Exterior doors. Exterior prehung doors are assembled to be weathertight at the factory. This spares you the duty of figuring out how to weatherproof your doorway and cut out drafts.
New construction. Prehung doors—both interior doors and exterior doors—come in handy during new construction projects when a builder can create a structure around the size and configuration of a prehung door. They are particularly useful when a builder has to install a great number of doors, like in a multi-unit apartment building.
Damaged door openings. Prehung doors are great for door openings that are damaged or rough that would otherwise be difficult to build a frame in. This situation might come up when remodeling or refurbishing an older home
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