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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 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.

Yes, you can absolutely install an exterior door yourself, and installing a prehung exterior door requires few tools. However, exterior doors are heavy and bulky, and any mistakes during the installation process could have severe consequences, like a lack of security in your home, an increased risk of water getting in and causing damage, and an increased risk of pest infestation. It’s definitely possible to install an exterior door yourself, but it’s often a good idea to have a professional do it for you.