How much does it cost to rekey a lock?

Locksmiths might charge $1 to $4 to copy a key, but it might up to $3 to $20 for special keys. To rekey your door, there will be a minimum fee of $40 to $100 plus $5 to $25 per lock cylinder. Rekeying doesn’t mean replacing your locks. They rearrange the pins in the cylinder to make an old key not work.