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A door sill is the horizontal part of the door frame at the bottom, while a door jamb consists of the vertical parts of the frame on either side. The door sill serves as a threshold, sealing the bottom of the door, while the door jamb provides structural support and houses the hinges and latch. Both are essential components of a door frame, with the door sill acting as a transition point and the door jamb providing stability and functionality.

You want plenty of room between your pre-hung door and the framing in your wall to allow for shimming to get the door into the perfect position, so aim for about 1 inch on the top and both sides. That means you should make your rough opening about 1 inch taller and 2 inches wider than your pre-hung door. You’ll then use shims to stabilize and level the door before installing it.

To build a standard size, six-panel door yourself, you’ll need four 2-foot by 6-foot boards, one 2-foot by 8-foot or 2-foot by 10-foot board, and a sheet of 3/4-inch, paint-grade plywood. The 2-foot by 6-foot boards will serve as your stiles, top rail, and horizontal and vertical mullions, and the wider board will serve as the bottom rail, which is usually wider than the other horizontal pieces. The plywood will serve as the panels, but you’ll need around five 1-foot by 6-foot boards to make your own panels if you want to stain the door rather than paint it.

It’s possible to install a door yourself if the wall opening already exists, but the work is rather complicated, and a professional installation is usually well worth the investment. For your door to work and close properly, you’ll need to shim and level the door frame in your wall perfectly, which can be difficult. Additionally, we recommend you always hire a professional door installer to place an exterior door, as mistakes during the installation process can lead to poor security for your home.