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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.

Spacing a door is tricky since you need to leave enough of a gap for the door to move freely and not get stuck when the slab and frame contract and expand in dry and humid conditions. The ideal gap between a doorframe and slab is 1/8 of an inch. If the gap is any larger, the door will feel drafty. But if the gap is any smaller, the slab can get stuck due to weather changes.

Instead of a bifold door, you might look into installing French doors, pocket doors, or sliding doors. Each has its own pros and cons. French doors offer the dual-door advantages that bifold doors do, and pocket doors are excellent space savers—though you’ll need to create a wall cavity to have them installed. 

You will need to cut or break a boomstick so it is wider than the door and long enough to anchor outside the door frame. Extend the broomstick horizontally under the doorknob, ensuring it's snug. Now using long screws and a drill, anchor the broomstick to the wall outside the door frame. Remember that you won't be able to open the door afterward. Do not proceed with this hack if your home has no alternative exit.