Things You'll Need
Plastic expansion wall anchors
Mirror clips with screws
An over-the-door mirror typically is hung via two metal hooks on the back of the mirror frame. Hanging an over-the-door mirror flush to a wall requires removal of the hooks and simple installation. The force exerted on the fasteners is downward, so heavy-duty wall anchors are usually not necessary. Hanging the mirror on a wall does not require special tools or carpentry skills.
Turn the mirror face-down on a flat surface. Use a screwdriver to remove the screws that attach the door hooks to the frame of the mirror.
Hold the mirror on the wall where you want it to hang. Use a carpenter's level to adjust the position to make sure it is plumb and level. With the mirror in place, trace a faint line onto the wall, indicating the top, bottom and corners of the mirror. Take the mirror down.
Measure and mark the positions of the bottom mirror clips so they are the same distance from the lower corners of the mirror. Put the first lower clip in place on the wall so its supporting surface is aligned with the mark indicating the level of the bottom of the mirror.
Push the tip of an awl through the screw hole in the mirror clip and into the wall. Take out the awl and mark the position of the second lower mirror-clip screw hole. Use the tip of a pointed knife to ream the holes to fit the plastic wall anchors.
Push the wall anchors into the holes in the wall so their screw holes are flush with the wall. Align a mirror clip so its screw hole is over the hole in the wall anchor. Use a screwdriver and screw to attach the mirror clip to the wall. Repeat to install the second lower mirror clip.
Slide the mirror in place, supported by the two lower mirror clips. Place the upper mirror clips on the upper frame of the mirror so the spacing matches those on the bottom of the frame. Mark the positions of their screw holes on the wall with an awl. Take down the mirror and mirror clips.
Install the upper wall anchors using the same method used to install the lower anchors. Reposition the mirror on the wall, supported by the lower mirror clips. Align the screw holes in the upper mirror clips to the corresponding wall anchors and secure by screwing them into place.
Use winged or toggle-type wall anchors to securely hang a heavy mirror, such as one made with 1/4 inch-thick glass.
When you push the tip of the awl through the screw hole in the mirror clip into the wall and meet a wall stud, it is not necessary to use a wall anchor.