Tiny home rules in Mobile County, AL — 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 Mobile County turns on its foundation. On a foundation it is a dwelling needing a county building permit and, off sewer, an ADPH septic permit under r. 420-3-1; on wheels it is an RV.
A tiny house on a permanent foundation is a dwelling under Mobile County's adopted 2012 IRC, so Inspection Services permits and inspects it for egress, ceiling height, and alarms, and where the lot has no public sewer the Alabama Department of Public Health must issue an onsite sewage permit under Ala. Admin. Code r. 420-3-1. The county has no zoning to bar it. A tiny house on wheels is titled and registered as a recreational vehicle or travel trailer, not a permanent dwelling, and living in one full-time still depends on meeting the building and septic rules for a dwelling.
Placing a foundation tiny home without a building permit is illegal construction. Occupying any tiny home without an approved septic connection violates ADPH onsite sewage rules and can force disconnection.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Mobile County's tiny homes rules stack up against other locations.
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