Step 1: Size The Door

measuring exterior front door to install a storm door
Photo: Ryan Benyi
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Measure the doorway's width at the top, middle, and bottom between the inside edges of the side casings, and its height at the center between the sill and the bottom edge of the head casing. The height and the shortest width will determine what size door you order. Specify which way the door should swing; its hinges should be on the same side of the opening as the entry door's.
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    Tools List

    • drill
      drill/driver
    • 1/8-inch drill bit
      -inch diameter drill bit
    • multi-bit screwdriver
      screwdriver

    Shopping List

    Screen door