About three years ago, one of my tenants installed a smart lock on her unit’s front door without asking me first. I only found out when the moving company called about a mismatched key at move-out. That single incident cost me a locksmith visit, a delayed handover, and roughly 8,000 yen in unexpected fees. Since then I’ve written a clear smart home device policy into every lease across all 9 of my properties, and it has saved me from at least a dozen similar headaches.
Smart plugs, video doorbells, smart locks, and voice assistant speakers are showing up in more and more of my units, especially with tenants under 35. If you don’t set rules in advance, you end up negotiating after the fact, usually at the worst possible moment, like during a move-out inspection.
Why Tenants Want Smart Devices in the First Place
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In my experience managing rentals for over 15 years, the requests fall into a few predictable categories: security (doorbell cameras, smart locks), convenience (smart plugs for lighting, robot vacuum docks), and energy savings (smart thermostats, though these are less common in Japanese rentals with individual room air conditioners). Roughly a third of my tenant inquiries about renovations or modifications now involve some kind of connected device rather than paint or flooring. I’ve watched this shift happen gradually over the last 5 or 6 years, and it’s not slowing down, so ignoring it isn’t really an option anymore for any landlord managing multiple units.
Devices I Allow Without Prior Approval
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I’ve learned it’s not worth fighting tenants over low-risk devices. These plug into an existing outlet, require no drilling, and leave zero trace when removed. My lease explicitly lists what’s fine without asking:
- Smart plugs and power strips (no wiring changes)
- Bluetooth or WiFi speakers, including voice assistants
- Battery-powered smart doorbell cameras that use adhesive mounts, not screws
- Smart bulbs that screw into existing fixtures
- Portable smart thermostats that sit on a table rather than replacing a wall unit
Listing these explicitly cuts down on the emails I get asking permission for something completely harmless. It also builds goodwill early in the tenancy, which matters when I need cooperation later for inspections or repairs.
Devices That Require My Written Sign-Off First
Anything that touches wiring, the door lock mechanism, or the building’s exterior needs approval before installation, no exceptions. That covers hardwired smart locks, video doorbells that replace the existing chime wiring, smart switches that go inside the wall plate, and any device requiring a hole drilled through an exterior wall for a sensor or camera. I ask for the model number and a link to the installation manual before I approve anything in this category, because some smart locks are genuinely difficult to reverse without damaging the original strike plate.
Out of roughly 40 requests I’ve fielded over the past five years for hardwired devices, I’ve approved about 30 of them, usually after confirming the tenant will restore the original hardware at move-out. The other 10 I declined, mostly smart lock models that would have required cutting into a door I’d need to replace entirely rather than just re-keying.
The Restoration Clause That Protects Your Deposit Process
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Every approval I give comes with one condition in writing: the tenant restores the unit to its original state before handing back the keys, and keeps the original hardware in a labeled bag for exactly this purpose. I actually require tenants to photograph the original doorbell or lock before removal and send me the photo, so there’s no dispute later about what standard fixture should go back on.
When a tenant fails to restore the original setup, I deduct the actual replacement cost from the security deposit rather than guessing at a number. My last deduction for an unreturned smart lock was 12,000 yen, which is roughly what a mid-range keyed deadbolt costs installed. Having a documented before-photo made that deduction painless; the tenant didn’t dispute it at all.
Network and Privacy Considerations I Now Address Upfront
A few years back I hadn’t thought about this angle at all, until a tenant asked whether her video doorbell’s cloud recordings could somehow implicate the building’s shared entryway. Now my policy explicitly states that any camera-equipped device must have its field of view limited to the tenant’s own unit and entry, not shared hallways or the parking area. I also require that any device connecting to the unit’s internet service be registered under the tenant’s own account, never the building’s shared network if I provide one, so there’s a clean line of responsibility if something goes wrong technically.
Building the Policy Into the Lease Itself
None of this works as a verbal understanding. I add a dedicated clause, usually about half a page, that spells out the three tiers above: freely allowed, approval required, and prohibited outright (structural changes, anything requiring a permit, or shared-area equipment). I also attach a one-page addendum tenants sign separately when they request a hardwired device, which keeps the paperwork simple for the 90 percent of tenants who never touch anything beyond a smart plug.
Since putting this system in place, my average time spent on smart device disputes has dropped from what used to be an hour or two per incident to almost nothing. Tenants read the clause, know exactly where they stand, and either ask before drilling or don’t bother at all. That’s the approach I use across all 9 of my properties, and it’s one of the simplest policy changes that’s actually paid for itself many times over.
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15 years of landlord experience u00b7 3 apartment buildings u00b7 DIY renovations that saved millions of yen. Browse all articles at diytosan.com
