When the security of your home or business needs attention, one of the most common questions is whether to rekey the existing locks or replace them entirely. Both options achieve the goal of controlling who has access to your property, but they are not interchangeable — the right choice depends on the condition of your hardware, your security goals, and your budget. Understanding the difference helps you make an informed decision rather than defaulting to the more expensive option when it is not necessary.

What Is Rekeying?

Rekeying is the process of changing the internal pin configuration of a lock cylinder so that the existing keys no longer work and a new key is cut. The lock hardware itself — the deadbolt, the knob, the lever, the strike plate — stays in place. Only the cylinder's internal pins are changed, which takes a qualified locksmith a matter of minutes per lock. The result is a lock that operates on a new key and renders all previous keys useless.

Rekeying is significantly less expensive than replacement because no new hardware is purchased or installed. It is the appropriate solution when the existing locks are in good working condition and the only concern is key control — ensuring that people who previously had keys no longer have access.

When Rekeying Is the Right Choice

Moving into a new home or apartment is the most common situation where rekeying makes sense. The key history of a property you have just taken possession of is unknown — previous owners, tenants, contractors, and real estate agents may all have copies of the existing key. Rekeying immediately after taking possession establishes genuine control over access without the cost of replacing hardware that may be relatively new and in good condition.

Other situations where rekeying is appropriate include a lost or stolen key, a relationship breakdown where a former partner had a key, a terminated employee who had access to a business, or any circumstance where you want to invalidate existing keys without changing the hardware. If the locks are functioning correctly and the hardware is in good condition, rekeying is almost always the more cost-effective solution.

When Replacement Is the Right Choice

Lock replacement is warranted when the existing hardware is worn, damaged, or of insufficient quality for the application. A deadbolt that is stiff, a cylinder that no longer turns smoothly, or a lock that was damaged during a break-in attempt should be replaced rather than rekeyed — rekeying a worn or damaged cylinder does not address the underlying mechanical problem and may leave you with a lock that fails in the near future.

Replacement is also the right choice when the existing hardware does not meet an appropriate security standard. Builder-grade locks installed during construction are often Grade 3 hardware — the lowest ANSI/BHMA security rating — and upgrading to Grade 1 hardware provides a meaningful improvement in resistance to forced entry. If you are rekeying a lock that would benefit from an upgrade anyway, replacement may be the better long-term investment.

Damage from a break-in or attempted forced entry is another clear indicator for replacement. A lock that has been attacked — even if it held — may have internal damage that is not visible from the outside. A qualified locksmith can assess whether the hardware is still structurally sound or whether replacement is the safer option.

Rekeying Multiple Locks to a Single Key

One practical advantage of rekeying is the ability to key multiple locks to operate on a single key. If your home has a front door, back door, and garage entry with different keys, a locksmith can rekey all of the cylinders to the same key profile — eliminating the need to carry multiple keys and simplifying future rekeying if access needs to change. This is a straightforward service that adds convenience without requiring any new hardware.

Getting a Professional Assessment

The most reliable way to determine whether rekeying or replacement is appropriate for your specific situation is to have a qualified locksmith assess the existing hardware. A professional can evaluate the condition of the cylinders and the overall hardware, identify any wear or damage that would make rekeying inadvisable, and recommend the right solution for your security goals and budget. In many cases, the answer is rekeying — and a locksmith who recommends replacement without examining the hardware first is not giving you the advice you are paying for.

Locksmith Care — Rekeying and Lock Replacement Across Toronto and the GTA

Locksmith Care provides professional rekeying and lock replacement for residential and commercial customers across Toronto and the Greater Toronto Area. Our licensed technicians assess your existing hardware and recommend the right solution for your situation — rekeying when the hardware is sound, replacement when it is not. Transparent all-inclusive pricing before any work begins. Available 12 hours a day, 7 days a week. Call us at 416-828-2596 for a free quote or to book a same-day appointment.