When should you replace a mailbox lock instead of just rekeying it?

Replace it if the key won’t turn smoothly even with light pressure, if the housing shows visible corrosion or cracking, or if a piece of the key has broken off inside. Rekeying only changes the pin configuration; it doesn’t fix worn or damaged parts.

How do you know when it’s time for a new mailbox lock?

The major signs are when the door is not seated flat anymore, the key rattles around the keyway after it’s been lubricated, or the key won’t retract completely when it’s turned.

When you’re replacing a lock for your mailbox, is it any different from a regular rekey?

Yes. A rekey is performed on the existing cylinder; the keys are updated so they no longer work with the old cylinder, but the cylinder is not replaced. Replacement involves replacing the cylinder or the lock assembly, since it is physically worn out or damaged.

Can a locksmith program a lock on a cluster box unit?

Yes, but the replacement cylinder must be of a standard approved by the USPS and in some cases, the HOA or postmaster will need to approve the job before the locksmith installs it.