It can be cheaper to rekey locks instead of changing them altogether. When you have a locksmith come out and change your locks, they will most likely charge you for the new locks, the labor, and the removal and disposal of the old locks. When you rekey locks, on the other hand, you only need to pay for the labor, which is significantly cheaper. Additionally, rekeying your locks means that you will have a brand-new key code for your doors, so you don’t have to worry about someone having access to your old keys.