Building Setbacks & Zoning in Black Hawk County, IA (2026)
3 rules for unincorporated Black Hawk County, Iowa.
Verified from official government sources
Setback Rules
In the residential zoning districts of unincorporated Black Hawk County, Iowa, the required front yard is set by the district's base standard, but where at least 30 percent of nearby lots already sit back further, the front setback becomes the average of those built setbacks and the district minimum. BHCC § 18.70.120 caps that computed setback at 50 feet.
Black Hawk County Front Yard Setback Formula
Some RestrictionsBlack Hawk County Code § 18.70.120
In any “R” district there shall be a minimum front yard required as stated in the yard requirements for that particular district; provided, however, that where lots comprising 30 percent or more of the frontage within 200 feet of either side lot line are developed with buildings at a greater setback, the front yard setback shall be the average of these building setbacks and the minimum setbacks...
Structure Height Limits
Unincorporated Black Hawk County, Iowa lets public, semi-public and institutional buildings rise to 60 feet, and churches and temples to 75 feet, if they add extra side and rear setback for every foot of height above the district limit. Single-family and two-family homes can add up to 10 feet of height in exchange for 10 extra feet of side and rear yard, but never exceed three stories.
Black Hawk County Building Height Exceptions
Some RestrictionsBlack Hawk County Code § 18.120.010(A), (B)
A. Public, semi-public or public service buildings, hospitals, institutions, or schools, when permitted in a district, may be erected to a height not exceeding 60 feet and churches and temples may be erected to a height not exceeding 75 feet if the building is set back from side and rear yard lines heretofore established an additional foot for each two feet of building height above the height l...
Lot Coverage Limits
In unincorporated Black Hawk County, Iowa, an accessory building placed in a required rear yard cannot occupy more than 30 percent of that rear yard. BHCC § 18.120.010(D) sets the cap; a companion provision in the same zoning title also limits detached accessory buildings to 20 feet in height when they sit apart from the main house.
Black Hawk County Rear Yard Accessory Building Cap
Some RestrictionsBlack Hawk County Code § 18.120.010(D)
D. Accessory buildings may be built in a required rear yard, but shall not occupy more than 30 percent of the rear yard.
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