How often should the locks on a prewar walk-up be serviced or replaced?

Most prewar walk-up locks in East Harlem and upper Manhattan should be inspected once a year, rekeyed at every tenant turnover, and replaced every seven to ten years under normal use. That schedule shifts earlier any time there is a security event, a change in who holds keys, or visible mechanical wear. Here is how to think through each situation.

When does a life event mean you should rekey or replace right away?

Certain events make waiting until the next annual check a mistake. Rekeying or replacing immediately is the right call in these situations:

• Roommate moved out. Anyone who held a key has access until you rekey. Do not wait.
• Lost keys. If a key is unaccounted for, treat it as compromised. Rekey the same day.
• After a break-in. Even if the door held, the lock may have damaged pins or a bent cylinder. Replace it, do not just rekey.
• After a breakup. If a former partner had a key, rekey before they return it or instead of waiting for it.
• After a contractor or repair crew. Contractors are often given keys or door codes. Reset smart lock codes or rekey after the job closes.
• Estate sale or inherited property. You have no record of who holds keys. A full building rekey or lock replacement is the responsible move.
• Moving into a new apartment or a bought home. The previous tenant, their guests, or the prior owner may still have copies. Rekey or replace before you move anything in.
• New tenant key handover. Landlords and supers should rekey at every turnover, not just hand over the prior tenant's keys.

For a Yorkville co-op or a Spanish Harlem walk-up, the rule is the same: if key control was ever out of your hands, restore it before assuming you are secure.

What does a proper annual lock inspection actually check?

An annual inspection is not just a glance at the deadbolt. A working locksmith checks several specific things.

Cylinder tightness. A loose cylinder is a sign the set screws have backed out or the housing is worn. On a Schlage B60N deadbolt, a cylinder that wobbles even slightly can be shimmed open. Tighten or replace immediately.

Worn pins. Over years of use, the pins inside the cylinder wear down unevenly. Keys that used to work smoothly start to catch. If you are forcing a key to turn in a Medeco Maxum or a mul-t-lock MT5+, the pins are likely the problem. A locksmith can repin the cylinder rather than replace the whole lock, which extends life at a lower cost than a new unit.

Deadbolt throw and alignment. The bolt should extend fully and seat cleanly in the strike plate. Deadbolt wear often shows up as a bolt that does not throw all the way, or one that scrapes the strike plate edge. Misalignment in an older prewar door frame is common in Harlem and East Harlem buildings where the frames have settled over decades.

Weatherproofing and lubrication. Locks on exterior doors in upper Manhattan face real seasonal stress. Salt air in winter, humidity in summer, and temperature swings cause metal components to contract and expand. Graphite powder, not WD-40, is the right lubricant for pin tumbler locks. Schlage recommends graphite for all their residential deadbolts. Apply it once a year during the inspection.

Strike plate and door hardware condition. A strong lock on a weak door frame means nothing. Check that the strike plate uses screws long enough to reach the stud, not just the jamb. This is a common weakness in prewar walk-ups where original hardware was never upgraded.

Before vacation is a smart time to run through this check. Catching a loose cylinder or a worn bolt before you leave for two weeks is far better than returning to a problem.

How do you decide between rekeying, repinning, and full replacement?

The answer depends on the age and condition of the lock, not just the situation that triggered the question.

Rekey when: The lock is in good mechanical shape but key control has been lost. This covers the roommate-moved-out scenario, new tenant turnover, and after a contractor. Rekeying a Schlage B60N or a Kwikset 980 costs less than replacement and takes about fifteen minutes. It is the right tool for a security reset with a healthy lock.

Repin when: The lock is a quality unit with worn internal pins but an otherwise intact cylinder and housing. A mul-t-lock MT5+ or a Medeco Maxum has a cylinder worth saving. Repinning restores smooth operation without discarding the higher-security hardware.

Replace when: The lock is more than ten years old, shows visible deadbolt wear, has a loose or spinning cylinder, or was compromised in a break-in. For a Harlem brownstone that just went through an estate sale, replacement makes more sense than trying to track down the lock's history. Replacement is also the right call for a preventive upgrade - swapping an old Kwikset single-cylinder for a Schlage B60N or stepping up to a Medeco or mul-t-lock for higher security.

Smart lock code reset: If you use a Schlage Encode or Yale Assure SL, a code reset handles the access-control piece, but it does not address mechanical wear. Smart locks still have physical cylinders. Inspect and service the cylinder on the same schedule as any other deadbolt.

A master key reset for a building with multiple units is its own project. For a building rekey in East Harlem or the Upper East Side, supers and landlords should work with a locksmith who can re-key every unit to a new master while maintaining individual key separation.

If you are in East Harlem, Spanish Harlem, Yorkville, or anywhere in upper Manhattan and need a lock inspection, a turnover rekey, or replacement hardware, call Morris Park Locksmith Hardware at (347) 717-7168. We stock Schlage, Medeco, mul-t-lock, and Yale hardware in-store and cut keys on-site, so most jobs can be handled the same day.

Frequently asked questions

Do I need to replace locks after a roommate moves out?

Not necessarily replace, but you should rekey immediately. Rekeying changes the internal pins so old keys no longer work, which is faster and less expensive than a full lock replacement. If the lock is already showing wear, replacing it at the same time makes sense.

How do I know if a deadbolt is worn out and needs replacing?

Common signs include a stiff or sticky throw, a cylinder that spins loosely, keys that are hard to turn, or visible scoring on the bolt face. A Schlage B60N or Medeco Maxum that is more than ten years old and showing these symptoms should be replaced rather than serviced.

Should I reset smart lock codes after a contractor finishes work?

Yes, always. Reset every temporary access code after a contractor, cleaner, or short-term guest has finished. For locks like the Schlage Encode or Yale Assure, this means deleting individual user codes through the app or keypad, not just changing the master code.