Founded in 2021 and based out of Shelton, CT, Avanti specializes in rain gutters and guard solutions. Avanti LLC is an owner-operated family partnership offering customized aluminum gutter solutions tailored to each home's unique layout and design…Founded in 2021 and based out of Shelton, CT, Avanti specializes in rain gutters and guard solutions. Avanti LLC is an owner-operated family partnership offering customized aluminum gutter solutions tailored to each home's unique layout and design needs.