There is no single countywide cap, but Summerville leans on state law: selling more than once a quarter can count as business activity, which residential zoning bars. That effectively limits frequent sales in town.
Dorchester County itself does not publish a strict per-year garage-sale cap for unincorporated areas, where occasional personal-property sales are tolerated. Summerville, however, has pointed to South Carolina's treatment of sales held more than once per quarter as a business, and the town's zoning does not permit business activity in residential neighborhoods unless a nonprofit sponsors the event. In practice that makes roughly quarterly the safe ceiling inside town, not weekly or monthly. Neighborhood-wide or community sales are usually treated as a single event. Selling regularly can reclassify your home as an unlicensed retail operation.
Sales frequent enough to be deemed a business invite zoning enforcement and business-license penalties. Each ongoing sale day can be treated as a separate violation.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Summerville's frequency limits rules stack up against other locations.
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