Tiny home rules in Sumner County, TN — 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.
A tiny home's status in Sumner County depends on its foundation. On a permanent foundation it is a dwelling under the 2021 residential code; as a second unit it must meet the ADU rules in Section 1101(R). On wheels, it needs a special exception.
Sumner County treats a foundation-built tiny house as a dwelling that must meet the 2021 ICC residential code adopted in 2023, with a building permit before work begins and TDEC verification of septic capacity. Whether it can sit as a second home on the lot is governed by the accessory dwelling unit rules in Zoning Resolution Section 1101(R): a detached ADU must be at least 300 square feet, cannot exceed the main house, needs 20,000 square feet of land on sewer or 40,000 on septic, and must be owner-occupied and not rented. A tiny home on wheels reads as an RV or mobile home, and an ADU involving a mobile home requires a Board of Zoning Appeals special exception.
Placing a foundation-built tiny home without a permit is unlawful construction. Living in an RV-style tiny home as a dwelling, or an ADU involving a mobile home without a special exception, is a zoning violation.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Sumner County, TN
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Sumner County, TN
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See how Sumner County's tiny homes rules stack up against other locations.
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