Why the hidden spare key is a poor idea
People have been hiding keys outdoors for generations, and anyone who has watched a home for a while knows the favorite spots: under the mat, inside a fake rock, in a planter, above the door frame, under a flower pot, behind a utility meter or in the mailbox. A person who wants in does not need to defeat the lock if the key is sitting a few steps away.
The practical problem is that a hidden key defeats the whole point of the lock. You can have an excellent deadbolt on a solid door, and a key under a mat undoes it. The risk is not only from strangers. A hidden key can be found by someone who does not live in the home, and you may never know it was used.
That does not mean that you should never have a spare. It means the spare should be somewhere that is controlled. The answer is either a person you trust, a lockbox with a combination or electronic access that you can change, or a different way of getting in that does not depend on a spare key at all. The rest of this page covers those choices.
What a lockbox or key safe is
A lockbox, sometimes called a key safe, is a small metal box with a lock of its own, designed to hold one or more keys. You open it with a combination, a keypad PIN or, in some models, a key or a smartphone. The key inside is protected by the box, and the box is either mounted to a wall or hung from something such as a door handle or a gate.
There are two broad types. Wall-mounted boxes are fixed to masonry or a solid surface with screws or anchors, which makes them harder to remove. Shackle or hanging boxes are looped over a handle or a pipe, and they are easier to move but also easier to remove. Wall-mounted types are generally better for long-term use, and shackle types suit short-term needs such as an open house.
Lockboxes differ widely in construction. Some are heavy and well built, with hardened steel bodies, shrouds to protect the combination dial and weather seals. Others are light and have thin casings. Since they will be exposed to Miami humidity, sun and rain, a well-sealed, corrosion-resistant box is more likely to continue working over time.
Where a lockbox helps and where it does not
A lockbox works well when a limited number of trusted people need occasional access and you want to be able to change the combination whenever anyone leaves. Examples include a family home where a relative may need to let in a repair visit, a short-term rental where guests arrive at different times, a home with a caregiver or a house that is being shown by an agent.
It is less helpful when many people need regular access, when you cannot reliably change the combination, or when you want to know exactly who enters and when. In those cases, a keypad lock or a smart lock with individual PINs may serve better, and you can learn about those in the smart lock guide.
A lockbox does not replace sound hardware and habits. It is a convenient way to hold a key, not a substitute for a good door, a good lock and good key control. See key control for families and key control for landlords and property owners for the broader picture.
Choosing a box: what to look for
Start with construction. A solid metal body, a protected combination mechanism and a sealed lid are signs of a better box. Check whether the shackle or mounting hardware is made of hardened material. Consider whether it has a weather cover, since rain and salt air can damage mechanisms over time.
Think about the combination. A four-digit dial has fewer possible combinations than a longer combination or a keypad with a longer PIN. Avoid birth years, house numbers or sequences that can be guessed. Choose a combination that has no link to the property and change it regularly. A box that allows you to set your own combination, and to change it easily, suits households that have frequent access changes.
Think about the size of the key. Some boxes hold a single house key and are small, while others can hold several keys, fobs or cards. A bigger box is not always better, since a bigger box is more visible and may hold more than you intended to store in one place. Match the box to what you actually need to put in it.
- Solid metal body and mounting points
- Weather sealing and corrosion resistance
- A combination or PIN length that is hard to guess
- Ability to change the combination yourself
- Size that fits the key without extra space
Where to mount it
A lockbox on a solid, fixed surface is much better than one hanging from a handle. A wall-mounted box secured into masonry or solid framing is difficult to remove and does not move with a door. In many Miami-Dade homes, the exterior walls are concrete block, which gives a strong mounting surface when the right anchors are used.
Choose a location that is functional but not obvious. A box next to the front door in view of the street advertises the arrangement. A box on a side wall, in a place that is visible to neighbors but not to every passerby, is a better compromise. Avoid placing it where a person could work on it unobserved for a long time.
Think also about who must be able to reach it. A caregiver arriving at night needs light. An elderly relative may need a box at a comfortable height. A guest in a rental needs clear instructions. The best location balances security and practical access. If you rent or live in an association building, get permission before mounting anything on the exterior.
Managing the combination
A lockbox is only as secure as the combination. Treat it like a PIN. Do not write it on the box, do not text it widely and do not leave it in a message that stays in a phone for years. Share it only with the people who need it, and write down who knows it.
Change the combination when anyone with access leaves the household, when a contractor finishes, when a tenant moves out or at regular intervals. For rentals and shared homes, many owners change it after every stay or every vacancy. It takes a minute and removes a whole set of worries.
If you have forgotten the combination, do not force the box open. Many boxes can be reset through the maker's own procedure, so start with the instructions that came with it. If you are locked out because the key is in a box you cannot open, call and describe the situation, and a technician can discuss options. We do not describe ways of defeating locks or boxes, and we do not recommend any attempt to do so yourself.
Safer alternatives to hiding a key
Often the best alternative is a trusted person. A neighbor, a relative or a friend who lives nearby and can let you in is a straightforward option. Agree what they will do with the key, and note who holds it. If you move, change plans or lose touch, retrieve it or rekey.
Another is a keypad lock or smart lock, which lets you enter without a key at all. You can give a PIN to a visitor and remove it later. You then do not need a spare key outside. Be sure you understand how the lock behaves when the batteries are low or the network is down, and keep a backup plan.
A third option is to change how you get in. If you often lock yourself out, a different habit may help: a key on a lanyard, a fob on a bag, a duplicate carried by another family member or a phone reminder before you leave. If lockouts keep happening, our page on lost house keys: what next explains what to do after the fact.
Condos, rentals and association rules
In a condo or an association, a lockbox on the exterior or in a corridor may be prohibited or restricted. Many associations have rules about what can be mounted on common elements and about lock changes. Check before you buy or install anything. If lockboxes are allowed, you may be asked to register the key with building management.
In rentals, your lease and your landlord's rules govern what you can do. Some landlords provide lockboxes for short-term guests, while others prohibit them. Where a box is allowed, the owner should keep a record of who has the combination and change it regularly.
Short-term rentals add complexity, since guests arrive and leave frequently. A lockbox can make handovers easy, but it is a security risk if the combination is not changed. A keypad lock with a different PIN for each guest is more controllable. See hotel and short-term rental locks for what owners commonly consider.
Safety and emergency access
Some people want a lockbox so that emergency responders or family can enter if there is a medical problem. This is a legitimate use, but it requires thought. Responders may have their own procedures for entering and may not use a box you provide. Talk with family about who will respond and how, and do not assume a lockbox will be used by anyone outside your own circle.
For a person who lives alone and may need help, a small group of trusted contacts with access is often more reliable than a hidden or boxed key. Our page on elder care and home access planning goes into more detail. In any emergency where someone is in danger, call 911 first.
If you are ever locked out and someone inside needs urgent help, such as a child or a person who is ill, call 911 first and then call a locksmith. Do not spend time hunting for a hidden key or trying to open a box while an emergency is under way.
Planning your setup and when to call
Decide who needs access, how often and for how long. Choose the type of box or alternative, mount it properly and set a combination you can manage. Write down who knows it, and set a reminder to change it when circumstances change. A simple plan like this is more secure than any hiding place.
If you want help mounting a box, choosing between a box and a keypad lock or rekeying your locks so that old hidden keys stop working, call and describe your situation. Quotes are given by phone, and more involved jobs may need an on-site visit first. A service call charge applies and is explained before dispatch.
If you have been using a hidden key for years and are not sure who knows about it, consider rekeying so the old key no longer works. It is a clean way to reset. When you are ready, call and we will talk through the options for your home.
Questions people ask
Is a lockbox safer than hiding a key under a mat?
Generally yes, if the box is well built, securely mounted and uses a combination that is hard to guess and changed regularly. A hidden key under a mat or in a planter is easy to find. A lockbox still needs management, and it is not a substitute for solid doors and good key control.
Where should I mount a key safe?
Choose a solid surface such as masonry or solid framing, using proper anchors. A wall-mounted box is better than one hanging from a handle. Pick a spot that is accessible to those who need it but not conspicuous from the street. In condos and rentals, ask permission before mounting anything on exterior or common surfaces.
How often should I change the combination?
Change it whenever someone with access leaves or finishes work, and after each guest or vacancy if you run a rental. Otherwise, a regular schedule such as a few times a year is sensible. Avoid obvious combinations such as birthdays or address numbers, and do not share the combination more widely than necessary.
What if I forget the combination or the box jams?
Do not force it. Many boxes can be reset using the manufacturer's procedure, and some have a backup key. If you cannot open it and you are locked out, call and describe the situation so a technician can talk through options. If someone inside is in danger, call 911 first.
Can emergency responders use my lockbox?
You cannot assume so. Responders have their own procedures and may not use a box you provide. If you want a plan for a medical emergency, talk with family or neighbors who can respond, and consider options such as a keypad lock with a family PIN. Always call 911 first in an emergency.
Is a keypad lock better than a lockbox?
It depends. A keypad lock removes the need for a spare key outside and lets you issue and remove PINs for different people. It adds batteries and electronics that need managing. A lockbox is simpler and does not need power but gives less control over who uses it. Our smart lock guide compares the tradeoffs.
Describe the situation by phone and we will tell you what the job involves. Quotes are given by phone. Jobs that cannot be quoted without seeing them need a technician on site, and the service call charge is explained on the phone before anyone is dispatched.
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Written by Claude (AI) (AI) for 24 Hour Locksmith Miami.