Do I Need to Rekey After Buying a House?

Neighbors Ask

The short answer, said over the fence

Nothing makes you rekey after buying a house, but most locksmiths, and most thoughtful neighbors, will tell you it is worth doing. The reason is simple and not at all sinister: you do not know how many keys to that house exist. The sellers had some. Maybe the previous owners had some. A cleaner, a contractor, a relative, a real estate agent and a dog walker may have held copies at one time or another.

Rekeying changes the inside of the lock so the old keys stop working and a new key takes over. The door, the lock body and the handle all stay in place. What changes is the pattern of pins in the cylinder. It is a modest, tidy job, and it turns an unknown list of key holders into a known one, which is the whole point. Many new owners tell themselves they will get to it later, then notice months on that they are still carrying keys to a house whose key history they have never learned.

Think of buying a used car where you have no idea who else holds a spare. You would want the locks reset. A house is the same, only more personal. This page walks through when rekeying makes sense, what it involves and how it compares with replacing the hardware.

Why the old keys are an unknown

Sellers rarely keep a ledger of every key they ever handed out. Over the years, a key might have gone to a babysitter, a house sitter, a roofer, an adult child who moved out or a friend who watered the plants. Some of those keys came back, some were copied, and some just disappeared into a drawer in someone else's kitchen.

None of this means anyone plans to misuse a key. Most of the time, no one does. But a key that exists in unknown hands is a loose end, and loose ends are exactly what a new owner wants to tie up. Rekeying is a small job next to a lifetime of wondering, and a far smaller one than the stress of a real problem.

There is also the matter of keys in the sale itself. Lockboxes, showing keys and temporary keys given to inspectors or appraisers may have been in circulation during the sale. Our guide on lockboxes and showings explains how those work in general terms. Whoever held access during the sale probably did so for good reasons, but their access should end when the sale does.

What rekeying actually does

Inside a typical house lock cylinder are small spring loaded pin stacks. Each stack is made of a driver pin and one or more key pins of different lengths. The key lifts every stack to the shear line, which is the gap that lets the cylinder turn. Change the lengths of the key pins and a different key will be needed to line things up.

That is rekeying. The technician removes the cylinder, takes out the old pins, installs new ones that match a fresh key, and puts everything back together. You end up with the same lock but a different key, and you also keep the original look of the door, which matters if the house has character you want to preserve. The old keys still slide in but no longer turn. It is a bit like changing the combination on a safe without replacing the safe.

Because it reuses your existing hardware, rekeying is often a gentler choice than replacing locks. You keep your handles, deadbolts and finish. If you want to learn more, our rekey your home page describes the service, and the guide on whether it is better to rekey or replace compares the paths.

When rekeying is not enough

Rekeying assumes the hardware is in decent shape. If a lock is badly worn, damaged or poorly made, a fresh set of pins will not cure it. A deadbolt that sticks, a knob that wobbles or a latch that does not catch is better replaced than rekeyed. A technician can tell you which you have after a short look. A useful test you can try yourself is to turn each key slowly and feel for grit or catching. A smooth, steady turn suggests a healthy lock, while a gritty or sticky feel hints at wear that rekeying will not repair.

Some homes also have a mismatch of hardware. Perhaps the front door has a sturdy deadbolt, the back door has only a knob, and a side door has a lock from a different decade. When you move in, it is a good time to look at the whole set and decide what, if anything, needs upgrading. Our guide on whether every exterior door needs a deadbolt helps frame that choice.

And rekeying does not address everything. It will not fix a sagging door, a loose frame or a window that does not latch. It deals with keys, not the structure around them. A walk around the house with a clear eye, perhaps with a technician, shows what else deserves attention. Check the strike plates, the screws on the hinges and whether each door closes without rubbing. Those small things decide how well the locks can do their work.

What else has keys: the forgotten list

Front and back doors are the obvious ones. But a house can have many more locks than people count. There may be a garage entry door, a side gate, a shed, a mailbox, a window latch, a sliding door lock, a basement door or a storage room. Each of those might be keyed differently, and each might have its own set of old keys floating around.

A good approach is to walk the property with a notepad. List every lock and note whether it is keyed. Then decide which ones matter. Exterior doors generally deserve attention first. Sheds and gates are worth thinking about, especially if tools or vehicles are stored there. Our guide on mailbox lock questions covers one that people often overlook.

Also think about garage door openers and keypads. Those are not keyed in the same sense, but they hold codes the previous owner may know. Resetting codes on keypads and openers is simple and often forgotten. A thorough new owner includes them in the list, not just the metal keys. The same goes for any shared accounts connected to doorbells or cameras, which sometimes stay linked to a previous owner's phone until someone resets them.

Rekey, replace or leave alone

There are three honest choices. Leave the locks alone and accept the unknown. Rekey the existing locks. Or replace the hardware entirely. Leaving things alone is the least effort in the moment and the least comfortable over time. Rekeying is the middle path for most people. Replacement makes sense when you want a different style or the old hardware is tired.

A useful question is what problem you are solving. If it is the worry about unknown keys, rekey. If it is damaged or worn hardware, replace. If it is style, that is replacement as a design choice. Our guide on how to tell if your locks are worn out can help decide.

Sometimes a mix works well. You might rekey the sturdy front deadbolt and replace a tired back door knob in the same visit. A technician with a service van, tools and common hardware can often do both without a second trip. Bring your list of every door and gate, including the odd ones, so nothing is left for another day. It is worth mentioning everything you notice so the plan covers it.

Timing: when to do it

The ideal moment is early, before you start moving valuables in. Many people schedule rekeying around the day they get the keys, or the first few days of ownership. Doing it before the movers arrive means you never have a period where unknown keys can open a house full of your belongings.

That said, it is not a race. If you are not ready at closing, do it within the first stretch of ownership while the house is still fresh in your mind. The key point is not to let it drift for months because it never feels urgent. Urgency only arrives after something goes wrong, and by then the choice has been made for you. A calm decision in the first days of ownership is always more comfortable than a hurried one at an awkward hour.

If you are buying a house that is vacant or has had many visitors, such as a rental or a property that was shown often, rekeying becomes more sensible. If the house was occupied by a single owner who handed over every key, you may feel less pressure. Either way, the choice is yours.

What to expect when we come

When you contact us, tell us how many locks you want looked at and what kind they are. A technician arrives in a branded service van with the tools needed to rekey on site. We examine each lock, confirm it is in good shape, and discuss whether rekeying or replacing makes sense. Then we do the work and test every key.

You will receive new keys that match your locks. We suggest asking for enough keys for each member of the household, plus a spare for a trusted person. We can also arrange the locks so one key opens several doors, which keeps your key ring tidy. Our guide on how many keys a household should keep offers a sensible approach.

The work happens at your door, and you can watch if you like. We explain what we are doing and why. If something unexpected shows up, such as a damaged cylinder or a lock that cannot be rekeyed, we tell you and discuss options. There are no surprises that you hear about only at the end. You will also get a short reminder, in plain words, about which key opens which lock, so the new ring does not become a puzzle.

Old houses, new owners, odd locks

Not all locks rekey the same way. Many common house locks do, but some older or specialty hardware needs different handling. Mortise locks in older houses can often be rekeyed, though they may need a more careful approach. Very old or unusual locks may be better replaced with something new that fits the door.

Smart locks and keypad locks are a different story. They may not use pins at all, and changing access means changing codes or credentials. If your new house has such hardware, ask for the manuals and reset every code you can. Our guide on whether smart locks can be rekeyed explains the difference.

If the home has a lockbox or a stored key box from the sale, remove it and make sure any keys inside are accounted for. Ask the sellers whether any keys remain in circulation, but do not rely on the answer alone. People forget, and even careful owners lose track of a copy given years ago to a friend who has since moved away. Politeness is fine, but a rekey does not depend on anyone's memory. A rekey is the dependable way to start fresh.

Tenants, landlords and shared homes

Everything above assumes you own the place. If you are renting, the rules are different, and who may change locks depends on your lease and local rules, which vary. Ask your landlord or property manager what is allowed before touching anything. Our guide on what renters should ask a landlord about lock changes covers the questions.

If you are buying a home within an association or a community with rules about exterior hardware, check those rules first. Our note on association questions about exterior door hardware raises the points worth asking. We do not state what the rules are, because they vary.

If you are buying a property to rent out, think about how keys will move between tenants. Our guide on the rekey at turnover workflow shows a tidy way to manage it. Starting with a clean key slate is a gift to your future self, and to whoever lives in the house after you.

Getting it done

To arrange a rekey, tell us how many locks and what type, and we will talk through the plan. Because our phone line is marked coming soon, please use the request form on our contact page. We do not publish prices on these pages, and we will discuss the work before starting.

If you are still choosing, our guide to what to have ready will make the conversation smoother. If you are in the Scott Valley, our home lock service in Etna page explains how we work with local homes.

Buying a house is full of decisions, and the lock question is one of the easier ones to settle. Between inspections, paperwork and boxes, it is easy to push it down the list, so consider putting it on the calendar the day you get the keys. Future you, lying awake in a quiet new house, will be grateful. A fresh set of keys, a short list of who holds them and a night of sleeping soundly in your new home is a very good return for an ordinary afternoon.

Good to know

Common questions