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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.

A door frame is typically 2 to 2.5 inches wider than the door. This additional space accommodates the door jamb and hinges and allows for necessary installation adjustments. For example, if the door is 30 inches wide, the rough opening should be 32 to 32.5 inches wide to ensure a proper fit and smooth operation.

A door sill is the bottom portion of your door frame, while a threshold is the transition piece that separates the two types of flooring between rooms, or serves as the transition between the interior and exterior on an exterior door. The threshold sits on top of the door sill. A kick plate is a protective plate that sits against the face of a door to prevent damage to the door from feet and shoes. You’ll usually only find kick plates on exterior doors, while every door has a door sill, and most exterior and interior doors have a threshold.