Measure the width of your door, as well as the width and height of the flat surface area at the bottom of the door. Don't just use the overall width of your door to determine the width of a kickplate, because that may give you an incorrect measurement. For instance, take note of any molding or decorative patterns on your door that affect the amount of room you have to install a kickplate.
Look for a kickplate that won't detract from the appearance of decorative patterns on a door by overlapping them. For example, leave about a 1/2-inch space between the top of a kickplate and the area where door panels, carvings or other decorative details appear on your door. Purchase a taller kickplate to dress up your door if it’s mostly a flat surface.
Choose a kickplate that's 1 to 2 inches shorter than the width of your door so it won't interfere with opening and closing the door. You could select a kickplate that's 34 to 35 inches wide if your door is 36 inches wide. Remember to center the kickplate so that both ends are 1/2- to 1-inch away from the sides of the door when you install it.