Step 2: Mark the new door for trimming

marking the new door for trimming
Photo: Brian Wilder
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Remove the lockset (doorknob) and hinges from the old door. If reusing the lockset, note how it goes together.

Lay the new door across a pair of sawhorses and set the old door on top, aligning the top end and the lockset edge of the old door perfectly flush with the new door.

Trace around the old door with a pencil to indicate where the new door must be trimmed down to size.

Tip: Correct clearance for an installed interior door is 1/8 inch on the sides and top (to jamb) and 5/8 inch at the bottom (to flooring/carpet).

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    Tools List

    • hand plane
      Hand plane
    • ratcheting screwdriver
      Screwdriver
    • straightedge guide
      Straightedge guide for circular saw
    • combination square
      Combination square
    • circular saw
      Circular saw
    • Phillips screwdriver
      Drill/driver with extra-long Phillips tip
    • keyhole saw
      2 1/8-inch hole saw
    • spade bit
      7/8-inch spade bit
    • self-centering bit
      Centering bit
    • 16-foot tape measure
      Tape measure
    • hammer
      Hammer
    • chisel
      3/4- and 1-inch-wide chisels
    • utility knife
      Utility knife

    Shopping List

    1. INTERIOR DOOR

    2. PRIMER AND PAINT, OR STAIN AND VARNISH