Shaker door panel thickness can usually be customized depending on the door construction, panel material, and project requirements. In most residential interior doors, the two most common panel thickness options are 8 mm and 12 mm. An 8 mm panel is typically used for standard 80-inch doors with 35 mm thickness, offering a balance between cost and performance. A 12 mm panel is commonly used for 96-inch doors or doors with 45 mm thickness, providing improved durability and deeper visual definition. Panel thickness is usually determined by factors such as door height, overall door thickness, structural stability, material type, and project budget.