Rekey or replace locks on every exterior door as soon as you get the keys. Rekeying swaps the pins so old keys stop working, and it costs less than new hardware. A single-lock kit runs about $12 to $25. Replace a lock instead if it's worn or damaged, or you have mixed brands.

Owners say to book the locksmith for closing day or show up with new locks and a drill. One had a locksmith there an hour after closing. A seller in one thread admitted their son had lost his key five times and they had given copies to about six pet sitters, so assume keys are scattered around the neighborhood. (Reddit)
Price it before you call a locksmith. One owner paid over $150 for a house call. Others rekeyed four locks in about an hour with a roughly $15 pin kit, or took the cylinders to a hardware store counter that rekeys them. Some say new $30 locksets cost about the same as a locksmith visit. (Reddit)
Where owners disagree: Most owners say anyone can rekey or swap locks and you don't need a pro. One owner disagrees from experience: their first try left a door that wouldn't lock, the second left one that wouldn't close, and they had no signal to pull up a video. A locksmith fixed it and can install a reinforced strike plate in the same visit. If you're not handy, budget for the locksmith. (Reddit)
How to do it
- Count your locks
- Decide rekey or replace
- Choose who does it
- Rekey the cylinders
- Test every key in every lock
- Reset digital access
- Clear out hidden keys
Buying guides for this task: Lock rekey kits, Smart locks, Deadbolts
Sources: Bob Vila, independencemo.gov, irvinepd.gov
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