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Transponder car keys have complex electronic components that need professional programming to synch with your car's computer. The technology serves as an anti-theft measure, making unauthorized duplication difficult. The higher price—typically between $50 and $175—reflects both the advanced components in the key and the specialized equipment and training needed to program it correctly.

Yes, but the process becomes more complex and expensive without an original key to duplicate. A professional locksmith can create a new key by examining your lock directly, either by making an impression or disassembling it to determine the correct key pattern. For vehicles, a dealership may be able to create a key using your vehicle identification number, though you'll need to provide proof of ownership. Both methods cost significantly more than standard duplication of an existing key.

Copying a standard house key is remarkably quick at most retail locations. The entire process typically takes between 2-5 minutes from the time you hand over your original key. The key-cutting machine uses your existing key as a template to precisely cut the new blank. If there's a line or you're ordering multiple copies, you might wait a bit longer, but the actual cutting process remains efficient for basic keys.

Keys marked "do not duplicate" may still be copied, but with restrictions. Many hardware stores will refuse to copy these keys as a matter of policy. However, with proper identification and proof of ownership, a professional locksmith can often make a copy. High-security keys with this marking may require authorization from the lock manufacturer or property manager. These restrictions exist to maintain security by preventing unauthorized access.

For most homeowners, buying a key duplicator isn't cost-effective. A basic machine costs approximately $500, which would require duplicating hundreds of keys to recoup your investment. Beyond the initial machine purchase, you'd need to acquire key blanks, a vice (costing $10 to $25), and files ($5 to $10). Unless you plan to start a key-cutting business or have an unusual need for frequent key duplication, using professional services remains the more practical option.