Home lock calculator
Home Lock Change Quantity Planner
Count home entry points to review when moving or changing access.
Result
Formula
Calculation logicOne door may have more than one lock or cylinder. Count the hardware you actually plan to change.
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.
Budgeting and Scheduling a Lock Project
Build the budget in three bands
Parts = locks times tier price. Labor runs $0 DIY, ~$160 scheduled, ~$340 emergency. Add a prep-risk adder for painted, misaligned, or odd-bore doors, then hold 30% above base for surprises.
Schedule the work in order
Remove and inspect, fix prep, install, align the strike, test ten cycles, then do smart setup last. First-time DIY takes about twice a pro. Demand a ten-cycle test and haul-away before paying.
Verify before you buy
- Walk every entry with the phone camera
- Count cylinders, not just doors
- Order spares before the visit