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The lock block will either be built-in on the side of the door or run from the top to the bottom. Usually, there is a marking that indicates its location. You can also tap the door with the back of a screwdriver to find the lock block like you would find a stud in a wall.

Yes, prehung doors include a door jamb. Prehung doors are sold as a single piece with the door frame already constructed, including the hinges. The only part missing is the trim, which you add after fastening the door. They are more expensive than slab doors but are quicker and easier to install. Prehung doors come in an array of sizes, so there’s likely an option to fit any doorway you need.

The best material depends on what’s more important to you: Cost? Durability? Looks? Steel cellar doors are tough, water-resistant, and heavy, while fiberglass or composite doors can give you the outdoor aesthetics you crave. Most people favor steel because of its strength against storms, but steel is also one of the more costly options.

Start by checking the top or side edge of the door. Look for a certification label or metal tag stamped with details like the fire rating and information on the manufacturer. Even if it’s painted over, the tag should still be visible. Next, look along the edges for slim intumescent strips. They’re designed to swell up and seal gaps when exposed to heat. Finally, check if the door closes itself. Most fire doors have a self-closing mechanism, like an overhead closer or spring hinges. If none of these are obvious, contact a fire safety professional to help verify your door.