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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.

Steel doors are among the most durable and longest-lasting options available, with a typical lifespan ranging from 30 to 100 years. Their longevity depends on factors such as the quality of the door, proper installation, climate, and the amount of use it receives.

While known for their resistance to wear and tear, steel doors can get dented and scratched over time. It is important to maintain them by regularly cleaning, checking the seals, and repainting them if the paint peels to prevent rusting.

On average, sliding glass patio doors can last between 20 and 30 years. Their actual lifespan depends on several factors, including proper installation, frequency of use, and regular maintenance of the sliding components. While this is the typical range, minor problems and the need for occasional repairs or part replacements can still occur. Addressing issues as soon as they arise and performing regular maintenance will help extend the door's life. If the door is older and requires frequent or significant repairs, it may be more cost-effective to replace the entire unit.

A door sill is the bottom portion of your door frame, while a threshold is the transition piece that separates the two types of flooring between rooms, or serves as the transition between the interior and exterior on an exterior door. The threshold sits on top of the door sill. A kick plate is a protective plate that sits against the face of a door to prevent damage to the door from feet and shoes. You’ll usually only find kick plates on exterior doors, while every door has a door sill, and most exterior and interior doors have a threshold.