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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.

You can use wood, metal, or plastic as a door shim, but keep in mind that wood will rot easier than the other two materials. Your local hardware store should have at least one type in stock. Alternatively, you can trim a piece of cardboard to fit underneath your door hinge and work as a temporary, makeshift door shim.

A prehung door is a door that comes ready to install, already mounted in its frame with hinges and stop molding included. Because everything is factory-aligned, installation is quicker, more precise, and convenient, as you don't need to drill or align the hinges yourself. This makes it a smart option if your current frame is damaged, uneven, or if you're working on a new build. Installation involves fitting the entire unit into the rough opening, shimming and leveling it, and then securing it. If you are replacing an existing prehung door, the process is even simpler, often just requiring you to swap the old unit for the new one and secure it with a few screws. Prehung doors typically cost only slightly more (around $20) than a door slab alone, making them an efficient choice.

Bifold doors are a practical and space-saving option for closets, especially if you're figuring out how to design a closet in smaller rooms. This door style allows full access to the closet opening while taking up less floor space than traditional swing doors. Bifold doors come in a variety of styles, materials, and finishes to match any decor.