Why change locks after buying a Cupertino home
Every previous owner, prior tenant, agent, and contractor may still hold a working key or garage remote. A lock changeover closes that gap without assuming anything about who kept a copy.
Start with the primary entry points: front door, back or side door, and the garage entry door if the garage connects to the house. These see the most key hand-offs over a property's history and are the first priority on move-in day.
Next, check secondary access: side gates with keyed hardware, storage or shed locks, and the mailbox lock if the cluster box assignment did not change automatically. Each of these can be rekeyed in the same visit as the main doors.
If the home has a smart lock or keypad deadbolt already installed, plan to factory-reset the code and re-pair any connected app before relying on it, since old codes and paired devices may still work otherwise.
Before requesting help, note the lock brand or style if visible, whether any hardware looks damaged or mismatched, and which access points are the priority for day one versus later in the week.