What You Need to Know About Installing Smart Locks for Vacation Rentals

Installing a smart lock in your vacation rental is a key initiative that simultaneously streamlines guest interactions and improves security. By eliminating the hassle of key handovers and enabling self check-in at any hour, smart locks have become an essential piece of equipment for today’s vacation rental operators.

That said, “smart lock” is a broad term covering a wide range of types, features, and price points. Choosing a product that doesn’t match your property’s conditions or your operating style can actually become a source of trouble. This article comprehensively covers everything you need to know when installing smart locks for vacation rentals, from product selection to legal requirements and operational precautions.

Whether you’re considering installing a smart lock for the first time or already have one and are thinking about switching, this guide will be useful. Please read on to the end.

Benefits of Installing Smart Locks in Vacation Rentals

No More Physical Key Handovers

In traditional vacation rental operations, hosts had to physically hand over keys in line with each guest’s check-in time. This meant accommodating late-night flight arrivals and schedule changes, placing a significant time burden on hosts. With a smart lock installed, all that’s needed is sending the guest a PIN code or one-time passcode in advance to complete check-in. This also eliminates the risk of key box theft and the cost of replacing lost keys (typically ¥10,000–¥30,000 per incident).

Enables Remote Management

With a Wi-Fi-enabled smart lock, you can check the lock/unlock status in real time from a smartphone app. If a guest fails to lock up after checking out, you can remotely lock the door yourself. For operators managing multiple properties, being able to monitor the lock status of every property from a single app dramatically improves operational efficiency. In fact, many hosts managing five or more properties report cutting key-related administrative time by more than 10 hours per month after installing smart locks.

Improved Security

Smart locks allow you to issue a unique PIN code for each guest and automatically deactivate it after checkout. This eliminates the risk of a former guest using a duplicated key to re-enter the property. In addition, lock and unlock activity is logged, providing an objective record that can be referenced if any issues arise. This kind of history tracking is simply impossible with physical keys, giving smart locks a clear security advantage.

Types of Smart Locks and How to Choose

Differences in Installation Method

Smart locks generally fall into three installation categories: “retrofit adhesive type,” “cylinder replacement type,” and “drilled installation type.” The adhesive type simply attaches over the existing thumb-turn, making it easy to restore the door to its original condition—ideal for rental properties. Popular examples include SwitchBot Lock and Qrio Lock, priced around ¥10,000–¥20,000. The cylinder replacement type involves swapping out the entire door lock cylinder; products from EPIC and SAMSUNG fall into this category, priced around ¥30,000–¥70,000. The drilled installation type is the most robust option but costs ¥50,000–¥150,000 to install, making it better suited for owned properties.

Types of Unlocking Methods

Smart locks can be unlocked via PIN code, smartphone app, IC card, fingerprint recognition, or remote key fob. For vacation rental use, PIN code entry is by far the most practical, since it doesn’t require guests to install a dedicated app. International guests in particular may be unable to download apps from Japanese app stores, or may have unstable network connections, so it’s wise to choose a model that can be unlocked with a numeric keypad. Most products support PIN codes of 4 to 12 digits, and for better security, a code of 6 digits or more is recommended.

Connectivity and Remote Operation

Smart locks are generally divided into Bluetooth-only models and models that support Wi-Fi or LTE connectivity. With Bluetooth-only models, your smartphone must be near the lock to operate it, meaning remote control isn’t possible. Some products support remote operation if you additionally purchase a Wi-Fi hub or gateway (typically ¥3,000–¥5,000). Since remote management is practically essential for vacation rental operations, we recommend considering a Wi-Fi-enabled model or purchasing one bundled with a hub.

Legal Requirements to Check Before Installation

Guest Identity Verification Under the Hotel Business Act and Private Lodging Business Act

Vacation rental operators are legally required to verify the identity of guests. Under the Private Lodging Business Act (Japan’s “Minpaku” law), identity verification must be conducted either in person or via ICT (information and communication technology). If you’re using a smart lock for unattended check-in, you’ll need to either install a tablet device for video-call-based identity verification, or integrate a dedicated identity verification system (such as CheckIn, Keeyls, minpakuIN, or aiabor). A smart lock alone cannot fulfill the legal requirement for identity verification, so be sure to plan for a complementary system alongside it.

Fire Safety Considerations for Evacuation Routes

If a smart lock becomes inoperable due to a dead battery or system malfunction, guests could end up trapped inside the unit. From a fire safety standpoint, ensuring a clear evacuation route is essential. Most smart locks include a manual thumb-turn unlock function that works from inside the room, but you must confirm this function operates correctly at the time of installation. It’s also important to choose a model that supports backup unlocking with a physical key, and to keep a spare key stored somewhere reliable. Common approaches include entrusting a spare key to a nearby management partner, or installing a PIN-code key box in an inconspicuous location.

Checking Condominium Management Rules

If you’re operating a vacation rental in a condominium unit, the building’s management rules may restrict smart lock installation. Drilled installation-type smart locks that alter the exterior appearance of the door—a shared/common area—typically require approval from the management association. Adhesive-type locks, which don’t change the door’s exterior, may not require approval, but failing to check with the management association beforehand can lead to disputes down the line. For rental properties, it’s advisable to obtain written permission from the property owner or management company in advance.

Operational Issues and How to Address Them

Dealing With Dead Batteries

Most smart locks run on AA or AAA batteries, or sometimes lithium batteries. Typical battery life ranges from six months to a year, but this can vary significantly depending on usage frequency and temperature. In winter, batteries tend to drain faster, sometimes dying sooner than expected. To prevent issues, regularly check the battery level via the app and establish a rule to replace batteries once the level drops below 30%. Asking your cleaning team to check battery levels as part of their routine can also help prevent forgotten replacements. Some products feature a USB port for external power, which can serve as a useful emergency backup.

Handling Cases Where Guests Can’t Unlock the Door

Issues such as incorrect PIN entry, network problems, or app glitches occasionally prevent guests from unlocking the door. In actual vacation rental operations, unlocking issues are reported at a rate of roughly 1–3 incidents per 100 stays. Effective countermeasures include: providing photo-illustrated instructions in your check-in guide, listing a 24-hour emergency contact number, and keeping a physical key on hand as a backup. Preparing multilingual instruction manuals can also significantly reduce trouble with international guests—at a minimum, English, Chinese, and Korean versions are recommended.

Preparing for Malfunctions and Deterioration

Since smart locks are precision devices, wear and tear or failures due to external factors are inevitable over time. Adhesive-type locks in particular can lose their grip in hot, humid conditions, and there have been reports of lock units falling off in summer. While warranty periods typically run 1–2 years, vacation rentals see heavier use from a wide variety of people, accelerating wear—so consider replacement every 2–3 years as a general guideline. It’s also worth keeping a spare unit of the same model on hand, allowing for immediate replacement if a failure occurs and minimizing disruption to guests.

Estimated Costs for Smart Lock Installation

Initial Costs

Smart lock unit prices typically run ¥10,000–¥20,000 for adhesive-type models, ¥30,000–¥70,000 for cylinder replacement models, and ¥50,000–¥150,000 for drilled installation models. On top of this, you should budget ¥3,000–¥5,000 for a Wi-Fi hub, ¥20,000–¥40,000 for an identity verification tablet, and roughly ¥0–¥30,000 for identity verification system setup fees. If you go with an adhesive-type lock, you can get started with a minimal setup for around ¥50,000–¥80,000.

Ongoing Costs

Battery costs typically run around ¥1,000–¥2,000 per year, which isn’t a significant burden. However, identity verification systems usually carry a monthly fee of ¥1,000–¥5,000, and Wi-Fi service costs another ¥3,000–¥5,000 per month, so it’s important not to evaluate costs based on the smart lock alone. Plan for total annual running costs of roughly ¥50,000–¥100,000. That said, when you factor in the elimination of staffing costs for in-person key handovers and cylinder replacement fees from lost keys, most operators recoup their investment within the first year.

Keys to a Successful Rollout

Integration With Your Existing PMS and Booking Systems

To maximize the operational efficiency of your smart lock, integrating it with your PMS (property management system) or booking platforms is key. Some products—such as RemoteLOCK, Keeyls, and Linotte—automatically sync with reservation data from Airbnb and Booking.com, generating one-time passcodes tailored to each booking period. This automation eliminates the need to manually generate and send PIN codes every time, and prevents human errors such as forgetting to send a code. For properties with 300+ bookings a year, this kind of automated integration alone can save 5–10 hours of work per month.

Building Coordination With Your Cleaning Team

Once a smart lock is installed, your cleaning staff will also need a dedicated way to unlock the door. It’s common practice to set up a master code exclusively for cleaning staff, or to issue time-limited passcodes. Have your cleaning team report on the lock’s condition each time they enter and exit—battery level, any issues with door opening/closing, dirt or wear on the keypad, and so on. Building this kind of on-site check into daily routines helps you catch early warning signs of malfunctions or trouble before they escalate.

For Help With Smart Lock Installation in Your Vacation Rental, Turn to Stay Buddy Inc.

From selecting and installing the right smart lock, to integrating identity verification systems, to building out your operational workflows, establishing an unattended check-in system for your vacation rental requires specialized expertise. Stay Buddy Inc. is a professional vacation rental management company with a proven track record of supporting smart lock installation and operation across numerous properties.

We provide a one-stop solution covering everything you need for successful operations: recommending the optimal product based on your property’s location and door type, building a check-in system that satisfies legal requirements, and coordinating with your cleaning team. If you’re unsure which product to choose, or want to switch to unattended operations but don’t know where to start, please feel free to reach out to us.

Stay Buddy Inc. offers a free initial consultation. After learning about your current operations, we’ll propose the smart lock installation plan best suited to your needs. Please don’t hesitate to get in touch via our contact form or by phone.