Key Duplication: What Can Be Copied and What Requires Authorization
Key duplication depends on more than having a cutting machine. The original key, blank availability, keyway restrictions and electronic components determine what is possible.
Use the best available original
A duplicate follows the information in the source key. A bent or heavily worn copy can pass its errors to the next key. When possible, use a clean original or decode the lock rather than repeatedly copying a poor duplicate.
Standard house keys
Many common residential keys can be copied when the correct blank is available. Test the new key without force. If both old and new keys bind, the lock or door alignment may need attention.
Restricted key systems
A protected keyway may require an authorization card, identification, signature or service by an authorized dealer. Property managers and employers may also control duplication even when the key itself is not patent-restricted.
Car keys include electronics
A blade can operate a door or ignition while the immobilizer still rejects the vehicle start. Transponder, remote and smart keys require a compatibility check and may need programming.
Compare residential keys with vehicle key duplication.