ADU rules in Charleston, SC — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Charleston allows Accessory Dwelling Units (ADUs) in certain residential zones. ADUs must meet size, setback, and design standards. A permit is required and the property owner must reside on-site.
Charleston permits ADUs in certain residential zoning districts subject to standards in the Zoning Ordinance. ADUs may be attached to or detached from the principal dwelling. Size is typically limited to a percentage of the main dwelling or a maximum square footage (generally 800 sq ft). The property owner must reside in either the principal dwelling or the ADU. ADUs must comply with the same setback, height, and design standards as other accessory structures. A building permit and zoning approval are required.
Unpermitted ADUs face code enforcement action, fines, and potential orders to cease use as a dwelling.
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Side-by-side rule comparisons with other cities in Charleston County.
See how other cities in Charleston County handle adu rules.
See how Charleston's adu rules rules stack up against other locations.
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