district, structures must sit 30 feet from the front line, 30 feet from the rear, and 8 feet from the side. Agricultural district setbacks run 40, 30, and 10 feet.
Johnson County Building Setback Requirements
Some RestrictionsJohnson County UDO 8:1.9(E)
Garages accessed via an alley must be setback a minimum of ten (10) feet from the right-of-way or easement line.
Structure Height Limits
Most homes in unincorporated Johnson County's residential and agricultural districts are capped at 35 feet and 2 1/2 stories under the zoning district bulk tables. Churches, hospitals, and schools may rise to 70 feet, and towers, chimneys, and similar features are exempt outright.
Johnson County Structure Height Limit Rules
Some RestrictionsJohnson County UDO §§ 8:1.6(D) & 8:1.25(A)(1),(2)
Single Family Dwellings ... Maximum Height 35 feet and 2 1/2 stories... A. Height Regulations. The height limits established in each zoning district can be exceeded in the following situations. 1. If a church, mosque, temple, other place of worship, hospital, institution, or school meets the required minimum setbacks in the district for which it is located, it may exceed the maximum height limi...
Lot Coverage Limits
Johnson County's Unified Development Ordinance defines lot coverage at Section 8:1.4(131) as the portion of a lot covered by all structures, and enforces it through a district-by-district accessory structure cap rather than a single countywide percentage. In the AR, A, SF, and every other unincorporated residential and commercial district, the equivalent Accessory Structure Regulations subsection caps accessory buildings at 30 percent of the yard they occupy.
Johnson County Maximum Lot Coverage Rule
Some RestrictionsJohnson County UDO 8:1.4(131), 8:1.7(E)(3), 8:1.24(E)(3)
131. Lot Coverage. The portion of a lot that is covered by all structures on the lot. ... 3. Accessory structures shall not occupy more than thirty (30) percent of the yard it occupies. ... The auxiliary dwelling unit shall meet the setback requirements of the primary dwelling unit and shall not cause the lot coverage requirement of the zone to be exceeded.
Building Setbacks & Zoning by City in Johnson County
1 cities in Johnson County have their own building setbacks & zoning rules. Each link goes to that city's dedicated page with code citations.
All Johnson County ordinances
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