In this guide
What does keyed alike mean?
Imagine a front door, back door and side gate, each currently using a different key. If suitable locks can be keyed alike, one working key can operate those included locks. You can still have several copies for household members; the aim is fewer different keys, not a single physical key.
It does not mean every lock sold by the same brand accepts the same key. Nor does a similar key shape establish compatibility. The actual cylinder and key system need checking.
How is that different from a master-key system?
These arrangements solve different access problems. With keyed-alike locks, the shared key operates the included locks. In a master-key system, individual keys can operate their assigned locks while a master key operates a defined group.
Scroll across the table to see every column. →
| Arrangement | Typical purpose | Question to ask |
|---|---|---|
| Keyed differently | Keep access to individual locks separate | Who needs a key to each entrance? |
| Keyed alike | Reduce different keys for included locks | Which doors should every holder of this key be able to open? |
| Master keyed | Provide different levels or groups of access | Which individual keys and management keys are required? |
Keyed differently
Arrangement
- Typical purpose
- Keep access to individual locks separate
- Question to ask
- Who needs a key to each entrance?
Keyed alike
Arrangement
- Typical purpose
- Reduce different keys for included locks
- Question to ask
- Which doors should every holder of this key be able to open?
Master keyed
Arrangement
- Typical purpose
- Provide different levels or groups of access
- Question to ask
- Which individual keys and management keys are required?
A household wanting fewer keys may only need a keyed-alike arrangement. A workplace with separate rooms and different users may need a more detailed access plan. Start with who should enter where before choosing a system.
Which existing locks can be included?
Make a list of the doors and send clear photos of the hardware. A locksmith can assess whether existing cylinders are compatible, whether they can be rekeyed and whether their condition makes keeping them worthwhile.
Some arrangements can retain suitable hardware; others need different cylinders or locks. A gate, screen door or padlock may use a different system from the main entry. Ask which items are covered by the proposal rather than expecting one key to work everywhere.
Our rekeying overview explains changing key access on compatible locks. The rekey or replace guide covers the separate question of retaining or changing hardware.
Consider the convenience and the access trade-off
One shared key is easier to identify and carry. It also gives each holder access to every lock included in that arrangement. If a gardener only needs the side gate, consider whether that gate should remain separate from the house doors.
If the shared key goes missing, review all the locks it operates, not just the entrance where it was last used. Discuss how access would be changed and what work would be involved. Convenience should follow your access plan.
Prepare a clear enquiry
Include the number of locks, which doors should share access, the keys you currently hold and any unreliable hardware. Ask whether the quote covers assessment, cylinder or lock changes, fitting and the agreed number of keys. For a business with different access groups, discuss those needs as part of a commercial lock enquiry. Our pricing checklist explains what to confirm in the quote.
Common questions
No. Compatibility depends on the specific system. A brand name alone is not enough to confirm it.
It describes the key arrangement. Hardware suitability, condition and installation still need considering separately.
Ask the building manager first. Shared or restricted systems may have managed permissions and technical limits that prevent combining them with private locks.
Want fewer different keys? List the doors you would like to include.