The standard Shaker door is 1 3/8 inches thick, featuring a 1/4-inch recessed center panel with 3 1/4-inch stiles and rails. This traditional construction keeps the door lightweight yet strong, maintaining that signature Shaker simplicity. For taller or wider doors, builders may increase overall thickness to 1 3/4 inches to ensure durability and prevent warping. Custom doors can adjust panel depth and frame width based on architectural style or soundproofing needs.