Rekeying changes the pins inside your existing lock so old keys stop working. Lock replacement rips out the hardware and puts new hardware in its place. Most homeowners who just moved into a place in Montgomery County or Arlington need a rekey, not a replacement. They pay for a replacement anyway, because nobody told them the difference.
That’s the whole post in one paragraph. The rest is when each one is actually right, and how to tell which situation you’re in.
What rekeying actually does
A pin tumbler lock has small pins inside the cylinder. Your key lifts those pins to a specific height. When the heights line up, the cylinder turns. A rekey is a technician pulling the cylinder, swapping the pins for a new combination, and cutting a new key that matches.
The lock on your door stays. The deadbolt stays. The strike plate, the screws, the finish, all of it stays. What changes is the internal pin pattern, which means any old key cut for the old pattern becomes a useless piece of metal.
This is faster than a replacement and uses less hardware. For a typical home with three or four exterior locks, a tech can rekey the whole house in one visit and leave you with one key that opens every door.
What lock replacement actually does
Replacement is exactly what it sounds like. The old deadbolt or knob comes off. A new one goes on. You get new hardware, new keys, and a fresh start.
You’d think this is always the “better” option because you’re getting new stuff. It isn’t. New hardware costs more in parts. It can also create alignment issues if the new lock doesn’t sit identically to the old one, which means longer install time and sometimes a small adjustment to the door frame. If the old hardware was working fine, replacing it is paying for a benefit you already had.
There are situations where replacement is the only honest answer, though. We’ll get to those.
When rekeying is the right call
Four scenarios where rekey almost always wins:
- You just moved in. You have no idea who has copies of the old keys. The previous owner, their adult kids, a dog walker, a contractor, an ex. A rekey kills every one of those keys in one shot. The hardware on the door is probably fine.
- You lost a key and can’t account for where it is. Same logic. The lock works. You just need the key that’s missing to stop being a valid key.
- You want one key for every door. Most houses end up with three or four different keys for the front, back, garage entry, and side door. A rekey can standardize them so one key works everywhere, assuming the locks are the same brand and keyway.
- You fired someone with access. Cleaner, nanny, contractor, anyone you gave a key to and now want to lock out. Rekey is faster and cheaper than replacing every cylinder.
In all four cases, the locks themselves are doing their job. The problem is key control, not hardware.
When lock replacement is the right call
Three scenarios where replacement is the honest recommendation:
- The lock is physically damaged. Broken cylinder, snapped latch, deadbolt that doesn’t fully retract, a knob that wobbles in the door. Pins can’t fix a structural problem. New hardware can.
- The lock is old or low-grade. Builder-grade hardware from twenty years ago is not the same as a Grade 1 or Grade 2 deadbolt you’d put in today. If you’re securing a home in DC or Fairfax County and the deadbolt has visible wear, brittle finish, or a wobbly throw, upgrading the actual hardware is the upgrade you need.
- You want a smart lock. Keypad entry, app control, auto-lock, guest codes for short-term rentals. You can’t rekey a traditional deadbolt into a smart lock. You’re replacing the hardware either way.
There’s also a fourth case that sits between the two: a break-in. If someone forced the door and the lock took damage, replace it. If they got in through a window and the locks are untouched, a rekey is fine. The decision turns on whether the hardware was compromised, not on the emotion of the event.
FAQ
Is rekeying as secure as replacing?
If the lock is in good condition, yes. Both approaches stop old keys from working. Security comes from the lock’s grade and condition, not from whether it’s new or rekeyed.
Can every lock be rekeyed?
Most standard residential pin tumbler locks can. Some high-security locks need manufacturer authorization, and most smart locks can’t be rekeyed in the traditional sense. A technician can tell you on site which bucket your lock falls into.
Should I rekey or replace after buying a house in the DMV?
If the existing locks are in decent shape, rekey. You’re solving the “who else has a key” problem without paying for hardware you don’t need. If the locks are old, damaged, or builder-grade, that’s the moment to upgrade.
Can I rekey just one lock, or do I have to do them all?
You can do one. Most people do all the exterior locks at once so they end up with a single key. Doing them separately works, you just end up with multiple keys.
Getting it right the first time
The wrong call costs you twice. Replacing when a rekey would have worked means paying for hardware you didn’t need. Rekeying when the lock was actually broken means paying a tech twice in the same month. The good news is the right answer is usually obvious once someone looks at the door.
If you’re not sure which one your situation calls for, that’s a normal call to make. Our team handles both across DC, Maryland, and Virginia, and we can tell you on the phone or on site which one fits. You can see the full list on our residential, commercial, and automotive services page, or call (301) 945-8564 and we’ll walk through it with you. Prefer to write it out? Reach out through our website and we’ll get back to you.