Rekeying vs. Replacing Your Locks: Which Do You Need?

After a move, a breakup, a lost key, or a staffing change, the question comes up: should you rekey your locks or replace them entirely? Both solve the core problem, which is making old keys stop working, but they differ in cost, effort, and what you get for it.

This guide explains what rekeying actually involves, when it is the right call, and when replacement is the smarter investment.

What Rekeying Actually Means

Rekeying changes the internal pins of your existing lock cylinder so that the old key no longer works and a new key does. The lock hardware itself, the deadbolt, the knobs, the strike plate, stays exactly where it is. Only the key changes.

The work is done on site and takes roughly fifteen to thirty minutes per lock. A locksmith disassembles each cylinder, swaps the pin combination, cuts new keys to match, and tests everything before leaving. Your door looks identical when they are done.

When Rekeying Is the Right Call

Rekeying is ideal whenever your hardware is in good shape but key control has been lost. The classic cases: you just moved into a new apartment, a roommate moved out, you fired a contractor who had a key, or you simply cannot account for every copy in circulation. If the locks work smoothly and look solid, rekeying gives you a fresh start.

It is also the practical choice for landlords between tenants and for new homeowners who want immediate security on move-in day. Rekeying every exterior lock to a single new key, so one key opens everything, is a popular and sensible upgrade during the same visit.

When Replacement Is Smarter

Replace the lock when the hardware itself is the problem. Signs include a deadbolt that sticks or needs jiggling, visible rust or damage, a loose cylinder that wiggles in the door, or a lock so old that parts are no longer available. Rekeying a failing lock just gives you a new key to a lock that will still fail.

Replacement is also the moment to upgrade. If you have been considering a high-security cylinder like Mul-T-Lock or a smart lock, doing it during a planned replacement means one visit and one installation instead of two. The same applies after a break-in attempt, where the door and frame should be inspected and often reinforced.

Upgrading to High Security During a Rekey

A rekey visit is the perfect opportunity to step up to restricted keyways. Instead of rekeying your existing standard cylinders, the locksmith can install high-security cylinders keyed to a system where keys cannot be duplicated without your authorization. You get the fresh start of a rekey plus permanent key control.

This is especially popular with Brooklyn landlords and small businesses, where key turnover is constant. One rekey to a restricted system ends the cycle of unknown copies forever, and every future duplicate is tracked to you.

What the Service Visit Looks Like

Whether you rekey or replace, the visit follows the same pattern. The locksmith inspects each lock, confirms which option fits your hardware and your goals, and does the work on the spot. You will receive new keys, usually several copies, and every lock is tested in your presence.

Plan for the locksmith to need access to both sides of each door. If you are rekeying multiple locks to work with one key, mention that up front so the pinning is planned accordingly. The whole job for a typical apartment takes well under an hour.