Moving into a new home in the Bay Area is exciting — and it's also the single most important moment to take control of your home's security. Before that first box is unpacked, ask yourself one question: who else has a key to this house? The honest answer is usually "I have no idea." Previous owners, their relatives, real estate agents, contractors, dog walkers, house cleaners and neighbors could all be holding a working key. The fix is simple, but it comes in two flavors: rekeying or replacing your locks. This guide explains the difference, what each option costs, and how to decide.
What does it mean to rekey a lock?
Rekeying changes the internal pin configuration of a lock so it works with a brand-new key — and the old keys stop working entirely. Your locksmith removes the lock cylinder, swaps out the small pins inside to match a new key cut, and reassembles it. The hardware on your door stays exactly the same; only the key that operates it changes.
Rekeying is fast (usually just a few minutes per lock), affordable, and instantly voids every key that existed before. For most people moving into a home, it's the perfect solution.
What does it mean to replace a lock?
Replacing a lock means removing the existing hardware entirely and installing a brand-new lock. You get new hardware, a new finish, and new keys. Replacement makes sense when:
- Your existing locks are worn, corroded or damaged and no longer operate smoothly.
- You want to upgrade security — for example, moving from a basic knob lock to a grade-rated deadbolt or a high-security cylinder.
- You're switching to smart locks or keypad entry.
- Your locks are simply old and dated, and you want a fresh look to match a renovation.
Rekey vs. replace: how to decide
Here's the quick decision framework we give our Bay Area customers:
Choose rekeying if:
- You just moved in and the locks are in good working order.
- You lost a key and want to void it without buying new hardware.
- A tenant, roommate or employee moved out.
- You want every door to open with a single key (this is called "keying alike").
Choose replacement if:
- The lock is broken, stiff, rusty or unreliable.
- You want a security upgrade or a different style.
- You're adding a deadbolt to a door that never had one.
- You want smart or keyless entry.
In many homes, the smartest approach is a combination: rekey the good locks, replace the worn ones, and key everything alike so you carry one convenient key.
What about "keyed alike"?
One of the most underrated benefits of rekeying is the ability to make several locks open with the same key. If your home has a front door, back door, side gate and garage entry — each with its own key — a locksmith can rekey them all to a single key. No more fumbling through a crowded key ring in the dark. It's a small change that makes daily life noticeably easier.
How much does it cost?
Pricing varies by the number of locks and the hardware involved, but as a general rule:
- Rekeying is priced per cylinder and is significantly cheaper than replacement, because you keep your existing hardware.
- Replacement costs more because you're paying for new locks, but you get upgraded security and a fresh finish.
The best approach is to get an upfront quote before any work begins. At Bay Area Lock And Key, we quote a clear price for every job — rekey or replace — so there are no surprises. We'll also give you an honest recommendation: if rekeying will serve you just as well as replacement, we'll tell you, because it saves you money.
Don't forget these commonly overlooked entry points
When homeowners think about security, they picture the front door. But burglars look for the easiest way in, which is often somewhere else entirely. Make sure you also address:
- Back and side doors, which are frequently less secure than the front.
- Garage entry doors leading into the home.
- Sliding doors and French doors, which need proper locks.
- Gates and mailboxes, which often come with lost or copied keys.
When to upgrade to high-security or smart locks
If you're already having a locksmith out, it can be worth upgrading at the same time. Two popular upgrades:
High-security locks resist picking, bumping and drilling, and use patented keys that can't be copied at a hardware store without your authorization. They're ideal for exterior doors and anyone who wants maximum protection and key control.
Smart locks let you unlock with a code, phone or fingerprint, issue temporary access to guests or service providers, and check whether the door is locked from your phone. They're especially handy for busy families and rental properties.
The bottom line for Bay Area homeowners
If you've just moved into a home — or you've lost a key, ended a lease, or finished a remodel where contractors held keys — rekeying is almost always the right first move. It's fast, affordable, and it instantly locks out everyone who might have an old key. Replace locks when they're worn or when you want to upgrade, and consider keying everything alike for daily convenience.
Whatever you choose, don't put it off. Controlling who can enter your home is the foundation of home security, and it's one of the easiest wins there is.
Need help deciding? Bay Area Lock And Key offers same-day rekeying and lock replacement across the entire Bay Area, with upfront pricing and honest recommendations. Call (669) 228-8289 and we'll get your new home secured today.