How to Measure for a Replacement Door Without Mistakes
Begin With The Rough Opening, Not Just The Slab It is tempting to measure the existing door and call it good, but that is where a lot of replacement jobs go sideways. A replacement door has to work with the opening, the frame, and the threshold, not just the visible slab. If you are replacing a prehung exterior door, you are usually measuring for the rough opening and the complete frame assembly. Before you write anything down, check whether the door opens inwar