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French doors that open to exterior spaces are often installed to swing inward, as this makes them more secure than outward-swinging doors, due to the interior hinges being inaccessible from the outside. For interior doors, it’s personal preference which direction to hang your doors, but it’s common to have them open into the larger of the two spaces they’re separating.

Standard door sizes aren’t one-size-fits-all, but there are common go-to dimensions. For exterior doors—like your front door—36 inches wide by 80 inches tall is typical, though you’ll see 30- or 32-inch widths too, especially in older homes. Interior doors vary more. Bedrooms and bathrooms often use 30- to 32-inch widths, and closet doors can be anything from slim singles to wide bi-folds. Height is usually 80 inches across the board; however, always measure your actual opening. “Standard” only works if it matches what’s already in place.

French doors can either open inward or outward, but because hinges are the mechanism for opening and closing, a single set of French doors will not be able to do both. Most French doors only open outward onto a patio, deck, or porch, while some only open inward if the outdoor space is limited and can’t accommodate the open doors.

You can install many types of interior doors without a frame as long as the door is prehung or there is already an existing door in the opening. If the opening has never had a door installed, you will need to install a frame with the door. Consult a professional door installer to inspect the opening to determine whether or not it’s possible to place a door there without a frame.