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A door sill is the bottom portion of your door frame, while a threshold is the transition piece that separates the two types of flooring between rooms, or serves as the transition between the interior and exterior on an exterior door. The threshold sits on top of the door sill. A kick plate is a protective plate that sits against the face of a door to prevent damage to the door from feet and shoes. You’ll usually only find kick plates on exterior doors, while every door has a door sill, and most exterior and interior doors have a threshold.

Permits are required when carrying out any structural work, so in most cases, you will need a building permit to cut through a concrete block wall to install a door. If you have specific questions about your project or need to obtain a permit, contact your municipal building department or ask your contractor for advice.

Many doorways feature two door jambs. These are installed on both sides of a doorway to prevent the door from swinging too far. Door jambs usually stop the door at 180 degrees when closed.  A doorway floor transition sits between the door jambs on the floor, helping to create a safer and more aesthetically pleasing transition from one flooring type to the next. 

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.