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As long as you do it carefully, you can sand and restain hollow core doors. However, it’s risky because the veneers on hollow core doors are so thin that sanding and restaining might cause damage to the doors. If you do move forward with this project, sand the doors lightly with a medium-grit sandpaper.

The width of your door jamb should match your wall thickness exactly, so it depends on your wall. For standard door openings, the width is equal to the width of a 2-by-4-inch  stud, plus the width of the drywall on both sides—about 1/2 inch each—which comes out to 4 9/16 inches. Block walls and framed walls that use 2-by-6-inch framing require a door jamb that’s 6 9/16 inches. You should always measure your finished wall thickness to get an accurate width for your door jamb material.

No, cellar doors are not all the same size, although they are standardized. Typical sizes are 4 feet or 6 feet wide. Keep in mind that if your cellar bulkhead is very old, it’s probably not standardized. Instances like that are when steel foundation plates can come in handy to ensure your new doors will fit.

A prehung door is a door that comes ready to install, already mounted in its frame with hinges and stop molding included. Because everything is factory-aligned, installation is quicker, more precise, and convenient, as you don't need to drill or align the hinges yourself. This makes it a smart option if your current frame is damaged, uneven, or if you're working on a new build. Installation involves fitting the entire unit into the rough opening, shimming and leveling it, and then securing it. If you are replacing an existing prehung door, the process is even simpler, often just requiring you to swap the old unit for the new one and secure it with a few screws. Prehung doors typically cost only slightly more (around $20) than a door slab alone, making them an efficient choice.