A Spare Key Now Versus a Spare Key Later

Everyone eventually ends up with a second key. The only question is whether you get there on a calm Tuesday with a working key in your hand, or on a cold evening with nothing to copy from. The destination is the same, but the road is very different.

When a working key exists, a locksmith can duplicate it, check that it turns smoothly and send you on your way. When none exists, the job grows. The lock may have to be read, a key code may have to be looked up, and a vehicle may need its electronics taught to accept a new key.

This note compares both roads honestly so you can decide when it makes sense for your keys, your vehicles and your doors.

Think of it like a spare tire. Nobody enjoys buying one, and nobody who has needed one regrets having it. The cost of a spare key is mostly a small amount of attention, spent while nothing is going wrong.

There is also a quiet benefit in having two keys that behave the same. If one starts to feel different, you notice the difference, and that is often the first hint that a lock or a key needs a closer look.

Duplicating a metal house key is mechanical. A blank of the same shape is clamped next to your original, and a cutting wheel follows the original's valleys and peaks while carving the blank. The result should be a near mirror of the first key, as long as the original is in good shape.

That last phrase matters. A key worn by years of use has rounded edges, and a copy of a worn key inherits the wear. Sometimes the copy is a little less crisp, and a lock that was already stiff may balk. Our note on why duplicate keys sometimes fail explains the causes.

A technician who cuts keys by code, rather than tracing a worn one, can often give you a cleaner result. Ask about it when your original is old.

Cutting by code is a second method. Many keys are made to a published pattern identified by a short code. A technician who knows the code can cut a clean key without tracing anything, which is useful when the original is worn or when you only have a record of the code.

Quality varies between machines and operators. A careful technician checks the copy in the lock before handing it over, turns it several times and listens for any grit or drag. Ask them to do this in front of you.

If you are curious how a cut becomes a working key, our note on keyways and key blanks explains why a blank has to match the lock's profile before any cutting begins, and why a key that looks right can still refuse to enter.

A modern car key is two things in one. The blade turns the lock cylinders, and the transponder chip inside the head sends a coded answer to the vehicle. Without the right code, the engine may crank but never run. Making a spare means cutting the blade and teaching the car the new chip.

With a working key, this is often a straightforward programming session. With no working key, the process can still be done, but it asks more of the equipment and of the technician, and it asks more of you in the form of paperwork. You can read the basics in our guide on transponder keys explained.

Push button start vehicles use proximity fobs that the car senses through radio signals, and those fobs are paired with the car in a similar way. Adding a second one while the first works is the lower stress path.

Many cars come with only one or two keys from the start, and some owners bought used vehicles with a single key. In those cases, a spare is more than a convenience. It is protection against the day when that only key goes missing, which is a day nobody plans for.

Keep in mind that a remote key has a small battery, and a worn button can fail while the chip inside still works. A spare gives you a way to tell whether the problem is the key or the car.

With every key gone, a house lock can still be handled. A professional may open the door without damage, take the cylinder apart, read the pin sizes and cut a key that fits. It is skilled work and it takes longer than copying.

For a vehicle, the starting point is the vehicle's identification number and proof that you own it. The technician then works out the key cut from the lock or from stored data and programs a new key. It is doable, but there are more steps, and each of them needs the right tools.

Our note on what to gather when you lose every key lists the papers and details that save the most time on that road.

Expect a car key from nothing to take more patience than a copy. The technician may need to confirm your ownership, look up the correct blank, cut the blade and connect programming equipment to the vehicle. Each step has to finish before the next one begins.

Some vehicles allow the programming to happen at the roadside, while others have extra security that adds steps. Tell the team the make, model and year so the right equipment is brought in the van.

Plan for patience on that road. A lockout and a missing key together can stretch a visit, and it is better to hear that plainly at the start than to be surprised later. A 24 hour emergency locksmith can start the work any hour, but the steps themselves still take the time they take.

A key that is half worn out is a warning sign. When the teeth of a key flatten, it lifts the pins in the lock less precisely, and the lock begins to feel sticky. A spare cut from a fresh pattern, and a retirement of the old key, can bring back a lock that seemed to be failing.

If your key is already hard to turn, do not copy it blindly. Have a professional look at both the key and the lock. A copy of a failing key can fail the same way, and the problem may actually be in the cylinder, not the key.

This is a good time to mention it to the technician. They can compare your key to a fresh blank and tell you whether it is the key or the lock that is tired.

Think about the lock too. Dust, old grease and a bit of road grit can pack into a keyway over time, and a new key may then drag until the lock is cleaned. Ask the technician to inspect the cylinder while they are there.

It is a small habit worth building: any time a key is made, test it in every lock it is meant to open, not only the main door.

A spare is only as useful as its location. A key left in a drawer in the same house as the first one does little if the lost key was in the same bag. Think about the situations that could take out both: a fire, a flood, a stolen bag, a vehicle left at a trailhead.

Many people give one copy to a trusted relative or neighbor and keep one somewhere safe at home. Our note on storing spare keys safely covers what makes a good hiding spot and what makes a poor one.

Think about how many copies you truly need. Each key is another thing that can be lost or lent, so more is not always better. Two or three is often plenty for a household.

Share thoughtfully. If you give a spare to a house sitter or a relative, write down who has one. When a person no longer needs access, that key should come back, or the lock should be changed.

Do not label a spare with your address. A plain tag with a number, or no tag at all, tells a finder nothing about where the key belongs.

In this part of California, a lockout can happen far from help. Picture a drive on Highway 299 or Interstate 5 where the next town is a long stretch away, or a snow covered pullout near Mount Shasta in the evening. A spare in the right hands turns those moments into a short wait instead of a long one.

Outdoor routines raise the odds as well. Hiking, fishing and boating all put keys in pockets that get wet, muddy and caught on branches. Our guide to carrying keys on the trail and the water goes deeper on that.

If you commute across the region, a spare in a safe place at home gives your family a way to meet you with a key.

Weather plays a role too. In the mountain towns, a cold morning can freeze a lock or make a plastic head brittle. In the valley, summer heat can warp plastic parts and soften glue in key fobs. Carrying a spare in a separate bag guards against both.

If your work takes you outdoors, such as on a farm, a boat or a construction site, a spare at home or in the office is a sensible plan, because the key on your belt is the one most likely to be lost.

If you live somewhere with snow, a spare in a dry indoor place is worth more in January than in July. A frozen lock and a lost key in a parking area at dusk is the kind of moment where a second key quietly saves the evening, and the people who planned for it rarely mention it afterward.

If you plan to rekey your locks, the right moment to cut spares is right then. A technician can set the new pin pattern and cut all the keys you need as part of the same visit, so everything matches and nothing is left over.

That keeps the number of old keys in the world to a minimum. Rekeying makes all earlier keys stop working, which is a good moment to think about who ought to receive a copy and who no longer should.

Ask whether the new keys can also be made restricted, which limits who can copy them. Our guide on restricted keys explains the idea.

Keep a simple record of what you did. A note listing each key, who holds it and which locks it opens is easy to write and rarely looked at, until the day it saves an hour of guessing.

If you ever sell the house or the vehicle, that same record helps you pass along every key properly.

Ask yourself three plain questions. Do I have a key that works smoothly right now? Is there a vehicle or door where losing that key would cause real trouble? Do I have a safe place to leave a second one? If the answers are yes, yes and yes, act soon.

If your key sticks, shows a crack, or has a fob that only sometimes works, do not wait for it to fail on its own schedule. A failing key tends to quit at the worst time.

Also consider your own habits. If you have lost keys before, or if you lend your car often, a spare is inexpensive peace of mind compared with the work of replacing everything from nothing.

There is no prize for waiting. A person who copies a key this week rarely thinks about it again, while a person who waits is gambling on a worn key lasting forever.

If cost worries you, remember that the alternative is usually more involved work, and a spare made on your own schedule can be planned around other errands.

Our team works from a branded service van that carries key cutting and programming equipment, so a spare can often be made where you are. Describe what you need through the request form. The phone line is coming soon.

For a car, tell us the make, model and year, and whether the key is a plain blade, a transponder key or a push button fob. Read more on car key replacement to see how we describe the work.

For a house, tell us the kind of lock and how many doors are involved. If you are thinking about a fresh start for all your locks, our lock installation page explains the options.

When the technician arrives, hand over the working key and mention anything odd about it. A key that sticks, a cracked head or a lock that needs a jiggle are useful clues. Ask for each new key to be tested in front of you, including the trunk, glove box and any remote buttons on a car key.

Then store the originals and the copies in different places, so one bad day cannot take them all.