Rekey Locks After Moving In: A How-To Guide
Updated: 4 days ago
Table of Contents
Why You Should Rekey Locks After Moving In
Rekey vs Replace Locks: Which Option Is Right for You
When Rekeying Makes Sense
When Full Replacement Is Better
How Rekeying Works: The Lock Mechanism Explained
Cost to Rekey Locks vs Full Replacement
DIY Rekeying vs Professional Locksmith Services
What You'll Need for DIY Rekeying
Step-by-Step DIY Rekeying Process
How to Fix Jammed Door Lock Issues During Rekeying
Smart Lock Compatibility and Modern Security Options
Conclusion
Frequently Asked Questions
Last Updated: September 3, 2026
Why You Should Rekey Locks After Moving In
When you move into a new home, rekeying the locks is an essential security step. The previous owners, their family members, contractors, real estate agents, and others who had access during the sale all possess keys to your home. You have no way of knowing how many copies exist or who might have duplicates.
Rekeying locks gives you control over your property's entry points and eliminates this uncertainty. The solution is straightforward: change the internal mechanism so old keys no longer work, without replacing the entire lock hardware. This budget-friendly approach preserves your existing deadbolts while giving you the security of being the only keyholder.
However, full replacement makes more sense in some situations. If your locks are old, damaged, or you're upgrading to smart locks, replacement becomes the better path. Understanding when each option applies ensures your home security actually improves.
Rekey vs Replace Locks: Which Option Is Right for You
The choice between rekeying and replacing locks depends on your specific situation, budget, and security goals. Both approaches solve the fundamental problem of unknown key holders, but they differ in cost, permanence, and what they accomplish.
When Rekeying Makes Sense
Rekeying works best when your existing locks are in good condition and you want a cost-effective security solution. If your deadbolts function smoothly and you're satisfied with the style and brand of your current locks, rekeying is the logical choice.
This approach is particularly practical for apartment dwellers and renters. For homeowners with multiple entry points, rekeying each lock is significantly less expensive than replacing all of them.
When Full Replacement Is Better
Full lock replacement becomes the better choice when your existing hardware is worn, damaged, or outdated. If your deadbolts stick, the keys are difficult to turn, or the locks show visible rust or corrosion, replacement addresses these functional issues while improving security.
Upgrading to smart locks or high-security locks requires replacement. If you want keyless entry, remote access, or locks with restricted key blanks that prevent unauthorized duplication, you need new hardware. Replacement is also justified if you suspect master key systems used by previous owners, landlords, or property managers. If your locks are more than 15-20 years old, replacement provides both security and peace of mind.
How Rekeying Works: The Lock Mechanism Explained
Rekeying changes which key opens your lock by replacing the internal pins inside the lock cylinder. The lock cylinder contains spring-loaded pins at different heights (peer-reviewed research). When you insert the correct key, those pins align at precisely the right level, allowing the cylinder to turn and the deadbolt to operate.
The rekeying process begins with removing the lock cylinder from the door. The locksmith removes the old pins and springs from inside the cylinder. A special tool called a plug follower holds the springs in place while removing the old pins, preventing springs from escaping.
Once the old pins are out, the locksmith installs new pins cut to match your new key. The specific heights and positions of these pins determine which key will work. After installing the new pins, the locksmith tests the lock with your new key to ensure smooth operation. The cylinder is reinstalled into the door hardware, and the lock is ready to use.
Cost to Rekey Locks vs Full Replacement
Professional rekeying typically costs less than full lock replacement because you're keeping the existing hardware. A locksmith charges for labor and the new key blank, not expensive new lock mechanisms (aloa.org). Full lock replacement involves purchasing new hardware for each entry point, representing a substantial investment, especially if you're securing multiple doors.
The decision often comes down to your current lock condition and your security goals. If your locks function well and you only need to address the previous owner's keys, rekeying is the economical choice. If you're upgrading security or installing smart locks, the additional cost of replacement may be justified by the improved functionality and security features you gain.
Bay Safe and Lock can provide a detailed estimate for your specific situation. Getting a professional assessment ensures you understand your options and their true expenses before committing to either approach.
DIY Rekeying vs Professional Locksmith Services
The choice between doing rekeying yourself and hiring a professional locksmith involves weighing cost savings against complexity, time, and the risk of mistakes that compromise security.
What You'll Need for DIY Rekeying
If you decide to attempt DIY rekeying, you'll need a rekeying kit designed for your specific lock brand. These kits include new pins cut to your new key specification, a plug follower tool, and instructions. You also need a small screwdriver set, tweezers for handling tiny pins, and a bright light to see inside the lock cylinder clearly.
Most importantly, you need the correct rekeying kit for your specific lock model. Kwikset, Schlage, and other manufacturers produce kits, but they're not interchangeable. Using the wrong kit results in locks that don't function properly.
Step-by-Step DIY Rekeying Process
Remove the lock cylinder from your door by locating the retaining clip on the interior side. Insert the plug follower into the cylinder to prevent springs from flying out when you remove the old pins. Carefully extract the old pins using tweezers, working slowly and methodically.
Insert the new pins from your rekeying kit in the correct order, as specified in the instructions. Each pin has a specific height, and installing them in the wrong order means your new key won't work. Test the lock with your new key before reinstalling it in the door. The cylinder should rotate smoothly when you insert the key and turn it gently.
Once the lock functions correctly, reinstall the cylinder into the door and secure the retaining clip. Test the lock from both sides of the door to ensure it operates smoothly and the deadbolt extends and retracts properly. This process requires patience and mechanical aptitude; many homeowners find it challenging.
How to Fix Jammed Door Lock Issues During Rekeying
A jammed door lock often results from dirt, debris, or corrosion inside the lock cylinder. Applying silicone-based lubricant helps in some cases, but using the wrong lubricant can make the problem worse. If your lock is stuck, insert the key and gently work it back and forth without forcing it.
For severely jammed locks, professional help is warranted. A locksmith can disassemble the lock, clean the internal components, and address the underlying cause. After rekeying, ensure the lock operates smoothly with your new key before considering the job complete.
Smart Lock Compatibility and Modern Security Options
Modern homeowners increasingly consider smart locks as part of their security strategy. Smart locks eliminate the need for physical keys entirely, solving the "previous owner's keys" problem completely because no physical keys exist.
Smart locks require compatible door hardware and electrical power. Battery-powered smart locks are common for residential use, but they require periodic battery replacement (nist.gov). Remote access allows you to grant temporary access to guests, contractors, or service providers without giving them physical keys. Activity logs show who accessed your home and when, providing a security record that physical keys cannot offer.
For homeowners planning to upgrade to smart locks, full lock replacement is necessary. Rekeying a traditional lock makes less sense if you're going to replace it with a smart lock in the near future.
Consideration | Rekeying | Full Replacement | Smart Lock |
Cost | Lower | Higher | Highest |
Time to Install | 1-2 hours | 2-4 hours | 2-3 hours |
Key Control | Good | Excellent | N/A (no keys) |
Future Flexibility | Limited | Good | Excellent |
Best For | Budget-conscious | Upgrading hardware | Modern convenience |
Conclusion
Rekeying locks after moving in is a practical security step that addresses the vulnerability of unknown key copies held by previous owners and others. The choice between rekeying and full replacement depends on your lock condition, budget, and security goals. Rekeying works well for functional locks you want to keep; replacement is justified when you're upgrading hardware or installing smart locks.
When you're ready to secure your new home, Bay Safe and Lock provides professional rekeying and lock replacement services tailored to your specific situation. Our licensed and insured team can assess your current locks, explain your options, and execute the work efficiently. Whether you need a single lock rekeyed or a complete security upgrade with smart lock installation, we deliver the expertise and reliability homeowners trust. NEED AN ESTIMATE FOR YOUR PROJECT? CLICK HERE to schedule your consultation with Bay Safe and Lock today.
Frequently Asked Questions
Q: Is it cheaper to rekey locks or replace them?
A: Rekeying is typically more budget-friendly than full replacement because you keep the existing lock hardware and only change the internal pins. Replacement requires new locks, deadbolts, and installation labor. For a typical home with multiple entry points, rekeying all locks costs significantly less. The exact savings depend on the number of locks, their condition, and whether you hire a professional locksmith or attempt DIY rekeying.
Q: How much does it usually cost to rekey a lock?
A: Rekeying costs vary based on lock type, quantity, and whether you use a professional or DIY approach. For a detailed estimate tailored to your property, contact Bay Safe and Lock for a quote. Professional installation ensures proper security and lock integrity, while DIY rekeying requires purchasing a rekeying kit and investing time in the process.
Q: Does rekeying mean replacing the entire lock?
A: No. Rekeying keeps your existing lock hardware in place and only replaces the internal pins and springs inside the lock cylinder. This changes which key will open the lock without removing the deadbolt or other hardware from your door. Full replacement removes and installs entirely new locks, which is more expensive but necessary if locks are damaged, broken, or incompatible with your security needs.
Q: How many people might have keys to my new home?
A: Previous owners, their family members, contractors, real estate agents, and anyone they gave spare keys to may still have access to your home. This security risk is why rekeying after moving in is essential. You cannot know how many key blanks were duplicated or distributed over the property's ownership history. Rekeying immediately after purchase or lease ensures only your keys open the locks.
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