When you get a key duplicated, you're trusting someone with access to your locks and the security of your home or business. Understanding what warranties and guarantees come with that service—and what won't be covered—can save you frustration and money down the line.
What Warranties Typically Cover
Most key duplication services offer a basic warranty against defective copying, usually lasting 30 to 90 days. This means if the key doesn't work in your lock, the provider will re-cut or replace it for free during that window. However, this warranty applies only to manufacturing defects, not wear, damage from misuse, or keys that were cut incorrectly because you provided a worn original.
A reputable key cutter will test your duplicated key before handing it over. If it doesn't turn smoothly or gets stuck, they should adjust or redo it immediately—that's standard practice, not an upsell. Always ask to test the new key on your lock (or a test lock if you're duplicating a spare) before leaving.
What Warranties Typically Don't Cover
Duplicated keys are almost never covered if they're damaged after you leave the shop. Bent keys, stripped teeth from forcing, or keys snapped off in the lock fall on you. Some services also exclude high-security or restricted keys, which require specific manufacturer authorization to duplicate—if a key cutter produces an unauthorized duplicate and it fails, they may not honor a replacement.
Residential and business keys duplicated from keys that are already worn or damaged may also fall outside warranty terms. If your original key is partially stripped or bent, the duplicate will copy those flaws. A professional will flag this and recommend getting a fresh key from your lock or manufacturer instead.
Guarantees on Accuracy and Fit
When a key cutter guarantees a duplicate will work, they're backing it against poor calibration or operator error. Typical accuracy is within 0.1 to 0.2 millimeters. Most shops stand behind this with a same-day re-cut at no charge. If you discover the key doesn't work a week later, you'll likely need to pay again—the guarantee period ends when you leave.
Some locksmiths and hardware stores offer extended assurances on higher-ticket duplications, like rekeying services or master key systems, but straight key copies rarely include guarantees beyond 60 days. If you're duplicating a critical key (vehicle, safe, or commercial), ask upfront what happens if the copy fails after 48 hours.
Price, Quality, and Warranty Trade-Offs
Budget key cutting at big-box retailers ($1–$3 per key) typically includes minimal or no warranty—if it doesn't work, you get a replacement, but no refund or credits toward lock service. Mid-range locksmiths ($4–$8 per key) usually offer 30-90 day defect warranties. Premium locksmith shops ($8–$15+ per key) often include lifetime replacement guarantees on blanks, though labor for re-cuts may apply.
Security keys and specialty blanks carry different warranty rules. A laser-cut car key or restricted blank might cost $15–$50 but come with manufacturer restrictions on who can duplicate them legally. If a shop produces an illegal duplicate, you won't have recourse under their warranty.
How to Protect Yourself
- Request the guarantee in writing. Even a brief email confirming the warranty terms beats a verbal promise.
- Test the key immediately before leaving the premises. Most shops will fix it on the spot for free.
- Keep your receipt. It's proof of when you had the work done and establishes the warranty start date.
- Ask about the original key's condition. If the cutter warns it's worn, listen. A bad original produces a bad duplicate.
- Clarify what "defect" means. Does it cover sticking, or only complete failure?
Finding a reliable key duplication provider with transparent warranty policies matters—especially for critical locks. Platforms like Mercoly let you compare key cutting and duplication providers in your area, read real reviews, and see their warranty policies side-by-side before committing.
Frequently Asked Questions
Q: If a duplicated key breaks inside my lock, is the locksmith liable? No—once you take possession of a key, damage from use is your responsibility. The locksmith's warranty covers manufacturing defects, not breakage from normal wear or mishandling.
Q: Can I get a refund if a duplicated key doesn't work after three days? Unlikely. Most warranties only cover defects discovered immediately after duplication; they don't extend to later failures. If the key worked when you tested it in the shop, the cutter's obligation typically ends.
Q: Are high-security keys covered by the same warranties as standard house keys? Not always. High-security keys may have legal or licensing restrictions, and some shops exclude them from standard warranties. Always confirm coverage before ordering a restricted key duplicate.
Use Mercoly to find trusted key cutting providers in your area and compare their warranty terms directly.