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.

When choosing a door for the space between your garage and house, steel is your best bet for fire safety. While wood—and sometimes glass—doors are common, they have lower fire-ratings. Fire-rated steel doors can withstand flames for up to three hours—double what wood can manage (90 minutes). Glass, while non-combustible, can crack under extreme heat. Steel may cost more, but it also offers the best protection. Steel isn’t the most aesthetically pleasing choice, but as long as your door meets the International Residential Code (IRC) standards, it’ll do its job in protecting your family and home.

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.

French doors that open to exterior spaces are often installed to swing inward, as this makes them more secure than outward-swinging doors, due to the interior hinges being inaccessible from the outside. For interior doors, it’s personal preference which direction to hang your doors, but it’s common to have them open into the larger of the two spaces they’re separating.