Rekey or replace? How to decide after losing your keys

What rekeying actually does

A locksmith removes the cylinder, changes the pin configuration inside it, and cuts new keys to match. The lock body, handle and strike stay exactly where they are. Old keys stop working permanently.

Rekeying is usually enough when

• The hardware is in good mechanical condition and turns smoothly
• You've lost a key, ended a share house, or taken over a property
• You want several doors running off one key
• The lock still meets whatever standard your insurer specifies

Replace instead when

• The cylinder is worn, gritty, or the key has to be jiggled
• The lock is a low-grade builder's special on a main entry door
• Parts are discontinued and cannot be sourced
• You're upgrading to a restricted key system for real key control

A note on cost

Rekeying several cylinders in one visit is far cheaper per door than separate callouts. If you know you'll want the whole house keyed alike, say so up front rather than booking twice.