Can I add an accessory dwelling unit to a Summerville house?

Adding an accessory dwelling unit to a Summerville house depends on the specific lot's zoning district, setbacks, and whether the property has capacity for a second septic connection or public sewer access. Newer Summerville subdivisions sometimes carry HOA restrictions that block a second structure even where the town's zoning would otherwise allow one. Brian Beatty can confirm both the zoning and any HOA restrictions on a specific Summerville lot before you plan a build.