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If you go DIY, here’s how to measure your entry door.
Measure the distance between the edge of one side of the door to the edge of the other side of the door.
Next, measure the distance between the top edge of the door to the bottom edge of the door. Don’t include any weatherproofing or sealing on the bottom of the door.
Measure the width of the frame, from edge to edge, across the existing door frame. Ignore any door trim.