Rekeying vs. Replacing Locks: Which Should You Choose?

Should You Rekey or Replace Your Locks?

Rekey when the lock hardware is sound and you only need to invalidate the existing keys: a locksmith swaps the cylinder’s tumbler pins for $12 to $35 per keyhole, with a $75 minimum for a single lock, plus about $2 to $5 per key cut. Replace when the lock is damaged, corroded, difficult to operate, older than 10 to 15 years, or a lower security grade than you want. Rekeying and replacement are the two primary lock security services, and here is how to choose the right one for your situation.

What Rekeying Does

Rekeying changes the internal pin configuration of an existing lock so that the current keys no longer operate it. A locksmith removes the lock cylinder, replaces the tumbler pins with a new combination, and provides new keys that match the new configuration. The result: all old keys are invalid, and only the new keys work. The lock body, latch mechanism, and hardware stay in place only the key combination changes. Cost: $12 to $35 per keyhole, with a $75 minimum for a single lock; some shops instead charge $105 to $155 for the first door including the service call and $45 to $65 for each door after, plus a small charge for new keys (typically $2 to $5 per key cut).

When Rekeying Is the Right Choice

Rekeying is appropriate when: you move into an existing home and want to ensure previous occupants cannot access the home. A key is lost or stolen. A tenant moves out of a rental property. There is a relationship change that requires invalidating another person’s access. In all of these situations, the lock hardware is typically sound the security concern is about who holds the keys, not about the lock’s mechanical quality. Rekeying resolves the access concern at a fraction of replacement cost.

When Replacement Is the Right Choice

Replace when: the lock is visibly damaged, corroded, or difficult to operate. The lock is an older model that a locksmith identifies as having limited pick resistance or known security vulnerabilities. You want to upgrade to a higher security rating going from a Grade 3 lock to a Grade 1 high-security lock cannot be achieved by rekeying; the entire lock must be replaced with higher-grade hardware. You are transitioning from a mechanical lock to a smart lock the entire assembly changes. The lock was drilled during a lockout a drilled lock cannot be reliably rekeyed and must be replaced.

Working With a Contractor on This Project

Getting the right outcome on any home services project starts before the work begins. A few consistent practices make the difference between a smooth project and a frustrating one.

Get at least two or three quotes. A single quote gives you no basis for comparison. Two or three quotes reveal the market rate for the work, expose scope differences between bidders, and let you assess contractor communication quality before any commitment is made. The lowest bid is not automatically the best value if the scope is thin or the materials are underspecified.

Ask for licenses and insurance before work starts. Verify current general liability insurance and, for any work involving workers on your property, workers compensation coverage. Licensing requirements vary by state and trade; confirm the specific requirements in your jurisdiction. A licensed contractor who carries appropriate insurance protects both parties if something goes wrong during the project.

Get the scope in writing. A written proposal that specifies materials, labor scope, timeline, what is included (permits, cleanup, disposal), and warranty terms is the foundation of a professional engagement. Verbal agreements on any of these points invite misunderstanding. For any project over $500, written scope is non-negotiable.

Clarify the payment schedule upfront. A reasonable payment schedule ties major payments to project milestones: a deposit at signing, a payment at material delivery or project start, and a final payment at completion after a walkthrough confirms satisfaction. A contractor who requires full payment upfront before work begins is a red flag in any trade.

Making a Confident Decision

The information in this article is designed to help you ask better questions of the professionals you work with, evaluate their answers with more confidence, and understand the decisions involved in this type of home services project. It is not a substitute for professional assessment of your specific home.

Every home is different. Roof slopes, local weather, tree exposure, soil conditions, and existing system condition all affect what the right solution is for your specific situation. The general principles here apply broadly, but a professional who assesses your home in person will give you guidance that accounts for the details that general articles cannot.

When you are ready to move forward, getting at least two or three quotes from licensed, insured, local contractors is the most important practical step. It lets you compare approaches, assess contractor quality, and confirm that the solution proposed matches your specific situation and budget.

Locksmith Service Cost at a Glance

Here is a quick reference for common locksmith service costs. Prices reflect residential calls during standard business hours in most US markets. After-hours, weekend, and holiday calls add 50 to 100 percent to emergency service rates.

Cost Factor	Typical Range	Notes
Emergency lockout (daytime)	$75 to $250	After-hours lockout: $95 to $255. The $49 to $130 trip fee is part of that price and is owed whether or not the door opens. The time of day and day of week are the primary price drivers for lockout calls.
Lock rekeying	$12 to $35 per keyhole	priced per cylinder, plus $2 to $5 per new key, with a $75 minimum for a single lock Some shops instead charge $105 to $155 for the first door including the service call and $45 to $65 for each door after Rekeying is the most economical way to secure a new home or after key loss.
Standard lock installation or replacement	$100 to $300 per lock	including mid-grade hardware and installation Grade 1 deadbolts at $40 to $60 retail plus $75 to $125 installation labor is the typical standard residential installation.
Smart lock, supplied and installed	$295 to $495 per door	Includes the hardware; installing a smart lock you supply yourself runs $200 to $400 with programming and connectivity configuration.
High-security cylinders (Medeco, Mul-T-Lock)	$495 to $895 per opening	Patented keyways that resist picking and cannot be duplicated without authorization.

Service call fees ($49 to $130) may be charged separately from labor always ask for the all-in total price before confirming a locksmith appointment. Treat an advertised price under $50 as a warning sign: state consumer protection agencies have warned about operators who advertise a $15 to $35 service call, then demand far more in cash on arrival. (For more on this, see Questions to Ask Before Hiring a Locksmith.)