Rekeying vs. Changing Locks: Which One Do You Need?
If your locks work fine and you're only worried about who else has a key, rekey them. Rekeying changes which key operates the lock while the hardware stays on the door, typically $20-$40 per lock plus a trip fee. Replacing the whole lock costs more, solves a different problem, and is needed less often than most invoices suggest.
What rekeying actually does
Most American house locks are pin tumbler locks. Inside the cylinder sits a row of tiny pins that match the cuts on your key. A locksmith pulls the cylinder, swaps those pins for a set matched to a new key, and reassembles it. Ten minutes per lock for someone who does it every day. Your old keys die instantly. The deadbolt itself stays put, same hole, same finish.
A rekey is also how you get one key for the whole house. If your front door, back door, and garage entry use the same brand of lock, a locksmith can pin all of them to a single key. For anyone carrying a key ring that jingles like a janitor's, that alone is worth the trip fee.
What each job costs
Rekeying typically runs $20-$40 per lock, plus a service call fee that usually lands around $30-$100. Four locks might come in near $200 all in. Replacement is the price of new hardware plus the labor to install it, and the hardware is where the money goes. A quality deadbolt costs several times what a rekey does, and multiplying that across four or five doors adds up fast. If the existing hardware is in good shape, the extra spend buys you nothing a rekey wouldn't.
When a rekey is the right call
Rekey when the locks are healthy and the real problem is who might hold a key:
- You just bought or moved into a home. Previous owners, agents, cleaners, and contractors may all have copies. It's the first item on our new home lock checklist.
- You lost a key, or one was stolen with your address attached.
- A roommate or an ex moved out and you can't be sure every copy came back.
- You're a landlord turning over a rental. We cover what Florida expects in our guide to landlord and tenant lock changes.
- You want one key for every door instead of a full pocket.
When replacement earns its price
Buy new locks when the hardware itself is the problem:
- The lock is worn out. If the key sticks, needs a jiggle, or the bolt grinds halfway, new pins won't save a dying mechanism.
- You're upgrading security. Builder-grade knobs give up quickly compared with a Grade 1 deadbolt and a reinforced strike plate.
- You want a keypad or smart lock. That's new hardware by definition. We weighed the tradeoffs in smart locks vs. deadbolts.
- Someone attacked the door. After a break-in attempt, a lock can look fine outside and be bent inside.
The upsell to watch for
Plenty of people pay for new locks when a rekey would do. It's one of the most common soft upsells in the trade, and it works because most customers don't know rekeying exists. A tech who quotes full replacement for every door without looking at your hardware is quoting for his own benefit.
The defense is one question: can these locks be rekeyed instead? An honest locksmith will answer straight, since either job pays them. Before you call anyone, walk your doors and test every lock with its key. If the keys turn smoothly and the bolts throw all the way into the frame, ask for the rekey price first, and make whoever shows up explain why you'd need anything more.
