After a move, rekeying changes the working key arrangement, while replacement changes some or all of the lock hardware.
A ring of keys from the previous occupant does not explain every cylinder in the new space. Start with a door-by-door check. Identify which key operates each lock and which entrances belong to the unit rather than the building.
Is the existing hardware working as intended?
Try each known key gently with the door open, then note how the bolt lines up when the door closes. A cylinder that turns while the door is open but binds when it is shut may be dealing with alignment rather than a key problem.
Look for loose handles, dragging edges, and a latch that misses its strike. Rekeying changes the cylinder's internal key arrangement; it does not raise a sagging door or adjust a closer.
When does rekeying fit the job?
A compatible cylinder in working condition may be rekeyed by resetting its pins for another key. The previous key then no longer operates that cylinder. Much of the surrounding hardware can stay where it is.
If several doors should share one key, their keyways and cylinder types must be compatible. Do not assume that matching handle finishes mean matching key systems.
When should replacement be considered?
Replacement belongs in the discussion when a cylinder is worn, a lock body is broken, or you want a different hardware arrangement. Measurements matter, including door thickness, existing holes, and the position of the strike.
- Make a simple inventory of unit doors and their locks.
- Separate shared building keys from individual unit keys.
- Decide who needs access to each room or entrance.
- Confirm permission before changing rented or shared hardware.
- Keep door alignment issues separate from key changes.
For a keypad, moving in also raises a settings question: who controls the existing codes? Mechanical rekeying does not change electronic credentials or building fobs.
Common questions
Can I keep the same handle after a rekey?
Often the handle remains because the work is inside a compatible cylinder, but the lock's construction determines what can be retained.
Should every entrance use one key?
That depends on how the space is used. Separate keys may suit rooms or entrances assigned to different people.
What should a tenant settle before changing hardware?
Clarify permission and building requirements with the owner or manager, especially where a door serves shared access or uses building-managed hardware.