Yes, when moving into a new home, previous tenants, neighbours, visitors, builders, cleaners or persons who are no longer authorized may still have a copy of the key that unlocks your property. In most cases the whole lock and hardware will not need to be changed, the locks can simply be re-keyed or re-coded to a new key that only you will have. Any of the old keys will no longer work giving you peace of mind that you are the only person with the new keys.