Is it cheaper to rekey or replace a lock?

Rekeying is almost always cheaper. It requires only labor and a small number of pins. Replacement requires new hardware plus labor. For most situations — moving into a new property, lost keys, departed employees — rekeying achieves the same security goal at a fraction of the cost.

When should a locksmith recommend replacing a lock instead of rekeying?

Replacement is appropriate when the hardware is worn or damaged, when the keyway is incompatible with an existing master key system, when the client wants a genuine security upgrade to a higher-security product, or when the lock shows evidence of tampering or forced entry.

Can any lock be rekeyed?

Most standard pin tumbler cylinders can be rekeyed as long as the keyway remains the same. You cannot rekey a lock to a different keyway. Wafer locks, tubular locks, and some high-security designs have different rekeying procedures or may not be rekeyable at all.

Does rekeying a lock make it as secure as a new lock?

If the hardware is in good condition, rekeying restores full key security — the old key no longer works and only the new key operates the cylinder. The hardware quality and security grade do not change. For a genuine security improvement, hardware replacement or upgrade is required.

Rekeying vs. Replacing Locks: When to Recommend Each

Rekeying changes the internal pin configuration of an existing lock cylinder so that the old key no longer works and a new key does. Replacing a lock means removing the existing hardware entirely and installing new hardware. Rekeying costs a fraction of replacement and takes less time — but replacement is the right answer when the hardware is worn, incompatible with the desired key system, or a security upgrade is the actual goal. The locksmith who can explain this distinction clearly wins client trust and avoids callbacks from misaligned expectations.

Most clients who call asking to "change their locks" actually mean they want their old key to stop working. That is a rekey, not a replacement — and presenting the correct solution upfront is both more honest and more efficient than upselling hardware they do not need.

When Rekeying Is the Right Answer

Rekeying is appropriate when:

The hardware is in good condition. If the cylinder operates smoothly and shows no signs of wear or damage, rekeying the existing cylinder is the correct technical answer.
The client just moved into a new home or office. The previous occupant may have copies of the original key. Rekeying removes that risk without any hardware cost.
A key was lost or an employee departed. The goal is to invalidate the existing key, not to improve the hardware. Rekeying does this.
The client wants a common key across multiple locks. Rekeying allows multiple locks of the same keyway to be re-pinned to a shared key.
Cost is a significant constraint. A six-pin Schlage cylinder can be rekeyed for the cost of labor and a handful of pins. Replacing it with equivalent hardware costs several times more.

The default recommendation for most service calls is rekeying. Replacement should require a specific reason, not be the automatic upsell.

When Replacing Hardware Is the Right Answer

Replacement is appropriate when:

The hardware is worn or damaged. A cylinder with a sticky plug, visible keyway wear, or a loose cam is a candidate for replacement. Rekeying worn hardware produces a technically correct pin stack in a mechanically unreliable cylinder.
The keyway is wrong for the master key system. If a commercial client wants to add a door to an existing master key system and the door uses an incompatible keyway, replacement is necessary.
A security upgrade is the real goal. A client upgrading from builder-grade hardware to high-security cylinders needs replacement. There is no rekeying path to a higher-security product.
The lock has been compromised. Evidence of picking, bumping, or forced entry means the cylinder itself may be internally damaged. Replacement removes the uncertainty.
The client wants to change the keyway for key control. Moving from an unrestricted to a restricted keyway requires new cylinders — you cannot change a cylinder's keyway by rekeying it.

How to Present the Decision to Clients

Step 1 — Diagnose the hardware condition. Inspect the cylinder before quoting. If it is in good shape, lead with rekeying. If it is worn, note this and explain why replacement is recommended.

Step 2 — Ask what prompted the call. "Did you move in recently?" or "Was a key lost or stolen?" A few questions usually reveal whether the goal is key invalidation (rekey) or hardware improvement (replace).

Step 3 — Present both options with honest pricing. Give the client a rekey price and, if replacement is relevant, a replacement price with a brief explanation. "Your cylinder is in good shape — a rekey will accomplish what you need for $X. If you'd like to upgrade the hardware at the same time, that would be $Y."

Step 4 — Document what was recommended and chosen. If a client declines a recommended replacement on a worn cylinder and calls back with a problem, your records should show the replacement was offered.

The Business Case for Getting This Right

Recommending unnecessary replacements is a short-term revenue decision with long-term consequences. Clients who feel they were sold hardware they did not need do not call back and do not refer.

Recommending a rekey when replacement was needed creates callbacks. A rekeyed-but-worn cylinder that starts failing within weeks is a warranty call that costs more than the original job paid.

The locksmith who consistently makes the right call builds a reputation as a trusted advisor rather than a hardware vendor. In a referral-driven business, that reputation is the most durable competitive advantage.