You've got the keys to your new Manhattan apartment. The question is: who else does? Previous tenants, their roommates, dog walkers, cleaners, contractors, the super's cousin — key copies have a way of multiplying. Here's how to think about your options.
Rekeying: new keys, same locks
Rekeying changes the lock's internal pins so old keys stop working and a new set takes over. The hardware stays on your door. It takes under an hour for a typical apartment, costs far less than replacement, and completely restores key control. For most move-ins, this is the answer.
Replacing: new locks entirely
Replacement makes sense when the hardware itself is the problem — worn-out cylinders, flimsy big-box deadbolts, or locks that predate modern security standards. If your new apartment's deadbolt wiggles or the key needs a ritual to turn, replacement plus rekeying in one visit is the efficient move.
What about the building's rules?
Many co-ops and condos regulate lock appearance, keyways, and even which locksmiths may work in the building. Check your alteration agreement or ask management before changing anything visible from the hallway. Rekeying the existing cylinder almost never violates anything — it's invisible.
The move-in day checklist
Schedule the rekey for move-in day itself. Count every lock: front door, back door, terrace slider, mailbox, storage cage. Ask for keys cut alike so one key runs the apartment. And get two spares — one for your bag, one with someone you trust. It's the cheapest security upgrade in New York.