Keeping a Lock You Like: When Rekeying Is Enough and When It Isn't

If the lock you like turns smoothly, is in good shape, and the only problem is who holds a working key, rekeying is usually enough. Rekeying changes the inside of the cylinder so a new key works and old keys don't, while the visible hardware stays put. Replace the lock when the hardware itself is worn or damaged, or can't do something you now need.

Is it a key problem or a hardware problem?

A lock decision gets easier once you separate two questions. One is about keys: who has a working copy, and whether you know where all of them are. The other is about the hardware: whether the deadbolt or handleset still operates well and does what you want.

A lost key, a move into a home where the last occupant's keys are unaccounted for, a roommate moving out, or a staff member leaving are all key problems. The lock did nothing wrong. A bolt that drags, a cylinder that has been forced, or a wish for keypad entry are hardware problems, and changing the key won't touch them.

Liking your current lock is a useful clue. If it looks right and works without fuss, the hardware has already passed most of the test. What's left is usually the key.

What rekeying changes, and what it leaves alone

Most home deadbolts and many commercial locks use a pin tumbler cylinder, the round part your key slides into. Inside are small pins of different lengths that line up only when the matching key is inserted, which lets the cylinder turn. Rekeying replaces those pins with a new set matched to a new key.

Everything you see stays the same. The deadbolt body, the handle or knob, the finish, and the holes already drilled in the door are untouched. The bolt still throws into the same strike plate, the metal plate on the door frame.

What changes is which key works. Once a cylinder is rekeyed, the old pin arrangement is gone, so lost keys, copies someone made, and keys handed to a former tenant or employee stop turning the lock. Only the new keys operate it. That makes rekeying a natural fit after a lost key, when you move into a new home, or when a tenant or staff member leaves and you can't account for every copy.

One condition applies. Not every lock can be rekeyed, and a cylinder that is worn or damaged inside may not be worth repinning. That call depends on the actual lock in your door.

When replacement wins, even for a lock you like

Replacing a lock swaps out the hardware itself, which gives you something rekeying can't: a lock in different condition or with different abilities. The reasons that justify it come from the lock, not the key.

• Worn parts: a bolt that drags or doesn't fully extend, a cylinder that wobbles in the door, or a lock that needs jiggling even with a new, correctly cut key.
• Damage from force: pry marks, a scarred cylinder face, or a bent bolt suggest the internal parts took a hit.
• A change in what you want, such as a high-security lock designed to make picking and unauthorized key copies harder, or a smart lock with code or phone access.

Some reasons only feel like replacement reasons. Not knowing who has copies, a breakup, or a departed employee all point to changing the key, and the lock you like can stay.

A bolt that binds only when the door is shut usually points to the door or frame rather than the lock. A new lock installed there would inherit the same problem, so door repair is where to look first.

Questions that settle it for your door

1. With the door open, does the key turn and the bolt move smoothly? If so, the hardware is probably sound.
2. Is your concern who might have a key, or how the lock behaves? Keys point to a rekey. Condition points to replacement.
3. Do you want the lock to do something new, like accept a code? A key change can't add that.
4. Is this one door, or several that should all open with the same key?

When you call Amsterdam Locksmith on the Upper West Side at (917) 200-2978, describe the lock type (deadbolt, handleset, or knob), how it behaves when you use it, why you want the change, and how many doors are involved. Those four details give a clear starting point for choosing between a rekey and a replacement. Amsterdam Locksmith is open 24/7.

Frequently asked questions

Will my existing door hardware still look the same after rekeying?

Yes. Rekeying works inside the cylinder, so the handle, deadbolt face, and finish look as they did before. That cuts both ways: a scratched or faded finish stays scratched or faded. If the look of the lock is what bothers you, rekeying won't change it, and that is a hardware decision rather than a key one.

If I lost a key but never had a break-in, do I still need to do anything to the lock?

A lost key matters most when someone could connect it to your door. A key on a ring with your address, ID, or mail is a stronger reason to rekey than a single key dropped somewhere unrelated. If you can't rule out that link, rekeying the lock removes the question while keeping hardware you like.

Can several locks be set to work with one key?

Often, yes. Setting several locks to one key, called keying alike, works when the locks accept the same key blank shape, known as the keyway. Locks from different makers usually don't share a keyway, so one or more cylinders may need replacing before every door can open with a single key.

Can a lock I like later be upgraded without changing the door?

In many cases, yes. Many replacement deadbolts and smart locks are made to fit the round hole already drilled through a typical door, so an upgrade can reuse the existing preparation. Whether yours fits depends on door thickness and the size and placement of those holes. A door with damaged or unusual holes may need repair first.