First thing: Change the locks

Person changing locks on a door
First thing: Change the locks if You bought the house and circled “moving day” on the calendar. Before you get settled in, there are five things you need to do to your new home immediately.

The No. 1 task: Change the locks. Who knows how many people have keys to what’s now your home? The fix is easy: “It’s usually a minimum charge for a locksmith to come to the house,” says Brian Fisher.
Fisher's advice: Don’t just re-key the locks — replace the hardware, too. You get a nice update, plus peace of mind, he says.