Iron County, UT Building Setbacks & Zoning: Structure Height Limits (2026)

Iron County Code § 17.16.040, the Table of Site Development Standards that accompanies the Table of Uses in Section 17.16.030, sets the maximum and minimum building height for every zoning district in unincorporated Iron County. Residential lots zoned R-5, R-2, R-1, R-1/2 and R4K are capped at 30 feet or two stories, with a one-story minimum, so a legally built home cannot rise past two full stories regardless of lot size. The C (commercial) and LI (light industrial) zones allow three stories with the same one-story floor.

The A-20, RA-20 and RR-20 agricultural zones, along with the I and I-A industrial zones, are marked "NR" (not regulated) for height in the table, meaning the county has not set a numeric ceiling there. Section 17.36.100 layers on top of the table: roof structures such as elevators, stairways, tanks, ventilating fans, parapet walls, skylights, towers, steeples, flagpoles, chimneys, smokestacks, water tanks, wireless or television masts and similar equipment may rise above the district height limit, but no usable floor space may be created in that extra height.

Public buildings can also exceed the district maximum if the planning commission grants a conditional use permit under the procedures in Title 17. Anyone proposing a residential structure taller than the district limit, including a legally created nonconforming lot governed by the substitution table in Note (11), must apply through Iron County Planning and Zoning/Building before a building permit is issued; the county's land use authority reviews plans against the table before construction begins. Owners inside a "Performance Subdivision Option" in the R-1/2 zone follow the substitute height standards recorded in Section 16.23.040 instead of the table's default figures.