Rekey vs Replace Locks: Which Is Better and When?

When your key goes missing, you move into a new home, or someone you no longer trust has a copy, you face a simple but critical choice: rekey locks, the process of changing the internal pins so only new keys work, or replace locks, removing the entire lock mechanism and installing a brand-new one. Both fix security issues, but they’re not the same. Rekeying is cheaper and faster—it keeps your existing hardware and just resets the lock’s internal code. Replacing locks means buying new hardware, which costs more but gives you a fresh, modern lock with updated features like pick-resistant cylinders or smart compatibility.

Most people don’t realize that a locksmith, a trained professional who works on locks, keys, and security systems can rekey most standard residential locks in under 30 minutes for a fraction of the price of replacement. If your lock is old, damaged, or from a brand that’s no longer made, replacement is the only smart move. But if it’s a decent quality lock—like a Yale, Kwikset, or Schlage—that’s still in good shape, rekeying makes sense. Think of it like changing the password on your phone instead of buying a new one. You keep the device, but only you can access it. In India, where many homes use imported or locally made locks with standard pin tumbler designs, rekeying is a common and trusted practice. It’s also the go-to for landlords changing tenants or businesses updating access after an employee leaves.

There’s one big trap: if you’ve lost your only key and don’t have a spare, rekeying might not be possible without removing the lock first. In that case, you’re basically replacing it anyway—just paying for the labor to remove the old one. Also, if your lock has visible wear, rust, or doesn’t turn smoothly, rekeying won’t fix those problems. A worn-out lock is like a worn-out tire—no matter how good the new key is, the system is failing. That’s when replacement wins. New locks often come with better security ratings, anti-bump features, and sometimes even digital options. If you’re upgrading your home security, replacing locks gives you a chance to add deadbolts, smart locks, or keyless entry systems that rekeying can’t touch.

Cost-wise, rekeying usually runs between ₹500 and ₹1,500 per lock in India, depending on the brand and location. Replacing a single lock can cost ₹1,500 to ₹4,000, including the new hardware. For a whole house with five doors, that’s a big difference. But here’s the catch: if you’re replacing one lock because it’s broken, you might as well replace them all. Mismatched locks look bad and are harder to manage. You don’t want one modern smart lock on the front door and a 20-year-old cylinder on the back. Consistency matters for both security and convenience.

So how do you decide? Ask yourself: Is the lock physically okay? Do you have a spare key? Are you okay with the same lock design? If yes to all three, rekey. If any answer is no, replace. And if you’re unsure, get a local locksmith to inspect it—most offer free estimates. This isn’t just about saving money. It’s about making sure your home or office stays safe without overpaying for something you don’t need. Below, you’ll find real examples and expert advice on when rekeying works, when replacement is the only option, and how to avoid common mistakes that leave you vulnerable—or out of pocket.