Rekeying versus replacing
Rekeying changes which key operates a lock without replacing the lock itself. A locksmith removes the cylinder, takes out the small pins inside, and installs new pins that match a new key. The old keys stop working. Rekeying is usually less expensive than replacing locks, and it lets you keep hardware that's in good condition and matches your doors.
Replacement makes more sense when the lock is worn, damaged, low quality, or when you want better security or a different style, such as moving to a smart lock or a higher-grade deadbolt.
When to rekey
- After moving into a home. You don't know how many copies of the old keys exist or who has them: previous owners, contractors, neighbors, real estate agents.
- After losing keys, especially if they were with something that identifies your address.
- After a breakup, roommate change or end of a tenancy.
- After firing a housekeeper, contractor or anyone else who had a key.
- When you want one key for every door. Locks of the same brand and keyway can usually be rekeyed to work with a single key ("keyed alike").
Keying alike
Many homes end up with different keys for the front door, back door, garage entry and side gate. If the locks share a compatible keyway, a locksmith can rekey them to one key. If they don't, replacing one or two cylinders with a compatible brand can make it possible. Ask the locksmith to check before you buy new hardware.
Master key systems
For rental properties, small businesses and some multi-unit buildings, a master key system lets each lock have its own key while a master key opens all of them. These systems need careful planning and record-keeping. A locksmith can design one and explain how keys are controlled.
High-security and restricted keys
Some cylinders use restricted keyways, where duplicate keys can be cut only by authorized dealers with proper authorization. They also tend to resist picking, bumping and other manipulation better than standard cylinders. They cost more, but they give you more control over who has copies.
What a rekeying visit includes
1. Checking each lock's condition and brand. 2. Removing cylinders and replacing pins to match new keys. 3. Testing every lock with the new keys. 4. Cutting the number of keys you need. 5. Advice on any locks that are worn or weak and should be replaced.
Lock maintenance
Locks last longer with a little care. If a key becomes hard to turn, use a lubricant recommended for locks, such as a dry graphite or a product made for lock cylinders, rather than oil, which attracts dust. A deadbolt that's hard to throw is often a door alignment problem rather than a lock problem; the bolt is rubbing against the strike plate. Adjusting the strike or the door's hinges fixes it and protects the lock.
Questions to ask
- Can these locks be rekeyed, or should any be replaced?
- Can you key all my exterior locks alike?
- What's the price per cylinder and for extra keys?
- Do you recommend restricted keys for my situation?
- Do you guarantee the work?
Rentals
Landlords should rekey between tenants and keep a log of which keys were issued. Keypad or smart locks can make that easier, because codes can be changed without a service call.