A new home does not always need new hardware
If the existing lock is suitable and works correctly, rekeying may change which keys operate it without replacing the whole assembly. Count every exterior cylinder you want included, including side and rear doors. Ask whether compatible locks can share one key; different brands or key systems may limit that option.
Separate your door from the shared entrance
Apartment buildings can have an individual unit lock, a common entrance and a building-managed fob system. A change at one does not automatically change the others. If you rent or live in a managed building, involve the person who can approve the work and clarify which door is in scope.
Keep the door itself in the conversation
A latch that only catches when the door is lifted may involve alignment or hardware wear. Explain whether the trouble changes when the door is open versus closed, and whether the key is hard to turn. A repair assessment can identify whether the cylinder, latch, strike or another part needs attention.
Plan for everyday use
Consider who needs access, whether keys are being shared and how a backup key will be stored. For a proposed smart lock, first check door compatibility, building permission and the physical backup method. After any change, test the door from both sides and verify every key while the work can still be checked.