Home lock calculator
Rekey vs. Replace Decision Tool
Choose a practical next step when a key is missing or a lock needs attention.
Result
New-cylinder adder if mixed (USD)
—
Rekey estimate (USD)
—
Replace estimate (USD)
—
Rekey savings vs replace (USD)
—
—
Formula
Calculation logicA locksmith or manufacturer should confirm whether your existing cylinder can be rekeyed.
Rekey, Keyed-Alike, and Key Control
Rekey beats replace when hardware is sound
Rekeying (~$25 per cylinder) wins whenever the lock operates smoothly and cylinders share a keyway. Replace the full set when hardware is damaged, forced, or corroded, and replace cylinders first when brands are mixed.
Run two key groups at most
One shared key for convenience areas, one restricted key for rentals, offices, and utility rooms. Lost keys and tenant turnover force an immediate rekey before new copies go out. Log every key by person and date; collect all copies on move-out.
Verify before you buy
- Test every lock for grit or looseness
- Photograph cylinder brands
- Rekey before cutting new copies