Key duplication sounds simple — slide the key in, press a button, done. But the reality is more nuanced. Some keys can't be copied at all, others require specialized equipment, and copy quality varies significantly depending on where you go.
Most standard brass house keys (Kwikset, Schlage, Master) can be duplicated at any hardware store, locksmith, or kiosk. The key to quality: use an experienced locksmith over a vending machine for precise cutting, especially for worn keys that need to be cut from spec rather than traced.
Keys stamped 'Do Not Duplicate' or 'Restricted' use patented keyways that can only be copied by authorized dealers. This includes Medeco, Mul-T-Lock, ASSA Abloy systems. A licensed locksmith who is an authorized dealer can make copies with proper authorization.
Car keys made after 1995 usually contain an RFID chip that must be programmed to the vehicle. Cutting the key is only half the job — the chip must also be programmed. Hardware stores can cut the key blank but cannot program the chip. A qualified automotive locksmith handles both.
Key fobs and proximity keys don't have a blade to cut — they communicate electronically with the vehicle. 'Duplication' involves programming a new fob to the car's system. This requires specialized programming equipment available at dealerships and automotive locksmiths.
Many high-security padlocks (Master Lock Pro Series, ABUS) use patented keyways with restricted duplication. Copies require the original card or code issued with the lock. Attempting to copy through a standard kiosk produces a key that won't work.
Hardware store kiosks: fine for simple standard keys. Big-box stores: similar quality to kiosks. Locksmith: best for worn keys, restricted keys, transponder keys, and high-volume jobs. Always test a copied key before relying on it.