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No, exterior doors don’t need to be prehung, although choosing a door that is prehung makes the installation process far easier. Installing an exterior door that isn’t prehung requires carefully maneuvering the heavy door into place in your door frame, making sure it’s level and plumb on all sides, and then attaching the hinges so that they’re perfectly level and are affixed to the right part of your frame and door. Prehung exterior doors are far more DIY-friendly.

Standard door sizes aren’t one-size-fits-all, but there are common go-to dimensions. For exterior doors—like your front door—36 inches wide by 80 inches tall is typical, though you’ll see 30- or 32-inch widths too, especially in older homes. Interior doors vary more. Bedrooms and bathrooms often use 30- to 32-inch widths, and closet doors can be anything from slim singles to wide bi-folds. Height is usually 80 inches across the board; however, always measure your actual opening. “Standard” only works if it matches what’s already in place.

WD-40 can be used on squeaky door hinges, but it is generally considered a temporary, short-term solution rather than a long-term fix. While it can silence a squeak in a pinch by breaking down rust and grime, it is not a true lubricant, as it contains only a small amount of lubricating oil that evaporates quickly. Using WD-40 alone may lead to the squeak returning and can attract dirt and dust, potentially causing more wear on the hinge over time. For a more effective and lasting solution, it is recommended to first use WD-40 to clean the hinge, then wipe it clean. Afterward, apply a dedicated lubricant such as silicone spray, white lithium grease, a metal or plastic lubricant, or an oil-based product like petroleum jelly.

A door swells up when there’s a lot of moisture in the air. Wood doors are porous, and the elements can cause them to expand with humidity and contract with dry air. Prevent swelling by coating the door in weather-resistant paint, which creates a barrier to seal out moisture. Otherwise, go with a water-repellent finish after the fact. On the plus side, this problem will go away once the weather changes.