Closing day gives you ownership, but it does not tell you how many keys are already out in the world. Previous owners, relatives, neighbors, contractors, cleaners, dog walkers, real estate agents, and maintenance workers may all have had copies at some point.
Rekeying after buying a house is a practical access-control step. It is not dramatic, and it does not require replacing every lock when the existing hardware is good. It simply makes old keys stop working.
Why rekeying matters after closing
You cannot manage keys you never received. Even if the seller handed over several keys, there is usually no reliable way to know whether every copy came back. Rekeying resets the lock cylinders so only the new keys work.
This is especially useful for homes that had contractors, renters, house cleaners, short-term guests, or family members coming and going before the sale.
Which doors to include
Walk the home and identify every exterior entry point. That usually includes the front door, back door, garage-entry door, basement door, side door, patio door, detached garage, and any keyed gates or storage areas. Interior locks usually do not need the same attention unless they protect a specific room or office.
Ask about keying alike
If compatible locks are installed, a locksmith may be able to key several doors alike so one key opens the main exterior doors. This is often more convenient than carrying separate keys for each door. If some hardware is not compatible, the locksmith can explain which pieces would need to change to make the system match.
When to replace hardware instead
Use the rekey appointment to check whether any lock is loose, worn, damaged, hard to turn, or missing a proper deadbolt. Rekey the locks that are solid, and replace the hardware that no longer belongs on an exterior door.
Common Questions
How soon should I rekey after buying a house?
Ideally, schedule it close to move-in or shortly after closing so old keys stop working before the home is fully occupied.
Do I need to replace every lock after buying a home?
Not if the locks are in good condition. Rekeying is often enough to reset access. Replace locks that are worn, damaged, or below the level of security you want.
Can rekeying be done while I am moving in?
Yes. A mobile locksmith can usually rekey exterior doors at the home while you are there, as long as there is access to the locks and proof you are authorized.