Rekeying vs Replacing Locks: What Your Locksmith Wants You to Know

Published By Shane Debois, 26 May 2025



Ever stood in front of your door, key broken off in the lock, wondering what to do next to gain entry? Or maybe you've just moved into a new place and aren't sure who else might have the keys? We've all been there. Lock issues bring up real concerns about safety, and knowing whether to rekey or replace can save you time, money, and worry.


A professional locksmith DC can quickly assess your situation and recommend the best solution for your security needs. When faced with lock problems, many people don't realize they have options beyond complete replacement. Understanding the difference between rekeying and replacing can help you make smarter decisions about your home, business, or vehicle security.


What's the Difference Between Rekeying and Replacing?


Rekeying means changing the internal pins and springs in your existing lock cylinder. This process creates a new key that works while making old keys useless. The locksmith keeps your current hardware but alters the internal mechanism so only new keys will operate it.


Replacing involves removing the entire lock and installing a brand new one. This means new keys and completely new hardware. While it might seem like replacing is always better, that's not necessarily true. Each option has specific benefits depending on your situation.


Think about it like this: rekeying is like changing the code on your phone while replacing it with getting an entirely new phone. Both improve security, but in different ways and at different costs.


When Should You Rekey Your Locks?


Moving into a new home tops the list of reasons to rekey. You have no idea how many previous owners, renters, contractors, or relatives might have copies of your keys. Rather than wonder who could access your home, rekeying gives you peace of mind.


Lost keys present another common scenario for rekeying. Maybe your spare went missing, or perhaps you lent keys to someone who never returned them. Instead of worrying about who might find or use those keys, rekeying eliminates the risk completely.


Another good time for rekeying? When you want all your home's locks to work with one key. Tired of carrying a keychain that weighs more than your phone? Rekeying multiple locks to match a single key (called master keying) simplifies your daily routine.


Rekeying typically costs less than replacing locks. If your hardware works well and looks good, why change it? Most locks can be rekeyed in 10-15 minutes per lock, making it a quick security upgrade without breaking the bank.


When Should You Replace Your Locks Instead?


Sometimes your locks are simply worn out. If you notice wiggling, sticking, or difficulty turning the key, these signs point to mechanical failure. When locks start showing their age, replacing them makes more sense than rekeying failing hardware.


Upgrading security provides another compelling reason to replace locks. If you currently have basic locks, moving to deadbolts or smart locks offers substantially better protection. New technology brings convenience features like keyless entry, temporary codes for visitors, or smartphone control.


Style matters too. Outdated brass locks from the 1980s might function perfectly but look completely out of place on your newly renovated front door. Replacing locks lets you match your home's current aesthetic while improving security at the same time.


Damage from break-in attempts or weather exposure often necessitates replacement. Locks that have been tampered with, frozen, or corroded rarely function reliably even after rekeying. Your security is too important to trust compromised hardware.


Residential Lock Considerations


Your home deserves special attention when it comes to security decisions. Most residential properties use standard pin tumbler locks that can be easily rekeyed. If your locks are in good condition but you're concerned about who might have keys, rekeying offers an affordable solution.


For front doors, consider whether your current locks provide adequate protection. A basic door knob lock offers minimal security compared to a deadbolt. If you don't already have deadbolts installed, replacing your locks might be the better choice despite the higher cost.


Smart locks have transformed home security in recent years. These electronic options allow you to unlock doors with your phone, create temporary access codes, and even check who's entered your home and when. Upgrading to smart locks requires full replacement rather than rekeying.


Remember that different doors have different security needs. While your front door might benefit from a grade 1 deadbolt (the highest security rating), interior bedroom or bathroom doors typically need only basic privacy locks. This mixed approach often makes sense for homes.


Commercial Lock Options


Businesses face unique security challenges that often benefit from more complex solutions. Commercial properties typically use higher-grade locks designed to withstand frequent use and provide better protection against forced entry. These commercial-grade locks can usually be rekeyed just like residential ones.


Employee turnover creates one of the biggest security vulnerabilities for businesses. When staff members leave, their keys should no longer work. Rather than replacing locks each time, commercial master key systems allow easy rekeying that maintains the overall key hierarchy while removing specific access.


Many businesses now use electronic access control systems that don't use traditional keys at all. Card readers, keypad locks, and fob systems offer advantages like usage logs, time-restricted access, and instant deactivation of lost credentials. These systems require full installation rather than rekeying.


Security liability matters more for commercial properties too. If someone gains unauthorized access through outdated locks, businesses might face legal consequences. Upgrading to properly certified commercial-grade locks often makes sense from both security and liability perspectives.


Automotive Lock Solutions


Car locks work differently than building locks, though the rekey vs. replace decision remains relevant. Modern vehicles use transponder keys containing small chips that communicate with your car's immobilizer system. These sophisticated keys prevent hot-wiring and require specialized programming.


Lost car keys often prompt owners to call dealerships, who typically charge premium prices for replacements. A qualified automotive locksmith can often rekey your car's locks and program new transponder keys at a fraction of dealer costs. This specialized service makes rekeying particularly attractive for vehicles.


Damaged car locks from break-in attempts or accidents usually require replacement. Unlike home locks that mount to doors, automotive locks integrate with complex latch mechanisms and electronic systems. When these components suffer damage, replacement typically offers the only reliable solution.


Keyless entry systems have become standard on newer vehicles. These remote fobs can usually be reprogrammed rather than replaced if you lose one. However, if the physical key portion stops working in the ignition or door, you'll likely need the lock cylinder replaced or repaired by a specialist.


Cost Comparisons: What to Expect


Rekeying typically costs between $15-$40 per lock cylinder when performed by a locksmith. This price includes labor and new keys. For a typical home with four locks, expect to pay $60-$160 total, making rekeying the budget-friendly choice for most situations.


Replacement costs vary widely depending on the quality of new locks. Basic deadbolts start around $40 each, while high-security or smart locks can range from $100-$300 per lock. Add $20-$30 per lock for professional installation, and replacement quickly becomes significantly more expensive than rekeying.


For commercial properties, costs scale with security needs. High-security commercial locks might cost $150-$400 each to replace. Master key systems add complexity but prove cost-effective long-term since they simplify future rekeying needs.


Automotive key services reflect similar patterns. Rekeying and programming a new transponder key might cost $125-$250, while dealerships often charge $200-$500 for the same service. Complete ignition replacement can run $300-$600 or more, depending on your vehicle make and model.


DIY vs. Professional Services


Hardware stores sell rekeying kits for around $20 that include tools and pins to rekey several locks. While tempting, these kits require mechanical aptitude and patience. One small mistake can render your lock unusable, potentially costing more than hiring a professional initially.


Replacing locks seems straightforward enough for DIY installation. However, improper installation compromises security and functionality. Misaligned strikes, improperly seated deadbolts, or incorrect backset measurements create vulnerabilities that defeat the purpose of new locks.


Professional locksmiths bring specialized tools, extensive training, and experience to your security project. They can spot potential issues, recommend appropriate solutions, and guarantee their work. For something as important as your security, the modest cost of professional service often represents money well spent.


Remember that automotive locks and transponder keys require specialized equipment not available to consumers. DIY approaches simply aren't viable for modern vehicles with integrated security systems. Professional locksmith services offer the only practical solution for automotive lock concerns.


Conclusion


Choosing between rekeying and replacing locks doesn't need to be complicated. If your hardware looks good and works well, rekeying offers a cost-effective security upgrade. When locks show wear, damage, or you want new features, replacement makes more sense. Either way, don't postpone addressing security concerns – your peace of mind is worth the investment. Whether you need a simple rekey for your new apartment or a comprehensive security upgrade for your business, understanding these options helps you make smarter decisions about protecting what matters most.