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A slab door is a standalone door without a frame or hardware. A prehung door is a complete set that includes the door, frame, hinges, and sometimes the doorknob and lockset.

In most cases, a prehung door is the better and easier option to install, especially for DIY projects or exterior applications, as they often come pre-weatherproofed. They require fewer tools and less experience to install properly. Although prehung doors are heavier and have a higher upfront cost, the investment is often worthwhile for a complete upgrade that includes a new frame.

A slab door may be a better choice if you are on a tight budget, have a custom-sized wall opening, or only need to replace the door while keeping the existing frame. While the initial cost is lower, you will need to purchase all the hardware separately and do more DIY work to hang it, which may not result in significant time or money savings.

Most modern door knobs will all fit in standard, modern doors, so if you know your door was made in the last 50 years or so, you should be fine buying a standard replacement door knob. The only exception would be a thumb latch handleset for an exterior door, as this type of door knob may not fit your door without drilling a mounting hole for the bottom of the handle. Antique or custom doors might also have different sizes and knob mounting holes, so call in a professional if you don’t believe your door is a standard one.

You can convert a pre-hung door into a Dutch door, but it’s more of a pain. Pre-hung doors are already set in the frame with the hinges and everything aligned, so once you cut the slab in half, you’ll likely need to adjust the hinge placement and maybe even mess with the frame itself. It’s doable, but expect some trial and error because it’s not a straight-swap situation.

A butterfly hinge—also known as a surface mount hinge or dovetail hinge—is exactly what it sounds like: a hinge that resembles a butterfly. This type of decorative hinge, which is mounted on the surface of a door or cabinet, consists of two panels. One panel is mounted on a stable surface like a door frame and the other is mounted on the surface you need to open. It hinges open and closed like the wings of a butterfly.