Tiny home rules in Johnson County, IA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
How Johnson County treats a tiny home depends on its foundation. Built on a permanent foundation it is a dwelling under the building code; on wheels it is generally an RV or manufactured home.
A foundation-built tiny home in Johnson County is treated as a regular dwelling and must meet the 2024 International Residential Code, including Appendix AQ, which sets standards for houses of 400 square feet or less. A tiny home on wheels is usually classified as a recreational vehicle or manufactured home and faces zoning limits on where it can sit and for how long. Iowa's 2025 ADU law offers a path to a foundation-built tiny home as a second unit on a single-family lot, capped at 1,000 square feet or 50 percent of the main house. Utility, sewer or septic, and footing rules apply.
Placing or occupying a tiny home without the required permits or in the wrong zoning district can bring fines, a relocation order, or a bar on occupancy until it meets code.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Johnson County's tiny homes rules stack up against other locations.
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