Do Landlords Have to Change Locks Between Tenants in NYC?

The last tenant handed back two keys, the new lease starts on the first, and someone on one side of the door is asking whether the locks have to be changed before the next person moves in. In New York City, the honest answer is narrower than most people expect.

We could find no general requirement in New York's Multiple Dwelling Law, the city's Housing Maintenance Code or HPD's tenant guidance that makes a landlord change or rekey an apartment's locks between tenants. What the law does require is a working key lock, at least one key for the tenant, specific door hardware in larger buildings and self-locking entrance doors in many of them. Rekeying at turnover is not mandated, but it is standard practice and the cheapest way to make the last tenancy's keys stop working.

What the law requires at the apartment door

The city's Housing Maintenance Code, which HPD enforces, sets the baseline in § 27-2043: "The owner of a dwelling shall provide a key lock in the entrance door to each dwelling unit and at least one key." In a class A multiple dwelling, meaning a building where three or more households live on a permanent basis, that door also needs a heavy duty latch set, a heavy duty dead bolt that works with a key from outside and a thumb-turn from inside, and a chain door guard. A separate section, § 27-2041, requires the owner to provide and maintain a peephole in each apartment entrance door, with narrow exceptions.

Two more rules touch the lock itself. HPD's tenants' guide says double cylinder locks, the kind that need a key to open from inside, are "dangerous, illegal and must be removed," and HPD's owners' guide lists 24 hours as the time to correct that violation. The tenants' guide also says all apartment doors should be self-closing, and that the manager, superintendent or owner should immediately repair broken locks, which can also be reported to 311.

Notice what is missing. These rules require a working lock and a key, not a new cylinder or new keys for each tenancy.

The entrance door and the tenant's own lock

The building entrance has its own rule. Under Multiple Dwelling Law § 50-a, entrances to a class A multiple dwelling built or converted after January 1, 1968, must have automatic self-closing and self-locking doors, unless they lead to a lobby that already has them, and those doors must be locked "at all times except when an attendant shall actually be on duty." Such buildings with eight or more apartments also need an intercom that can release the door from each apartment. Again, the duty is working locking doors, not new keys when someone moves out.

The tenant side is Multiple Dwelling Law § 51-c. It gives a tenant in a multiple dwelling the right to install a lock in their own apartment entrance door, "separate and apart from any lock installed and maintained by the owner," no more than three inches in circumference, provided the landlord gets a duplicate key on request. It excludes public housing run by a municipal housing authority, hotels, motels and dormitories, and since a multiple dwelling is a building for three or more families, it does not reach a two-family house. Our post on rekeying legally when a roommate or ex still has a key explains what § 51-c covers and what it does not.

So the owner must supply a lock and a key, the tenant may add a lock and share a key, and no rule here retires the previous tenant's keys. That gap is why a turnover routine matters. This is general information, not legal advice.

Why rekeying is the usual turnover move

Between tenants, the goal is not better hardware. It is making every key from the old tenancy stop working: the tenant's set, the dog walker's copy, the spare a relative kept. Nobody can collect keys they do not know exist, so a count of returned keys proves little.

Rekeying solves that at the cylinder. The technician changes the pins inside the existing lock so it takes a new key, and every old key stops working, wherever it is. The required latch and deadbolt stay on the door.

The cost logic follows from the pricing. Our breakdown of what rekeying costs in NYC splits a typical rekey into a service call of $40 to $80, charged once per visit, plus $25 to $50 per cylinder and $5 to $15 for a pair of keys. Its one-bedroom example, a knob and a deadbolt on the same door, comes to $95 to $195. Those are typical market ranges, not a quote. For a landlord, rekeying a sound cylinder avoids paying for new hardware, and because the service call is charged once per visit, rekeying several vacant units in one visit spreads it across all of them.

Replacement is the right call when a cylinder is damaged or seized, is an obsolete profile with no pins available, falls short of the security grade you want, or is not the specific cylinder the building requires. A technician recommending new hardware should be able to name which applies.

A turnover routine for landlords and property managers

Run it in the same order every time, between move-out and move-in, and finish with a written record.

Confirm the apartment is actually vacant. Rekey only after the outgoing tenant has moved out and handed back possession. HPD explains that changing the locks on a resident without giving them a key violates the city's Unlawful Eviction Law unless there is a warrant of eviction, and that the protection covers tenants with a lease and occupants who have lawfully lived there more than thirty days. If people or belongings remain, that is a legal process, not a locksmith job.
Collect keys and fobs, and write down what came back. Compare against your key log. Missing keys are not a reason to delay the rekey; they are the reason for it.
Rekey every keyed cylinder on the unit door. If the latch and deadbolt both take a key, rekey both; they can usually share one key. For turnovers, our lock rekeying service in NYC lets you describe each door and cylinder in one request, check availability and review the estimate in the app before confirming. Check that the door still self-closes and latches, and that nobody has fitted a double cylinder lock.
Handle the mailbox through the building. USPS tells residents who lose a mailbox key to "ask the owner, manager, or superintendent of your apartment or home for a replacement," so the box is the building's to manage. Change its lock or keys at turnover. Our guide to NYC mailbox lock replacement covers who is responsible and how the change works.
Deactivate building access. Turn off the outgoing tenant's fobs, cards, codes and app access. If lobby keys have passed through many tenancies, review the entrance cylinder on its own schedule.
Keep master and restricted systems intact. In a master-keyed building, rekey the unit cylinder within the system, so the new key opens only that apartment and the master still works. With a restricted keyway, new keys come through the authorized dealer. Our post on restricted keyways and key control explains how those systems work.
Update the key log. Record the date, the cylinders rekeyed, how many keys were cut and who holds each one, including the super's or management's copy.
Hand over keys at move-in and test them together. The code requires at least one key; most households need one per person. Have the tenant try every key in every lock.

Choosing a property management locksmith for regular turnovers? Our list of documents to verify when hiring a NYC locksmith vendor covers the individual license check, insurance certificates and work orders.

Moving in: what you can ask for and do

If you are the new tenant, start by asking. In writing, ask whether the door cylinders were rekeyed or replaced after the last tenant left, on what date, and who else holds a key, such as the super. A clear answer with a date is useful; "we always do" without one deserves a follow-up.

If the locks were not changed, you have several options:

Ask the landlord to rekey. Since we found no rule requiring it, this is a request, but an easy one for an owner who already books turnovers.
Offer to arrange it yourself, with written permission. Rekeying the owner's cylinder is a lease question, so read the clause on locks and alterations and get a yes in writing. HPD's guidance adds that if a tenant changes the locks, "the law requires that you provide a copy of the key(s) to the landlord."
Add your own lock. In a multiple dwelling, § 51-c lets you add a separate lock without paying a fee for the privilege, with a duplicate key for the landlord on request. It helps only while you use it; old keys still open the original lock.
Report hardware that is broken. Tell the landlord in writing first; HPD's tenants' guide says broken locks can also be reported to 311.

If a stranger is inside or trying a key in your door, step away and call 911. For the rest of the first week, including the mailbox and the hardware around the lock, use our NYC apartment move-in lock checklist.

FAQ

Do landlords have to change locks between tenants in NYC?

Not under any general rule we could find in the Multiple Dwelling Law, the Housing Maintenance Code or HPD's guidance. The owner must provide a working key lock and at least one key. Rekeying between tenancies is good practice rather than a written mandate, and your lease may promise more.

Can a tenant change the locks without the landlord's permission?

In a multiple dwelling you can add a separate lock under § 51-c, with a duplicate key for the landlord on request, and a lease clause charging for that right is void. Rekeying or replacing the owner's lock is not covered by that section, so it depends on your lease. Either way, plan on giving the landlord a key.

Should a landlord change locks for new tenants if every key came back?

Yes, as a matter of practice. Returned keys say nothing about copies, and a standard key can be duplicated at almost any hardware counter. Rekeying retires the copies nobody remembers making.

Who pays to rekey if the landlord did not?

Nothing we found in the law assigns that cost at turnover, so it comes down to your lease and a conversation with the landlord. If you pay, keep the receipt and the written permission together.

Where LockAtlas fits

Whether you manage the building or just moved in, the job starts the same way: describe the door and the locks, check availability and review the estimate in the app before confirming. The technician is verified before they can take the job, and if the technician finds something different, such as a cylinder that needs replacing, the revised price comes back to you for approval before that work starts.