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Most modern door knobs will all fit in standard, modern doors, so if you know your door was made in the last 50 years or so, you should be fine buying a standard replacement door knob. The only exception would be a thumb latch handleset for an exterior door, as this type of door knob may not fit your door without drilling a mounting hole for the bottom of the handle. Antique or custom doors might also have different sizes and knob mounting holes, so call in a professional if you don’t believe your door is a standard one.

Most of the interior doors in your home are the same size. For example, most bedroom doors may be the same size. However, your closet doors might be the same size as each other but are a different size from the bedroom doors. You might also have bedroom closet doors that are a different size from hallway closet doors. It’s best to be safe and measure any door you want to replace.

You can use a variety of wood to build a barn door, but the most common options include 1-by boards and 2-by boards for the backing and the decorative boards on the front of the door. Softwoods like pine will save you some money and should hold up well, while hardwoods like maple and oak will stand up to more wear and tear. You could also build the backer out of plywood to minimize the cuts you need to make. Whatever you decide on, make sure the width of the wood is compatible with the mounting brackets you buy.

Adding a doggie door can allow a burglar access to knobs and locks on your door. If your pet door doesn’t come with an alarm, you can add a weight sensor alarm that will trip if anything heavier than your pet enters through it. Adding a motion sensor light to the room your pet door is in can also help deter burglars.