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A prehung door is a door that comes ready to install, already mounted in its frame with hinges and stop molding included. Because everything is factory-aligned, installation is quicker, more precise, and convenient, as you don't need to drill or align the hinges yourself. This makes it a smart option if your current frame is damaged, uneven, or if you're working on a new build. Installation involves fitting the entire unit into the rough opening, shimming and leveling it, and then securing it. If you are replacing an existing prehung door, the process is even simpler, often just requiring you to swap the old unit for the new one and secure it with a few screws. Prehung doors typically cost only slightly more (around $20) than a door slab alone, making them an efficient choice.

Generally, hinged French patio doors are considered more secure than sliding glass doors. French doors typically feature a more robust, solid frame that can support multi-point locking systems and deadbolts, securing the door at several points and making them harder to break into. In contrast, sliding doors often rely on a single lock and operate on tracks, which can be a security vulnerability. While you can add security bars and other features to enhance a sliding door's security, a well-made French door is often more secure on its own. Ultimately, the overall security of any patio door depends on the quality of its materials, the locking hardware, and proper installation.

While not strictly required, it is highly recommended to shim both sides of a door. Shimming both sides allows you to make minor adjustments for wall framing that isn't perfectly plumb, ensuring the door is level and hangs evenly. This practice helps the door swing open and close smoothly, reduces the chances of the frame warping, and can be used to center the door within the wall opening. If you are working alone, you may find it easier to remove the door slab to lighten the weight while supporting the frame and inserting the shims. With two people, the process is generally faster and easier, whether the slab is left in place or not.

Most modern, standard doors are 1 ⅜-inches thick, so you should aim for this thickness unless you're building a door to replace an antique door or fit into a non-standard wall opening. Thickness varies when installing a pocket door or sliding barn door, so a good rule of thumb is to measure your existing door, if possible. For standard doors, you can also measure from the inside of the door to the door stop to gauge the proper thickness.