An interior door is any door that does not provide access to the outside of a home or building, like a closet door, bedroom door, bathroom door, or office door.
Standard interior doors are simply one-piece doors that fit an opening and are mounted on hinges to one side of the opening. They swing out or into a room, depending on installation, and can accommodate a doorknob, which can be locked from inside the room. Some of these doors are solid wood, but many are hollow. They can be stained or primed and painted. A six-panel door is also a standard type of interior door, but with recessed panels added as a design element.
Another type of interior door is the bi-fold door. Bi-fold doors are used for closets and between two frequently used rooms. Bi-fold doors are two doors hinged together that fold into one another. They are mounted on a track that hangs from the head, or top, of the opening. An opening can hold one single bi-fold door or two doors that meet in the middle. They are a popular choice because when they are opened, there is less intrusion into the room than standard doors. The design of bi-fold doors can be solid, louvered, or a combination of both. There are also six-paneled bi-fold doors for added design. Bi-fold doors are generally not used for areas requiring privacy, such as bathrooms.
Luan doors are also doors that are mounted from a track at the head of the opening. The opening houses two doors that slide, one behind the other. Luan doors are commonly used as closet doors and they take up no additional space in the room when opened. However, their design prohibits both sides of the closet being accessible simultaneously, thus reducing the opening by half once installed.
Pocket doors are interior doors that slide away from the opening and into the wall. They are very popular, especially in new construction, because they allow an opening to be fully accessible while not requiring any space. They can be locked, and thus work for any room. However, replacing interior doors with pocket doors is far more extensive than any other type or replacement. There must be a non-load bearing wall wide enough to house the door next to the opening and the existing framing must be torn out and replaced with framing that will accommodate the pocket door.
