Common Problems With How to Store Spare Keys
Spare key storage is one of the most overlooked security decisions a homeowner or renter makes, yet the consequences of getting it wrong can range from a minor inconvenience to a full home break-in. Most people store a backup key without a plan, defaulting to predictable hiding spots or trusting arrangements that quietly unravel over time. Understanding the common problems with how to store spare keys — and the practical alternatives — is the first step toward closing one of the most common gaps in residential and commercial security.
Common Problems With How to Store Spare Keys Overview
The concept of a spare key sounds simple: make an extra copy, keep it somewhere accessible, and use it when the original is lost or unavailable. In practice, spare key management involves several moving parts — who has access, where the key is stored, whether the key is still current, and what happens if the storage location is discovered or compromised. Each of those variables introduces a separate category of risk.
Research on residential burglaries consistently shows that a significant number of unauthorized entries involve no forced entry at all. A key hidden under a doormat, inside a fake rock, above a door frame, or inside a flowerpot is often discovered within seconds by anyone who has seen the same hiding spots before — which is to say, almost any adult. These locations are so culturally familiar that they function less as hiding places and more as known key deposit boxes.
Beyond the physical hiding spot, there is the question of key proliferation: copies made for housekeepers, dog walkers, contractors, or relatives that were never returned or accounted for after the relationship ended. Over time, the number of people who have had access to a property often exceeds the homeowner’s memory. That accumulated access represents real, ongoing risk — one that no lock upgrade addresses unless the keys are also controlled.
Key Factors
Several specific factors determine whether a spare key arrangement is reasonably secure or actively dangerous. The first is location predictability. Any hiding spot that a stranger could locate in under two minutes by checking obvious places — under exterior mats, inside potted plants near the door, on top of ledges, behind address signs — provides almost no security. The familiarity of these locations is exactly what makes them feel convenient and exactly what makes them unreliable.
The second factor is access accountability. A spare key that has been given to another person provides security only as long as that person is trustworthy and still in possession of the key. When employment or personal relationships end, keys are frequently not returned, and even when they are, there is no way to verify that a copy was not made. Without a formal key management process — including documentation of who received which key and when — access control erodes silently.
The third factor is physical key security. A key stored in a combination lockbox is meaningfully more secure than one hidden loosely, but only if the lockbox itself is tamper-resistant, properly mounted, and uses a code that is changed periodically. Inexpensive lockboxes sold at hardware stores vary widely in their resistance to shimming, prying, and code-guessing. The quality of the container matters as much as the concept.
A fourth factor is currency: whether the spare key actually matches the current locks on the property. Lock re-keying or lock replacement events — after a move, a break-in, a lockout service call, or a change in occupancy — should trigger a review of all outstanding spare keys. In practice, this step is frequently skipped, leaving spare keys that no longer function while occupants assume they do. That creates its own problem in an emergency when the backup key is needed and does not work.
Costs and Risks
The financial and security costs of poor spare key management fall into several categories. On the lower end, a spare key that no longer fits the lock simply fails when needed, leading to a lockout call. Average: $85 · Range: $65–$150 · Travel: free in service area. That cost is manageable, but it is also entirely avoidable with a routine key audit after any lock change.
The more serious cost is security compromise. A spare key in the wrong hands removes the need for any technical attack on the lock itself — there is no picking, bumping, or drilling involved, and there is frequently no sign of forced entry, which complicates insurance claims and investigations. Home invasions facilitated by unauthorized key access account for a notable share of residential crimes, and they are distinguished from other break-ins by how little evidence they leave behind.
Rekeying a property after a key is lost, stolen, or unaccounted for is a straightforward corrective measure. Average: $25–$50 per lock cylinder · Range: $20–$75 · Travel: free in service area. For a standard home with three or four keyed locks, rekeying is a cost-effective way to restore control. In cases where multiple doors, deadbolts, and accessory locks are involved, a locksmith can often key all cylinders to a single key, simplifying management going forward.
High-security key systems add another layer of protection. Restricted keyways — key profiles that are not available at hardware stores or standard duplication kiosks — prevent unauthorized copies from being made without the property owner’s authorization. These systems typically come with a higher upfront cost per cylinder but reduce the long-term risk of uncontrolled key duplication. Average cylinder cost with restricted keyway: $80–$200 · Range: $60–$300 · Travel: free in service area.
Smart locks and electronic access systems eliminate the physical spare key problem entirely for primary entry points. A door equipped with a keypad, app-based access, or smart lock can issue temporary or recurring access codes to specific people, revoke those codes instantly, and log entry events. The spare key concern is replaced by credential management, which is easier to audit and modify remotely. Entry-level smart lock installations average $150–$300 including hardware and labor, though costs vary significantly by product and complexity.
When to Call a Locksmith
A professional locksmith should be contacted any time the security of a property’s key access is in question. That includes situations where a spare key is lost or unaccounted for, where a tenant or employee relationship has ended and key return cannot be confirmed, where a property has just been purchased and the previous key history is unknown, or where a break-in has occurred and the access point has not been fully secured.
A locksmith can assess the existing lock hardware, recommend rekeying or replacement based on current condition and security grade, and key multiple locks to a single new key for simplified management. In situations where spare key access is operationally necessary — for a property manager, a family caregiver, or a rental unit — a locksmith can advise on appropriate lockbox hardware, key control systems, or electronic access solutions that match the use case.
It is also worth calling a locksmith when setting up a spare key arrangement for the first time, rather than after a problem has occurred. A brief consultation can identify whether the existing locks support rekeying to a restricted keyway, whether the hardware is at a grade appropriate for the property’s exposure level, and whether a key management plan is realistic given the number of people who need access. Proactive planning is considerably less expensive than emergency response.
If a property has experienced a lockout and a locksmith was called to gain entry through a method other than the original key, the locksmith can explain what vulnerabilities were exploited during the service call. Understanding how entry was made — whether through lock picking, bypass, or a technique specific to a particular lock model — provides direct information about what upgrades would reduce that vulnerability in the future.
Recommended Next Steps
The most practical first step for most property owners is a spare key audit: a written or recorded list of every copy of every key that exists for the property, who has it, and when it was issued. This exercise frequently reveals copies that were given out and forgotten, and it identifies whether any keys need to be recovered or the relevant locks rekeyed. The audit should be repeated after any change in occupancy, staffing, or service relationships.
After the audit, any locks where key control cannot be confirmed should be rekeyed. Rekeying — changing the internal pin configuration of a cylinder to match a new key — is faster and less expensive than full lock replacement and provides equivalent security when the hardware itself is in good condition. A locksmith can often complete a whole-home rekey in under an hour.
For spare key storage going forward, a key-rated combination lockbox mounted to a fixed structure is a meaningful improvement over loose hiding spots, provided the lockbox meets a reasonable standard for tamper resistance and the combination is changed periodically. The Master Lock lock brand 5400D and similar products sold at major hardware retailers represent a baseline option; higher-rated products with hardened shackles and anti-shim mechanisms offer better resistance. A locksmith familiar with physical security can recommend specific products appropriate for the exposure level.
For properties where spare key access is needed regularly — short-term rentals, multi-unit buildings, properties with service staff — the administrative overhead of physical key management often makes electronic access a more practical solution. Smart locks with individual code assignment allow each authorized person to have a unique code that can be revoked without affecting others, and entry logs provide an auditable record. The upfront cost is higher than a lockbox, but the reduction in rekeying events and the improvement in access accountability often justify it over a two-to-three-year horizon.
Finally, any property that uses a restricted keyway system should maintain the authorization card issued with the system. That card is required for ordering additional keys and is the mechanism by which the property owner retains control over duplication. Losing the authorization card undermines the restricted keyway’s protection, because without it the chain of custody is broken. Store authorization cards separately from keys and in a location accessible to the property owner rather than embedded in the key management system itself.
You may also find useful: Common Problems With Home Lockout Prevention, What Homeowners Should Know About How to Build a Key Control Policy.
Call Low Rate Locksmith
Low Rate Locksmith provides 24/7 mobile locksmith services across the US and Canada, including spare key consultations, whole-property rekeying, high-security lock upgrades, and electronic access installation. If a spare key is missing, a lock needs to be updated, or a property’s key management plan needs a professional review, the team is reachable any time at (833) 439-8636. Travel is free within the service area, and all service pricing is provided before work begins.