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.

You can use any wood to make an interior door, provided it’s the right thickness. Common options for painted doors include pine or poplar for the stiles, rails, and mullions, and paint-grade plywood for the panels. You can also opt to make your own panels out of pine or poplar if you intend on staining the door instead. Opting for oak, maple, or another hardwood is another great option for a high-end door that will last for decades, but the wood will cost significantly more.

Check the package of your bifold door. The width shown is half an inch larger than the bifold set. This allows at least 1/4 inch between the side jamb and pivot. When installing the top track, saw the track down to leave approximately 1/6 inch on each end. This will ensure your bifold door folds and unfolds smoothly without getting stuck in the frame.

Kick plates can absolutely be installed on metal doors. Many kick plates for metal doors are magnetic to avoid needing to drill into the metal, but many door manufacturers make kick plates that can be traditionally installed on metal doors using screws. Consult the manufacturer’s instructions to see which is recommended for your door model.