Have you ever lost your house keys and worried about a stranger getting in? Unless you're the first occupant of the property, you never can be sure how many copies of your keys are out there.

Living arrangements change, and sometimes we need to prevent someone who has, once had, or may have a key to our home from being able to use it again. In situations like these, we might assume that ...

Q: I recently moved into a new house and would like to get the locks changed, as I don’t know how many people have keys to my home. Rather than pay a locksmith, I saw a do-it-yourself kit that I would ...