ADU rules in Mobile County, AL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Mobile County has no zoning, so it cannot bar an accessory dwelling unit. But a detached living unit needs a county building permit and, off public sewer, an ADPH onsite sewage permit under Ala. Admin. Code r. 420-3-1.
There is no zoning in unincorporated Mobile County, so the county has no use rule that prohibits an accessory dwelling unit or requires a special approval. What controls instead is construction and sanitation: Inspection Services issues a building permit under the adopted 2012 IRC, and where no public sewer serves the lot, the Alabama Department of Public Health must issue an onsite sewage permit under Ala. Admin. Code r. 420-3-1 before the unit is occupied. Septic capacity is sized by bedroom count, at least 1,000 gallons. Private HOA deed restrictions, not the county, may still limit a second unit.
Occupying an accessory dwelling without an approved septic permit violates ADPH onsite sewage rules and can force disconnection. Building the unit without the county permit is illegal construction.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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