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The difference between a mortise latch and a tubular latch is how they're mounted. A mortise latch has a single integrated lock body. One long rectangular space is cut into the door to contain it. A single keyhole is used to unlock both the dead bolt and latch from the outside. A tubular latch is a standard setup with a dead bolt separate from the regular spring bolt latch.

You can attach the hinges to either the door or the frame first, depending on your preference. The order will not affect how the door hangs or the ease of installation. However, we recommend starting with the top hinge over the bottom one for stability, as it’s much easier to support the door from below while you install the top hinge. It will also be easier to pull the door outward from the hinges as it hangs from the top than it would be to push the door toward the hinges, as there’s less clearance on the lock side.

If you want to let in plenty of sunlight while keeping your home well insulated, your best bet is a patio-style door with two doors with full-view windows, including one primary door and one secondary door behind it, such as a screen door or storm door. This two-door system will let in plenty of natural light while maximizing insulation.

An interior French door should last you anywhere between 30 and 50 years, while an exterior French door unit will last around 15 to 30 years on average. Exactly how long your French doors last depends on the quality of the materials you choose, with vinyl doors lasting far less time than fiberglass, metal, and clad-wood doors. Upgrading to shatterproof glass can also improve the lifespan of exterior French doors.