ADU rules in Mobile, AL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Mobile allows one ADU per single-family lot under the unified development code. Size is generally limited to 1,000–1,200 square feet or a percentage of the primary dwelling. ADUs must meet building code standards.
Mobile's unified development code allows one accessory dwelling unit per single-family lot. ADU size is typically limited to 1,000–1,200 square feet or a percentage of the primary residence, whichever is less. ADUs must comply with building code for residential occupancy including plumbing, electrical, egress, and fire safety. Setback requirements apply. A building permit is required. Alabama does not have statewide ADU legislation, so Mobile's local code governs.
ADUs built without permits or exceeding size limits face code enforcement action.
Mobile, AL
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Mobile, AL
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See how Mobile's adu rules rules stack up against other locations.
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