Rekeying a door lock involves altering its internal mechanism by replacing the pins, thereby changing the key combination. This allows the lock to operate with a new set of keys, rendering the old ones obsolete. DM Locksmiths advocates for investing in quality locks, as they are easily rekeyed, saving you the expense of complete replacements. We urge all new homeowners and business owners to rekey their locks to prevent unauthorized entry and potential insurance claim denials due to pre-existing keys.Â