Rekey or Replace? What to Do With Your Locks After Moving in NYC

Rekeying a lock means a trained locksmith disassembles the lock cylinder and rearranges the internal pin tumblers so that your old key no longer works — only the new key cut to the fresh configuration will turn the lock. The lock hardware itself stays exactly where it is. Replacing a lock means the entire mechanism — cylinder, housing, trim, and all — comes out and a new unit goes in. Both services take a skilled technician anywhere from a few minutes to about an hour depending on the lock type, the door condition, and how many units need to be serviced.

Here is the practical takeaway: if your existing lock is in good mechanical condition and you simply want to cut off access for previous keyholders, rekeying is almost always the right call. It accomplishes the exact same security goal — invalidating every key that came before — without the cost or time of sourcing and installing new hardware. The exception is when the lock is worn, damaged, outdated, or simply not up to the security standard a New York apartment requires. In that case, a full replacement is the right investment.

If you've moved into a pre-war building anywhere from the West Village to Washington Heights, there's a strong chance your front door is secured by a mortise lock — a large, rectangular mechanism that sits inside a pocket (or 'mortise') cut into the door itself, rather than sitting on the surface like a standard cylindrical knob lock or deadbolt. Mortise locks are the backbone of New York City apartment security. They're robust, they've been standard in NYC buildings for over a century, and they are considerably more complex than the door knob lock you'd find in a suburban home.

Because of that complexity, mortise lock rekeying and replacement is work for an experienced locksmith — not a DIY project. The cylinder on a mortise lock is a separate component that can often be rekeyed independently, which is genuinely good news for new tenants: it means you can get full security control over your apartment without replacing the entire mortise body, which is significantly more involved. Our team at West End Ave Locksmith NYC specializes in mortise lock service across all NYC neighborhoods, from the pre-war buildings lining Riverside Drive to the converted brownstones of Park Slope. If you're not sure what type of lock is on your door, a quick call to 646-793-9435 will get you a clear answer.

For most new renters in New York City, rekeying is the right first move, and here's a concrete scenario that explains why. Imagine you've just signed a lease on a two-bedroom in Astoria. The landlord hands you two keys. You have no way of knowing how many copies were made over the previous tenancy — and under New York law, a landlord is not required to change locks between tenants unless there is evidence of domestic violence (per NYC Admin Code 27-2043.1). That means the responsibility for your own security often falls on you. A rekey costs less than a full replacement, can be done the same day, and renders every previously existing key permanently useless.

There are also situations where rekeying is the only sensible answer after a lockout. If you're dealing with what to do when locked out of house — perhaps you lost your keys or a roommate moved out and kept a copy — rekeying immediately after a locksmith lets you back in is a two-birds-one-stone solution. You regain entry and you eliminate the security risk in a single visit. That said, rekeying is not always the answer. If your lock is a flimsy door knob lock with no deadbolt, if the hardware is visibly worn or the cylinder turns loosely, or if you're moving into a ground-floor unit and want to upgrade to a higher-grade mortise lock or a Grade 1 deadbolt (like a Schlage B-series or a Kwikset 980), a full replacement gives you a genuine security upgrade, not just a key change.

Purchasing a condo or co-op in New York City adds another layer of complexity. As an owner — not a renter — you have full authority over your lock hardware, and you likely want to exercise it immediately. Beyond the question of previous residents, consider the number of people who may have held a key during the sales process: sellers, real estate brokers, inspectors, contractors. A rekey handles all of them at once. For owners of multi-unit buildings, a commercial locksmith service that includes a master key system rekey can give you individual access control for each unit while maintaining a single master — a smart security structure that property managers on the Upper East Side and in Midtown use routinely.

For owners who want to go further, this is also the right moment to evaluate the door's full hardware suite. A mortise lock with a five-pin or six-pin cylinder, combined with a quality strike plate and reinforced door frame, gives a New York apartment door meaningful resistance. Our team can assess your existing setup, explain what you have, and walk you through options — with a confirmed price before any work begins. The factors that shape your final quote include the lock type and brand, the number of cylinders being serviced, the time of day, and any parts that need to be sourced. We give you that number upfront, clearly, before we pick up a single tool.

If you find yourself in an emergency — figuring out what to do if you get locked out of your house late at night or during a weekend — our mobile emergency locksmith team is available around the clock, every day of the year. Call 646-793-9435 and a trained technician will be on their way.

West End Ave Locksmith NYC is a 24/7 mobile locksmith serving all five boroughs. Our services cover residential, commercial, and automotive needs. Here is what we offer: mortise lock rekeying, mortise lock installation and replacement, residential door knob lock installation, deadbolt installation and upgrade, apartment lockout service, house lockout response, commercial locksmith services for offices and retail, master key system design and installation, high-security cylinder upgrades, Schlage and Kwikset lock installation, smart lock and keypad lock installation, lock repair for damaged or worn mechanisms, broken key extraction, key duplication for standard and restricted keyways, mailbox lock replacement, storage unit lock service, gate lock and padlock service, intercom and access control lock integration, commercial-grade mortise lock installation for businesses, emergency locksmith response across Manhattan and all outer boroughs, car lockout service, automotive key cutting and programming, transponder key replacement, ignition lock cylinder repair, and safe opening and combination changes. Every call starts with a clear, confirmed quote — no surprises when the job is done.