The Best Lock Box

To find the best lock box, we spent hours on research, testing, interviews with a real estate agent and an experiment where we had a team of locksmiths break some open with hammers and tricks. We think the $33 Kidde Access Point Key Safe is the best lock box for homeowners looking to stash keys for visitors or to store a backup key. The dial format makes it exceptionally difficult for even a professional to decode, and the zinc alloy exterior is as sturdy as you can buy without spending over $400 for a professional kit.

Who needs a lock box?

When we say “lock box,” we’re referring to secure combination boxes for homeowners or renters to store keys so they’re available to other people. Besides being convenient for frequent house guests, lock boxes are a good way to hide keys while doing something outside the house like surfing or running.

If you’re a real estate professional, you don’t need this guide—Supra makes professional-level lock boxes with two-step security that are, as we learned from locksmiths and a veteran real estate agent, the absolute best way to store keys. We looked, but unfortunately there’s no reliable way to get one if you’re a regular citizen. For this review, we looked for boxes that approached the Supra’s build quality.

No lock box will stop a determined criminal

A break-in tool for the Word Lock.

A break-in tool for the Word Lock.

No device will stop a determined and well-equipped criminal. The adage and caveat applies to almost any type of security measure, and it certainly applies here. Even the toughest lock boxes can succumb to an expert’s hands.

We started our testing after researching and finding the most secure brands and models of lock boxes, most of which made from solid metal, usually a zinc alloy, measuring a little under a ¼” thick on each wall and weighing nearly two pounds. Several locksmiths I interviewed from around the Bay Area said that even with this construction, don’t expect much. “If you put a drill in the right place, it’s not that hard to get in,” one said. “If you know which part to attack, I can be in there in less than five minutes.”

The good news is that if you’re smart about where you place and the lock box (more on that later), you can minimize your chances of any persona non grata getting at your keys and infiltrating your car or house. A lock box placed in a clever location is more secure than an ostensibly bomb-proof container left in the open.

What makes a good lock box?

Before discussing strategies, we can look at the technology that’s available to us. The most secure lock boxes are the wall-mount boxes that have holes underneath the box’s secure door through which you can drive included screws. As we said, a determined thief with a crowbar or sledgehammer might be able to break a wall-mounted box, but doing so would cause a scene and draw enough attention to the deed to dissuade a break-in. As multiple locksmiths mentioned, at some point it’s just easier to bust down a front door.

These mount boxes are better than the alternative: shackle-style boxes with a U-loop that goes over a doorknob or gate for convenience. Ignore these. As one locksmith explained to me, a quick snip with bolt cutters will get through the loop on most model. If this happens, the perp can take the box away and use all of his faculties to break in without worrying about onlookers.

That said, there are a few circumstances when shackle boxes are ideal. When surfing, for example, if you need a lock box but can’t drill into your bumper, do your best with a shackle model. Try to hide it in the undercarriage. Leaving one on the car door handle, as some products suggest, makes for an obvious target, especially in an empty parking lot.

How they open

There are three common lock mechanisms. Push-button locks, which allow you to set a numerical combination you can punch in any order; wheel models, which use (typically) four vertical scrolling wheels with numbers or letters to form a combination; and dial models, for you enter the combination using one rotating dial like on a classic padlock on a high school locker.

We don’t recommend wheel models in any circumstance. All of our experts interviewed said that it’s easy to use a flashlight and piece of metal to peer inside the wheels and spot the combination.

Unless convenience is a priority, we’d avoid a push-button model, even though nearly all of the most reputed and heavy duty lock boxes are set up in that format.

With a push-button model, you open the box and use a piece of plastic inside to turn the knobs of the numbers you want for the combination. It’s as simple as it sounds, but there’s a major drawback: the numbers can be pressed in any sequence, so if your combo is 3-2-1, you can open it by pressing 2-1-3, or 1-2-3, and so on.

Whichever way you go, use cunning to make a break-in as difficult as possible for a potential perp.
We asked the manufacturer if it’s possible to just push all the buttons simultaneously and pop it open, and they said that, hypothetically, yes. But we tried — for example, with the 1-2-3 combination, we use a flat edge to press the entire left side of buttons down together, but we couldn’t get it open, so don’t worry too much about that. We do recommend you set a combination of at least five digits, which brings the number of potential combinations to over 1,000.

Unfortunately, since the sequence doesn’t matter, you can only use each number once in the combo. That means it’s hard to associate words or use combos that you’re familiar with, like a PIN. There’s no way around this; you need to pick a combo accordingly.

Another trick burglars (and locksmiths) use on push button models is to look at the wear for the numbers, so change the combo with some regularity. With the 3-2-1 setup, those numbers, if held under a blacklight, will show fingertip traces. If the box goes longer without a new combo, the keys themselves can get worn down with use. Along with the five-digit minimum, switch the combination as often as you can without confusing the people who need to use it regularly.

If you’re nervous about break-ins and don’t need the simplicity of a push-button model for kids or friends, get a dial model. Setup, as we found, is tricky compared to the push-button models—you layer metal discs inside the box, a process that took us about 15 minutes to complete, but dial models have none of the button or wheel models’ aforementioned security flaws.

Another issue we observed with almost all of the top models we considered was their small size. They’re built that way to be secure without being too heavy, but they can only really accommodate basic, flat keys. The big key fobs that go with a BMW or even a Prius will be too big. Fortunately, though, these lock boxes are made for getting into a house, and that only requires a regular key. When using a box for storing one of these fobs, my solution has been to use a dumb or “valet” key that only opens the car door, and hide the full key fob somewhere inside.

In short, the most secure-but-everyday-usable lock boxes are dial models that can be screwed to a wall. A button-style works if you need convenience. Whichever way you go, use cunning to make a break-in as difficult as possible for a potential perp.

Where to put your lock box

When you have your sturdy lock box, your goal is to add obstacles to a potential break-in. To do this, as our locksmiths explained to us, consider your residence’s variables, like the layout of the door you’re looking to protect, the particulars of public space, and the presence of outdoor light.

Position the wall-mount box to disguise what’s inside, making it impossible to figure out what a thief would to do with the contents even if he did get it open. If you live in an apartment like I do, attaching a lock box to the wood panel directly next to the front door makes it obvious that box will have the keys to my apartment. Instead, you should attach the box to a shared wall, or the side of a shared porch. This way, the time it’d take a burglar to figure out the correct door for the box’s keys can be enough of an deterrent to discourage a break-in. Better yet, position it so no one can see the lock box from the street.

If you live in an urban setting and don’t have the option to put the box somewhere discreet, don’t worry too much. “They’re built like little safes,” says Alex Kamand, owner of Kamand Locksmith. “It’d take 45 minutes with a sledgehammer…it’d end up being easier to break down the door.” In an area with lots of foot and car traffic, the scene caused by using an axle grinder or drill isn’t worth the risk. “If it’s screwed in nice and secure in the wall,” Kamand says. “Someone out front with a drill isn’t going to try.”

If you’re a homeowner, try to mount the lock box somewhere discreet, like on the rear of the garage or on a dog house. From there, you can create two-step (or more) security by, for example, loading the box with the key to your garage; in your garage, you can hide the key to your front door. Be creative in making entry difficult for anyone who doesn’t know the process.

If you’re questioning this method’s efficacy, when Justin, a veteran locksmith at Lock World in San Francisco, needs to keep a key handy for his place up in Napa, he stashes it in a cheap rock hide-a-key that he places down the block—if this sounds ideal for you, we have some picks for fake rocks further down.

Again, don’t use a shackle lock, especially on your doorknob. Yes, everyone does that, but besides clearly identifying that it contains the keys to that door, it also says that there’s likely that no one’s home. “A bolt cutter can probably go right through it,” one locksmith said. “Then they have all day to open it.” Besides that, a shackle lock on a doorknob gives an otherwise disinterested thief what Justin aptly describes as “temptation.” Do not use it on your doorknob.

How we picked finalists

Outside of user reviews, there is no formal literature assessing lock boxes, so we started from scratch. We started with user reviews from Amazon and home improvement stores, then got feedback from professional locksmiths and a real estate agent.

There are few brands that make lock boxes. Besides MasterLock and Kidde, there are only tiny companies like Vault Locks and ShurLock, most of which produce exclusively wheel-style models—no good. After learning how easy it is to crack a wheel lock, we only considered dial and button models. After hearing from locksmiths that bolt cutters could snip any shackle model, we focused on wall mounts.

From there, we looked at models from the popular brands like Master Lock, but our real estate agent and locksmiths told us that Supra’s professional line was unequivocally the best out there. These lock boxes have sensors that only open for users who have authorization, either through Bluetooth on a smartphone, or with a secondary dedicated electronic key. Agents can transfer codes for buyers to enter, but only someone with an authorized device can get inside. It can also be set to only open during certain times of day. As for break-ins, they’re exceptionally sturdy, and one locksmith said that for all the sledgehammer-ing and conspicuous blunt force it’d take to break one of these open, a perp would sooner be able to force his way through the front door. We asked, but Supra was expectedly mum about the exact build of their lock boxes, but we take the unanimous opinion of locksmiths and real estate professionals. Again, we tried, but unless you’re in the business, it’s impossible to find a reliable dealer for these Supra lock boxes.

We learned, though, that Kidde makes the consumer version of the Supra boxes—this means that the Supra’s designs are scaled down in size and the interface is simplified so, for example, a child could use it. They’re made from the same durable steel casing as their professional kin, but without the electronic verification. Though this relationship is far from a certain testament to Kidde’s quality, we learned that they also produce professional-grade lock systems for firefighters and construction companies that need to store keys. That got us to trust their design acumen.

Kidde’s design connection to Supra, coupled with their mostly laudatory customer reviews, pushed their Access Point lineup into the short list of finalists that we called in for review. We also tested the high-selling Master Lock key boxes, along with a wheel-dial model from WordLock.  We judged them based on everyday usability and from the results after a team of pro locksmiths broke them down and assessed their security.

Testing with locksmiths and their hammers

The user experience is mostly similar between models: for the button models, on the back of the door, you twist the screw for the numbers you want to have as your combo. The dial models, however, have a set of metal discs inside that require some finesse to get right. We factored those features into our testing.

Breaking into one of the Kidde models would be, as every expert had said, so much effort that it’d be simpler to just break down the front door.
 To get a professional assessment of these boxes’ security, I delivered a button Master Lock, the WordLock, a shackle-style button Kidde, a wall-mount button Kidde, and a dial shackle-style Kidde (which is also available as a wall-mount) to Justin at Lock World. He was booked with jobs and couldn’t evaluate them for us on the spot, so he and his team took them for several days to try to crack the combinations and break them open with simple tools.

Kidde Button, broken with a screwdriver by locksmiths.

Kidde Button, broken with a screwdriver by locksmiths.

After they finished disassembling them, he spread them out across his shop’s work bench, all of them with the doors broken off of the housing. “We hit them with a hammer and flat-head screwdriver,” he said, as indicated by the warped metal around the main switch. He said it took expert precision and heavy swings to break open the Kidde boxes, both luxuries that aren’t typically available to an opportunistic burglar. Breaking into one of the Kidde models would be, as every expert had said, so much effort that it’d be simpler to just break down the front door. Again, the danger, as he and other locksmiths explained, is in having a box that’s easily decoded. When that happens, the thief can copy the key without the homeowner knowing that the security has been compromised. We asked him to specifically assess how easy it would be to crack these combos.

The broken Word Lock.

The broken Word Lock.

The WordLock, like all wheel-style combination locks, opened easily with a thin piece of metal and sensitive hands (see photo). The same technique worked on the wheel Master Lock, too. As the dents in the bottom container of the WordLock showed, it was easy to break it off of the main housing. “You could do this with a rock,” he said. Both were out of the running to us.

Inside of the Master Lock.

Inside of the Master Lock.

When I asked him about the button models’ security, he handed me the button-style Master Lock, and told me to put a new combo in it. I did, with three digits, and he handed it to another locksmith; with only his fingers and brain, he opened it in 45 seconds.

The ease with which his team negotiated those popular setups led us to the model that was impervious to these tactics.

The pick

The Kidde Access Point dial lock box has the most secure exterior you can get in a consumer lock box. With the dial lock, it’s exceptionally difficult for anyone without extensive training to get inside it. The dial, while a bit more difficult to set up and open than the button models, has exceptional security.  It has the capacity to hold up to five flat keys.

Justin found that the dial Kidde was the undisputedly most secure. “The dial model takes the cake,” he said. “It can also be manipulated, but even if I taught you, you couldn’t do it easily.” The dial model, Justin explained, is tough enough to resist most thieves’ brute force, and cracking it open would require expert skill. Both are enough to dissuade most potential burglars.

Who else likes it

Satisfied Amazon customers, basically—from 13 buyers, this specific model gets 4.5 out of 5 stars, which indicates a solid product to us. As mentioned, no one has done a survey of lock boxes, so we had to do most of this ourselves. Kidde won our attention with the advocacy from a professional locksmith, and the brand’s reputation as producer of the favorite lock box of real estate agents, the Supra. The Kidde may not be as robust as the professional variants, but with smart use it is plenty strong, especially compared to the cheap and flimsy competition.

The step up

Also Great
Knox Box Master Key Retention
Although The Knox Box Master Key Retention box will set you back at least $200 more than our pick, it gives emergency response workers access to your house.
As every locksmith told me, you remove potential criminals’ temptation by keeping the lock box hidden. If you follow that rule, you really don’t need to spend money on a professional-grade model. The ostensible extra security doesn’t make a purchase worth the money. If you’re truly paranoid and must have something more substantial, Justin likes the boxes made by Knox. Know that these are made specifically for emergency responders—rather than bust down your front door, firefighters and paramedics have an authorized PIN code for these boxes so they can get the key to your house and gingerly open the front door. These boxes aren’t meant for your friends to use when they’re housesitting. Even if you can get your hands on one, be prepared to pay for installation and a starting price of close to $200.

For the average homeowner looking to share keys with friends from out of town or something to let kids in, the Kidde Access Point will be plenty.

A stealth approach

Step Down

*At the time of publishing, the price was $5.

Hide-a-Key Fake Rock
At only $5 the Hide-A-Key Fake Rock is the most cost-efficient way to make sure whomever is looking after your house while you're away is able to get in safely.
If you can tolerate something less convenient and want to spend just $5, you can get this fake rock and stash your key inside. As we mentioned, Justin keeps the key for his house in Napa in a fake rock that he places way down the block. That way, should an opportunistic thief come across it, there’s no way to know which house it opens. Neighbors will get suspicious if someone is taking a key door-to-door.

We looked hard to find the best fake rock, and this one is what we’d get. We trust the 4.5 out of 5 stars from about 50 Amazon customers. Some complain that it looks somewhat fake, while others say it looked so convincing that they lost it.

This $65 combination rock that featured isn’t worth the price. It’s way too expensive, and, as mentioned, cracking a wheel lock isn’t tough.

If you have in-ground sprinklers, you can get the Sprinkler Head Hide-A-Key from Trademark Tools. If you set it in the dirt, it’s even harder to spot than a rock, and it won’t unexpectedly shift around.

Whatever you get, just place it somewhere inconspicuous so that there’s no way to tell to which house it belongs.

Why isn’t the rock our main pick? For city dwellers, and for some suburban homeowners, a rock on a concrete sidewalk or a perfectly manicured lawn is conspicuous. You’ll sleep more easily if a difficult combination stands between burglars and your front door.

The competition

There are dozens of different lock boxes out there, but once we learned how flimsy wheel locks and button locks are, we dismissed a majority of competitors. The Master Lock 5400D, for example, can be had with a bit of metal and some sensitive fingertips. That meant we couldn’t recommend models like this one from Vault Locks, either.

Button locks present more options, but they, too, are very susceptible to a break in by an expert. That includes models like this one from Key Guard, one of many competitors that don’t come close to matching the sturdiness of the Supra/Kidde build.

We also tested the Master Lock 5900D, but the plastic exterior and thin cable connector made it feel fragile. The wheel combo system, of course, is easy to crack.

We also dismissed boxes like the wheel-combo SurfLock, the ShurLock SL200W and the Vault Locks 3200. Wheel combo, thin and clip-able shackles, and a plastic body are pointless when a solid steel Kidde with a dial is only $10 more.

Lockitron is coming out with a smartphone-based lock system that puts a cover on the door’s deadbolt. The device locks and unlocks it via an app, or, if you have an older phone, text message. The Lockitron just met its crowd-funding goal and we’ll update as reviews are published. For now, though, we’re hesitant to have a key system that depends on having a charged phone.

Wrapping it up

If you use it correctly, the Kidde Access Point dial lock will let friends and family into your house when you can’t hand off the keys, but it’ll keep out burglars.

A special thank you to Justin at Lock World in San Francisco, who tinkered with our test units to figure out what’s most secure. They’re a knowledgeable lock service if you need a locksmith in the Bay Area. And thank you to Elizabeth Weintraub,’s real estate expert, for turning us on to Supra.

*At the time of publishing, the price was $33.

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  1. Justin Jacobs , Lock Smith , Interview
  2. Elizabeth Weintraub, Real Estate Expert , Interview

Originally published: November 19, 2013

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  • Kent Wang

    If you can install a new lock that has a number pad instead of keys, that would obviate the need for a lock box.

  • Oya

    has anyone done reviews on home safes? Nothing fancy – simply to keep cash and jewelry away from view

  • Tim

    If you’re on good terms with your neighbours, then you can add another layer of security by each installing a lock-box and switching the keys. Even if they break into your lock box, they’ll have the wrong key and may assume it’s an old key and you’ve had your locks replaced since then.

  • John Mertz

    You could also get an electronic lock box, like the NuSet 7060 from It is very rugged, has an electronic, keypad lock, and can be outfitted with a key retractor so the key never leaves the box. This lock box also allows you to monitor who has accessed the key lock box and when.

    • tony kaye

      Is that the only site you can purchase these from?

      • John Mertz

        No .. Nuset sells them directly and so does amazon. But Selectlocks has the best price and customer service.

        • tony kaye

          Thanks for the heads up!

  • td99

    Very interesting options. I’ve taken the “multi-tiered” approach:

    1. We typically enter the house via the garage door which is opened by the programmed HomeLink button built into the rear-view mirrors of our cars.

    2. Should that fail (or we aren’t in our cars), I can either enter a code on my garage door keypad or use my house key on the front door.

    3. If the keypad’s battery is dead and I don’t have my house key, I can use an app on my cell phone to open the garage door.

    4. If I don’t have my phone or it’s dead, or if the garage door opener is inoperable for any reason, I have a dummy sprinkler head buried in my front yard (bought it from Home Depot so it matches my other sprinkler heads perfectly) which contains a spare key to my side gate.

    5. Once inside my side gate, I can walk around the house, across the backyard to the back door of the garage where I enter a code into my Schlage Keypad Deadbolt. This gets me into the garage. I then enter a code on my Schlage Keypad Door Lock to go from the garage into the house.

    6. If the battery is dead on the Schlage Keypad Deadbolt thereby preventing me from getting into the garage, I can go into “manual mode” by using my spare side gate key to open one of the storage sheds in my backyard (which have the same keyed lock as the side gate) where I have a well-hidden spare house key. I can then use it on both Schlage Keypad locks to gain entry or go back around to the front door as I have keyed all three the same.

    Lastly, my garage door also automated and set to 10 minutes in the event it’s left open. If it doesn’t detect motion for 10 minutes, a loud beeping alert is sounded and then the door closes automatically. I am then sent an email alert that the garage was left open.

    • Ken Esq

      One warning…those in-car remotes tend to work even when the car is turned off. So, someone that breaks into your car now has easy access into your home.

      • td99

        Not BMW. Car must actually be running. Inserting the key fob isn’t enough.

  • sierracyclist

    So, if I read this correctly, button-style mechanisms are inherently weak?

    If so, it’s too bad, as this Supra/Kiddie model looks fairly impressive and is placed at a good price point:

    Kidde AccessPoint 002047 KeySafe Professional Security Key Box, Gray

    I gather the polished steel plate reduces the “button wear” issue which could divulge the numbers in use.

    • tony kaye

      Still riskier than the other options available!

  • Azrael Gabbana

    I like these options! Since that I don’t have much budget yet with security systems, perhaps I can opt for these cheaper security items. I’m glad I managed to browse this article.Now I can fully understand their value before taking a trip to the online shop called

  • LockBoxGuy

    I’m not sure why the article dismisses the ShurLok lock box when they obviously haven’t done their research on it. The ShurLok has been on the market for over 20 years and is extremely reliable, secure and durable. The body and vault of the lock box is made of metal, not plastic, which the article depicts as a pointless plastic body?

    Another issue is that this is a wall mount version in which there is no shackle needed. The author says the ShurLoks shackle is “thin and clip-able” when in reality it is the same standard hardened steel shackle used on all shackle lock boxes such as the one they refer to in the article.

    • tony kaye

      Wheel combo, thin and clip-able shackles…are pointless when a solid steel Kidde with a dial is only $10 more