Rekey vs. Replace: Which Do Your Locks Actually Need?

Short version: rekey when the problem is the keys; replace when the problem is the lock. Rekeying changes the pins inside your existing lock so old keys stop working and a new key takes over — the hardware never leaves the door. Replacement swaps the hardware itself. Rekeying is usually the cheaper of the two by a comfortable margin, which is exactly why an honest locksmith asks about your situation before recommending either.

• You moved into a new home — including brand-new construction, which is typically opened with contractor keys during the build.
• A key is lost, stolen, or unaccounted for — if you can’t control the key, change what it opens.
• A tenant, roommate, employee, or contractor moved on — and keys did or didn’t come back.
• You want one key for every door — compatible locks can be rekeyed to match a single new key.

In all of these, the hardware is fine; it’s the key population that’s the problem. Rekeying resets it in one visit.

• The lock is worn out — sticking, gritty, loose, or needing a wiggle ritual to turn.
• The hardware is damaged — after a break-in attempt, a snapped key that scored the cylinder, or years of weather.
• You want a genuine upgrade — stepping up from builder-grade hardware to a Grade 1 or Grade 2 deadbolt, or adding a smart lock or keypad.
• The style is wrong — new door, new finish, new look.

Here the lock itself has failed or fallen behind, and a lock change is the honest fix. (After a break-in, have the frame and strike plate checked too — that’s usually what actually gave way.)

Absolutely — and it’s often the smartest path. A typical move-in visit might rekey three healthy locks, replace one corroded back-door deadbolt, and key everything to a single new key. That’s the advantage of having a residential locksmith look at the actual doors instead of choosing a package off a menu.