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You can often fit a new door slab into an old frame as long as the frame’s in decent shape. The frame needs to be solid, square, and free of warping or rot. The new door has to match the old one in width, height, and thickness, and the hinge and knob placements need to line up or be adjusted carefully. However, if your frame is damaged, swapping just the door won’t cut it. In that case, replacing the entire unit would be the best move for a smooth, secure installation.

You put shims between the three-sided frame to which the door hinges are attached and the framing of the rough wall opening. Using shims like this will center your door in the wall opening and allows you to make small adjustments to get your door plumb and level for smooth operation. Your shims and the gap they fill will be covered when you install door trim, so don’t worry too much about the appearance.

Depending on the type of French doors you choose, they may be more expensive than sliding doors. Generally speaking, a single in-swing or out-swing French door will cost less than a sliding door, as it contains fewer materials and is easier to install. However, sliding doors usually have a slightly lower price tag, especially when compared to the standard double in-swing or double out-swing French doors.

You can install many types of interior doors without a frame as long as the door is prehung or there is already an existing door in the opening. If the opening has never had a door installed, you will need to install a frame with the door. Consult a professional door installer to inspect the opening to determine whether or not it’s possible to place a door there without a frame.