Overview

Existing Jamb illustration
Illustration: Gregory Nemec
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Before you begin, measure the width and height of the old door (the thickness of all but the oldest interior passage doors is standardized at 1 inches). Bring these dimensions with you when you buy the new door "blank"—unlike a "prehung" door, it won't be surrounded by a jamb or drilled out for the lockset. Doors come in just a few heights—80 inches is the standard—but a wide range of standard widths.

CAUTION: Door manufacturers use shorthand to describe a door's width. So a 3-0 (pronounced "three-oh") door is 3 feet, 0 inches, or 36 inches, wide—not 30 inches.
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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