DIY Door Threshold


The threshold is the wood piece under the door in your doorway opening. The threshold connects directly to your subfloor. Wooden thresholds will begin to rot and break over time. Depending upon the age of your home, the threshold may not fit under the door jamb casing. Replace the door threshold yourself in a single afternoon. Thresholds are available at home improvement centers and you can stain or paint them to match your home.

Things You'll Need

  • Tape measure
  • Reciprocating saw
  • Bi-metal saw blade
  • Pry bar
  • Hammer
  • Circular saw
  • Hand saw
  • Square
  • Wood screws
  • Screwdriver
  • Silicone caulk
  • Caulking gun
  • Wood block
  • Measure the thickness and depth of the old threshold with a tape measure. The depth is the distance between the front of the threshold and the back of the threshold. Measure the distance between the door jamb with the tape measure. Your new threshold must be a few inches longer than the width of the door opening and the same thickness and depth of the current threshold.

  • Remove the old threshold from the doorway. Place a wood cutting blade into your reciprocating saw and cut through the center of the old threshold and 4 inches from each jamb. Pry the old threshold out of the doorway with a small pry bar and hammer. Take care not to damage the bottom of the door jamb when removing the threshold. Take the wood cutting blade out of the reciprocating saw and insert a bi-metal blade. Cut through the nails securing the toe kick to the home. The toe kick is the flat piece below the threshold on the outside of the door way. Pry the toe kick away carefully and remove or drive in the nails.

  • Measure the distance between the outside of the bottom jambs and transfer the measurement to the new threshold. Cut the threshold to the measurement with a circular saw or hand saw. Measure the width of the right-side jamb casing and transfer the measurement to the back right-side of the new threshold. Measure the depth of the right-side casing from front to back and transfer that measurement to the back right-side of the threshold. Draw a straight line from each mark with a square and cut the notch out of the threshold. Do the same procedure for the back left side of the threshold, using measurements from the left-side jamb casing.

  • Test-fit the new threshold into the doorway. Test-fit the old toe kick under the new threshold to determine if you need to make adjustments to the toe kick height. The threshold should be slightly lower on the outside edge to allow water to flow down instead of catching water. Temporarily secure the toe kick with wood screws and a screwdriver and pull the threshold away from the doorway.

  • Tighten the wood screws securely to fasten the toe kick to the home. Place silicone caulk at the points on the subfloor where the threshold will meet the subfloor, using a caulking gun. Slide the threshold into place, using a block of wood and hammer to aid around the door jambs. Secure the threshold to the subfloor with wood screws and a screwdriver.

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