he first thing you need to do is have new locks installed in all the entry doors. If the doors do not have deadbolts, now is the time to add them. Because you cannot be sure that you possess all of the existing keys, the best thing to do is start fresh on every lock on the property. Working with a locksmith to change all the locks will ensure that the house is secure.
Entry locks are those locks that secure your front and back doors and any door that leads directly into the home. The locks can be keyed alike for these doors, but keep in mind that means anyone with a key can then open all the entry doors on the house.
But if the locks don't use the same keys, someone with a key will have to try every door to find the one it will open. When someone that does not belong there is poking around, a neighbor may be able to see them and notify the police.
If you have a sliding glass door on your home, the lock that secures it may or may not have a keyed locked on it. If the door does have a lock, getting a locksmith to change the cylinder is a good idea.
Another good idea is installing a door bar in the track that prevents the door from sliding in the frame. Often people use a piece of wood or pipe and lay it in the track, but a door bar is designed to lock into place and is much harder to jar loose than the old broom handle in the track.