Rekey vs replace: when each one makes sense, and the cost difference

Most NYC tenants who change their locks pay five times what the job actually requires. Not because the locksmith is overcharging. Because the conversation starts with "I want to change my locks" instead of "I want only the people I authorize to have keys to my apartment." These are not the same problem.

Rekey solves the second one for about a fifth of the cost of solving the first one. The reason most people end up replacing instead of rekeying is that they do not know rekeying exists.

This piece walks through what each option actually does, when each makes sense, what the cost difference really is, and the three NYC-specific situations where the choice is forced for you.

What rekey actually means

Rekeying a lock means changing the internal pin configuration so that the existing key no longer works. The lock body, the cylinder housing, the strike plate, and the door hardware all stay in place. The technician disassembles the cylinder, swaps the pin set for a different combination, and cuts a new key (or set of keys) that matches the new pin configuration.

The lock is the same lock. The key is different. Anyone with the old key cannot open the lock.

This is the right answer for the most common reason NYC tenants change locks: they want to invalidate the old keys without buying new hardware.

When rekey is the right choice

Five situations where rekey is the correct decision:

Move-in to a new apartment. Previous tenant had keys. Previous tenant's friends had copies. Previous management staff had access. Rekeying the existing locks invalidates all of those keys at once. Cost: $90 to $200 for a typical NYC one-bedroom (2 cylinders). The full move-in security sequence is in moving into a NYC apartment: the 7-day lock checklist.

Roommate moves out. Same logic. The departing roommate's key, plus any copies they made, become inactive. New roommate gets a key cut to the new configuration. Cost: same range, $90 to $200.

Estranged partner or family member. Faster and cheaper than full replacement. The lock works the same; the access list changes.

Lost keys without confidence they were secured. A lost key that you suspect was found by a stranger, or that was attached to your address (key fob with apartment number), warrants rekeying. A lost key from a backpack that fell in your car is less urgent.

Building changes management companies. Less common, but worth doing. Building staff often retain master keys after transitions. Rekeying the apartment cylinder restores tenant-level access control.

In all five cases, the lock is functional and the only thing changing is who can open it. Replacing the lock would solve the same problem at significantly higher cost.

When replace is the right choice

Five situations where replacing the lock is the correct decision:

The lock is damaged or worn. Cylinders wear out. After 15 to 25 years, pins seat unevenly, the keyway accumulates debris, and the lock starts sticking or failing to turn. Rekeying a worn lock produces a rekeyed worn lock. Replace it.

The lock has been picked or drilled in a break-in attempt. Even if the lock still functions, the integrity is compromised. Visible drill marks or scratches around the keyway are signals. Replace.

You are upgrading from a consumer-grade lock to a high-security lock. Rekeying a Kwikset produces a rekeyed Kwikset. A Medeco or Mul-T-Lock upgrade is a replacement. Full comparison in Medeco vs Mul-T-Lock vs Schlage.

The lock is a different model than the deadbolt and they need to match. Common in old NYC walk-ups where the original lock and a later-added deadbolt are from different brands. Matching the cylinders to a single key requires replacing one of them.

The keyway is restricted and you do not have access to the dealer. Restricted keyways (Medeco, Mul-T-Lock) only allow authorized dealers to cut keys. If the dealer relationship has broken down (building changed managers, original installer is out of business), the practical answer is to replace the lock with a new restricted keyway you control.

These five cases share a common feature: the lock itself, not just the key list, is what needs to change.

The actual cost difference

Numbers for a standard NYC one-bedroom apartment (front door cylinder plus deadbolt, 2 cylinders total) in 2026.

Rekey both cylinders.

Service call: $40 to $80
Per-cylinder rekey: $25 to $50
Two new keys cut: $5 to $15
Total: $95 to $195

Replace both cylinders (standard pin tumbler, like-for-like).

Service call: $40 to $80
New cylinders: $40 to $160 (2 × $20 to $80)
Installation labor: $80 to $160
Two new keys cut: $5 to $15
Total: $165 to $415

Replace both cylinders with high-security (Medeco, Mul-T-Lock, Schlage Primus).

Service call: $40 to $80
New cylinders: $240 to $700 (2 × $120 to $350)
Installation labor: $200 to $400
Two new keys cut: $10 to $25
Total: $490 to $1,205

The full range of NYC locksmith pricing is in the 2026 NYC locksmith cost guide.

Two takeaways from these numbers.

Rekey is roughly half the cost of like-for-like replacement. The savings is not 5x in this case; it is 2x. The 5x figure comes from people who replace with high-security when rekey was the actual need.

High-security replacement is a real investment. $500 to $1,200 is the right number for a meaningful security upgrade. This is not the path for "I want to invalidate the old keys." It is the path for "I want substantially better protection than what I currently have."

NYC-specific situations where the choice is forced

Three scenarios where the rekey-vs-replace decision is not yours alone.

Co-op buildings with master key systems. Many NYC co-ops run a master key system where the building staff (super, doormen, management) can access individual apartments for emergencies. Rekeying or replacing the apartment cylinder breaks the master key compatibility. Some co-op boards require notification before any lock change; some require the new lock to be a specific brand to maintain master compatibility. Check your board's rules before scheduling work. Full breakdown in co-op board rules on lock changes.

Rental apartments with landlord-supplied keys. Under NY Multiple Dwelling Law § 50-a, tenants can install a deadbolt at their own expense and must provide a duplicate key to the landlord. Replacing the primary lock entirely typically requires landlord approval and is treated as an alteration to the unit.

HUD or rent-stabilized buildings. Specific regulations may apply to lock changes. Building managers in these properties usually have established processes. Asking the building first prevents surprises.

In all three, the locksmith is not the gatekeeper. The building or landlord is.

The hidden cost: key control after the change

The rekey or replace solves the lock problem. The key control problem starts at that point.

A rekeyed lock with three keys is more secure than the old lock if all three keys are tracked. It is less secure than the old lock if one of the new keys gets lost and the search for it is not done.

Two practices that solve this:

Cut the exact number of keys needed. Most NYC tenants ask for "three or four spares" out of habit. The right number is the number of people who actually need access. Two roommates plus one trusted backup is three keys. Anything beyond that is unaccounted-for inventory.

Track keys by physical tag or color. A spare hidden with a neighbor should be visually distinct from the daily-carry key. A lost spare that looks identical to the daily-carry key creates ambiguity. A lost daily-carry key that is clearly the daily-carry key is unambiguous.

These practices cost nothing and dramatically reduce the frequency of "I lost a key and don't know which one" scenarios that drive the next rekey decision.

What a verified locksmith does differently

The rekey-vs-replace conversation is one of the easiest places for a scam operation to push toward the more expensive option. A technician on commission, asked "rekey or replace," will often answer "this lock is too old to rekey, has to be replaced," when the lock is fine.

The verification path is the same as for any locksmith work. DCWP license. Written quote for both options. Right to refuse if the on-site assessment differs from the written quote. Full sequence in the locksmith verification checklist.

A platform-based booking like LockAtlas removes the commission incentive by setting the price before dispatch. The technician is paid the same whether the job is rekey or replace; the customer chose at booking time, based on a photo of the lock. The mechanism is described on the LockAtlas download page.

FAQ

How long does a rekey take?

15 to 30 minutes per cylinder for a skilled technician. A two-cylinder NYC apartment is typically a 45-minute visit.

Can I rekey a lock myself?

Yes, with a rekey kit specific to the lock brand. Kwikset SmartKey can be rekeyed without disassembly using a special tool. Schlage and Medeco require partial disassembly and the matching pin set. The DIY route saves the service call ($40 to $80) but introduces the risk of misassembly, which can leave the lock unusable. For most NYC tenants the math favors hiring a DCWP-licensed locksmith.

What if my landlord rekeys without my knowledge?

Landlords cannot change a tenant's locks without notice and access. Under NY Real Property Law § 235-e, unauthorized lockouts are unlawful. If you arrive home and your key does not work, document the situation (photos, time-stamped), then file with the NYC Housing Court Help Center if needed.

Can I rekey a lock to match an existing key from a different lock?

Yes, this is called "keying alike." Both locks are rekeyed to the same pin configuration. This is common in NYC for matching a deadbolt to a knob lock so one key works both. Cost is the rekey of one lock; the existing key from the matched lock works for the rekeyed one.

How often should I rekey if no one has lost a key?

Once every 5 to 7 years as a hygiene practice. Pin wear, accumulated key copies that you have forgotten about, and the cost of a $100 rekey versus the cost of a security incident make the calculus favor periodic rekeying. Most NYC tenants do not do this. The ones that do are often the same ones who do not have lock-related problems.

The rekey-vs-replace decision is one of the cheapest security upgrades available to NYC tenants when done correctly. The structural mistake is to default to replacement when rekey would solve the problem. The cost benchmarks are in the 2026 NYC locksmith cost guide. The full apartment security sequence is in moving into a NYC apartment: the 7-day lock checklist.

LockAtlas is live now on the App Store and Google Play, serving all five boroughs of NYC. Questions or partnerships: support@lockatlas.com

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