How to Measure for a New Entry Door: Step-by-Step
Get The Opening Size Right Before Ordering A lot of replacement door problems start with one bad assumption: that the old door size tells the whole story. It does not. The frame, jamb, threshold, and rough opening all matter, which is why the door slab alone is rarely the right number to use. Before you pull out a tape measure, take a minute to study how the door is built. A standard prehung unit is different from an older slab set into an existing frame, and a thresh