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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 can convert a pre-hung door into a Dutch door, but it’s more of a pain. Pre-hung doors are already set in the frame with the hinges and everything aligned, so once you cut the slab in half, you’ll likely need to adjust the hinge placement and maybe even mess with the frame itself. It’s doable, but expect some trial and error because it’s not a straight-swap situation.

A slab door is a standalone door without a frame or hardware. A prehung door is a complete set that includes the door, frame, hinges, and sometimes the doorknob and lockset.

In most cases, a prehung door is the better and easier option to install, especially for DIY projects or exterior applications, as they often come pre-weatherproofed. They require fewer tools and less experience to install properly. Although prehung doors are heavier and have a higher upfront cost, the investment is often worthwhile for a complete upgrade that includes a new frame.

A slab door may be a better choice if you are on a tight budget, have a custom-sized wall opening, or only need to replace the door while keeping the existing frame. While the initial cost is lower, you will need to purchase all the hardware separately and do more DIY work to hang it, which may not result in significant time or money savings.

You want a small gap of 1/8 of an inch between the door and the jamb. However, the gap size depends on the direction the door swings and whether it contains glass. You will also want to aim for the same size gap on all sides of the door, so it opens and closes smoothly.