What is an accessory dwelling unit and where might one fit on a Summerville or Sullivan's Island lot?

An accessory dwelling unit, or ADU, is a smaller second home with its own kitchen, bathroom, and entrance, distinct from a finished basement or bonus room, built on the same lot as a primary house. On a Summerville lot, a detached unit in the backyard often fits more easily given typically larger suburban lots, while a Sullivan's Island lot usually has tighter setbacks and flood elevation rules that limit placement. Brian Beatty can walk through what's realistic on a specific lot in either town before you plan one.