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No, exterior doors don’t need to be prehung, although choosing a door that is prehung makes the installation process far easier. Installing an exterior door that isn’t prehung requires carefully maneuvering the heavy door into place in your door frame, making sure it’s level and plumb on all sides, and then attaching the hinges so that they’re perfectly level and are affixed to the right part of your frame and door. Prehung exterior doors are far more DIY-friendly.

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.

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.

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.