After a Breakup or a Roommate Leaves, Who Can Still Get Into Your Home?

When someone who had access to your home moves out after a breakup or a roommate split, treat their old access as unknown until every key, code, and fob is accounted for. Changing the locks is the normal way to reset that access, usually by rekeying the existing cylinders so old keys stop working. It is household upkeep, not a judgment about the person.

Who can still get in is the real question

Changing locks after a household splits often stalls on a feeling: it seems to say you don't trust the person. A narrower question works better. Who can open your door today? A former partner may have returned a key in good faith and still have a forgotten copy, or a code saved in a phone. Neither takes bad intent.

A lock change resets that. Afterward, the only working keys and codes are the ones you just handed out.

List every way into the home first

Write down each door into your space and how it opens. Keys are the obvious part. The routes people forget tend to live somewhere else:

• Spare keys left with a relative, neighbor, dog walker, or cleaner
• A copy held by the building super or management
• Copies the former occupant had cut and may not remember
• Shared keypad codes, especially one given out once and never changed
• Smart lock users and app accounts, which can open the door from a phone
• Building fobs or key cards, usually controlled by whoever runs the building's entry system
• Second doors, such as a back door, a storage room, or a lockbox

Many keypads and smart lock apps keep a user list. Treat it as part of the inventory: any code or account on that list can still open the door until it is deleted.

One more line belongs on the list: whose names are on the lease or ownership paperwork. Confirm what you can change with your landlord, property manager, or whoever handles your lease before anything is scheduled.

What order should the changes happen in?

1. Confirm with the right party that you can make the change.
2. Pick the doors. Any lock a former occupant's key opened belongs in the group.
3. Decide rekey or replace for each lock.
4. Change shared codes and remove app users at the same time the keys change, so no route stays open while the others close.
5. Try each new key in each lock, then give keys only to current occupants and keep count of how many exist.

Rekey or replace?

Rekeying changes the small pins inside the lock cylinder to match a new key. Old keys stop turning the lock, and the deadbolt, handle, and other hardware stay on the door. If the locks work smoothly, rekeying does what a household change needs: it cancels the old keys.

Replacing fits when the hardware is the problem. A bolt that drags, a cylinder that wobbles, or a key you have to jiggle all point to wear, and so does visible damage. Replacement also makes sense when you want a feature the current lock lacks, such as a keypad whose codes you can change later without cutting keys.

The days in between

If the move-out was sudden and you don't know where the keys are, an urgent lock change is reasonable rather than waiting for a convenient week. If keys were taken or a code was changed and you can't get in, that is a lockout, which is its own urgent problem.

In a shared home, the bigger risk is locking out someone who still lives there. Tell remaining roommates or family before the change and agree who gets new keys and who holds spares. For the departing person, set a time to return keys or collect belongings while a current occupant is home, so no new key or temporary code goes out. Collecting the old keys still helps you keep an accurate count.

What to have ready when you book

Note which doors are involved, what kind of lock is on each if you know (deadbolt, keyed knob, lever, keypad), and how many people need keys. Mention any keypad or smart lock, since codes and app users are part of the job, and say whether the matter is urgent or can wait for a scheduled appointment.

NoMad Locksmith & Security handles lock change and rekey work, along with smart locks, for homes in NoMad and elsewhere in Manhattan. Emergency service runs 24/7, and other work is by appointment. Call (917) 337-9703 with your access list in hand.

Frequently asked questions

Is it enough to change just the front door lock?

Changing only the front door lock is enough if the front door is the single lock a former occupant could open. Many homes have a second keyed door, or a deadbolt and a knob that take different keys. Any lock the old key or code still works on belongs in the change.

What if the former roommate never returned their key?

An unreturned key from a former roommate is the clearest case for rekeying. Once the pins in the cylinder change, that key no longer turns the lock, wherever it ended up. The same goes for copies nobody remembers making. Ask for the key back anyway, but the lock change is what cancels it.

Should smart lock codes and app users be removed as well?

Smart lock codes and app users should be removed as well. A smart lock opens for anyone with a valid code or app access, no matter who holds the physical keys. Delete the former occupant's code, change any shared code, and remove their account. If the smart lock also takes a key, rekey that cylinder too.

Should I tell my building or property manager before changing the locks?

Telling your building or property manager before changing the locks is sensible. Buildings often keep a key to each apartment, and if that arrangement continues they will need a copy of the new one. What your lease allows is a question for management or whoever handles your lease, and this guide does not answer it.