How to Remove and Replace an Entry Door

Measuring door casing on old entry door.
Measuring door casing on old entry door.

How to Measure for an Entry Door

To determine the size for a new entry door, measure the existing door unit:

  1. Measure the width and height of the existing door.
  2. Measure the width of the door jamb between the interior and exterior door casings to determine the thickness of the wall. Door jambs are the sides of the door frame that are perpendicular to the door and cover the wall studs. On a standard 3½” stud wall, the door jamb usually measures 4 5/8” wide to allow for 1/2″ drywall on the inside and 1/2″ plywood sheathing on the outside.
  3. Measure the outside dimensions of the door casings around the door frame. Door casings are the top and side pieces of the door frame on the inside and outside that attach to the wall studs and door jambs to hold the door in place. Most exterior doors have 2” wide by 1¼” thick brick mold for the exterior casing around the door, and 2¼” to 3¼” wide by 11/16” thick molded trim casing on the interior.
  4. Take the measurements to your building supply or home center and match the size of the door, thickness of the jamb, and exterior dimensions of the casing to the existing door on your house. The interior dimensions of the casing are not as crucial, since the casing overlaps onto the wall.


  1. We have a older home 1937 with a wooden entry round top door. Need to replace it, would like to do so with a square one, what are our options?

  2. Ramona,
    I’ve done a lot of research and I would recommend a fiberglass door that is made to look like wood. This way it would continue with the look of your home but provide better insulation for hot or cool weather.

  3. Need to replace door sweep. door pins are spring loaded. found vidos to remove pin. Whats next, its a knuckle buster after the pins come out. found no futher info. Jeff.

  4. I think I may need look more into refinishing and refurnishing. Though my door does have some issues, like wood deterioration, but I don’t think it’s that big of a deal. I think I’m just in the mood for change.

  5. Thanks for letting me know that wood beginning to rot is a sign you need to replace the door. My door has begun to have this issue, and I want our home to remain secure. Maybe it would be best to replace the door as soon as possible.

  6. My exterior door doesn’t have any damage but the frame and jamb or threshold(the bottom) are loose, can just those be replaced or do I have to buy the door and frame set?

    • Hi, Susan,
      You shouldn’t need to buy a new door and frame set. Repairing a loose door frame and jamb could be a DIY job, or you could “hire it done.”
      It just depends on the damage involved.
      We recommend getting a professional to look at the situation and offer a quote based on his or her inspection.
      Good luck!


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