One smart lock install runs $180 to $420 and then costs you nothing at each turnover. Traditional rekeying runs $25 to $40 per cylinder, per tenant, forever. On a three-turnover stretch with two keyed locks, smart locks break even by the second tenant and pay for themselves after that.
That’s the core math. The rest of this guide covers California’s legal baseline for rental unit security, what you can and cannot do to a current tenant’s access, which lock types work best for different rental scenarios, and how to set policy so your tenants aren’t frustrated by the technology.
The California legal baseline
California Civil Code Section 1941.3 requires that rental units have operable deadbolts on every door that connects the unit to the outside or to a common area. The deadbolts must function correctly, and the landlord is responsible for maintaining them throughout the tenancy.
That statutory baseline covers traditional deadbolts fine. Smart locks, including keypad and Wi-Fi deadbolts, meet the mechanical deadbolt requirement as long as they have a physical key cylinder as a backup. Every smart lock we recommend for rental use has one. A keypad-only device with no physical override is a different story, and that’s one reason we don’t recommend those for rentals.
On rekeying between tenants: while California doesn’t mandate it for residential rentals the way some other states do, it’s the standard practice for obvious reasons. A departing tenant may have made copies, left a key with someone, or simply not returned everything. Smart locks make this a non-issue, you change the code, the old tenant’s credentials stop working instantly, and you don’t need a locksmith visit to do it.
This is general information about publicly available California law. It is not legal advice. Your specific situation, lease language, and local ordinances may differ. Talk to your attorney if you have questions about your obligations as a landlord.
The turnover cost math
The financial case for smart locks is strongest over a multi-year horizon. Here’s how it plays out on a single rental unit with two exterior keyed locks.
| Scenario | Year 1 | Year 2 | Year 3 | 3-Year Total |
|---|---|---|---|---|
| Traditional rekey ($35/cylinder x 2 locks per turnover) | $70 | $70 | $70 | $210 (assumes 1 turnover/yr) |
| Traditional rekey, 2 turnovers in a year | $140 | $70 | $70 | $280 |
| Smart lock install ($300 hardware + $120 labor) | $420 | $0 | $0 | $420 |
| Smart lock install, code changes after each turnover | $420 | $0 | $0 | $420 |
On one turnover per year, a smart lock breaks even around year three and pays for itself after that. With two turnovers in year one, it’s closer to break-even by year two. The more churn your property sees, the faster the math works in your favor.
There’s also the friction cost that doesn’t show up in that table: scheduling a locksmith visit, coordinating key pickup, making sure a new set of keys gets to your tenant. With a smart lock, you change the code from your phone and text it to the incoming tenant. That’s it.
For a deeper look at when rekeying makes more sense than replacing hardware, the post on rekey vs. replace when moving in is worth reading.
What you may NOT do to a current tenant
This section matters more than the cost math. Get it wrong and you’re facing an illegal lockout claim.
Changing a current tenant’s door code is an illegal lockout in California. It doesn’t matter that the lock is a smart lock, that you’re the property owner, or that you have a dispute with the tenant. California law prohibits landlords from “willfully and unlawfully” removing a tenant’s means of entry. Changing an access code on an occupied unit while the tenancy is active falls under that prohibition.
This includes:
- Changing the keypad code without the tenant’s knowledge or consent
- Deleting a tenant’s app access while they still have a valid tenancy
- Disabling the lock remotely
The only legal ways to change a tenant’s access are through a court-ordered eviction process or by mutual written agreement.
The practical implication for smart lock landlords: only change codes at turnover, after possession has been legally returned. Don’t use the remote-access feature to lock someone out during a dispute, even if you believe the tenancy has ended. Consult an attorney before taking any action on access if there’s a dispute.
On a related note, tenant privacy questions can arise if the lock’s audit trail logs entries to a cloud account you control. Some tenants are uncomfortable with a landlord having visibility into every time they come and go. Being transparent about this in the lease, and considering whether you actually need that feature, goes a long way.
Picks by property type
Not every rental situation calls for the same lock. Here’s what we typically recommend.
Single-family home, traditional tenancy. A Schlage Encode Plus or Kwikset Halo is the right choice. Both have built-in Wi-Fi, solid battery life, a physical key cylinder, and good apps for code management. The Schlage is the better-built lock. The Kwikset is a reliable option at a lower price point. Either one supports per-tenant access codes that you can delete at turnover. See our full comparison in best smart locks for San Diego homes in 2026.
Multi-unit building. If you’re managing four or more units, a Z-Wave or Zigbee lock (like the Yale Assure Lock 2 with a SmartThings hub) scales better than individual Wi-Fi locks. You manage every unit from one platform. The upfront cost is higher, but you get centralized code control and audit logs across the whole property.
Short-term or vacation rental. The Yale Assure Lock 2 is the strong choice here because its app integrates with Airbnb and VRBO to auto-generate time-limited codes that expire when a guest’s booking ends. No manual code changes required. Our smart lock installation team works with short-term rental owners across San Diego County on exactly this setup.
Accessory dwelling unit (ADU). Same calculus as a single-family home, but pay attention to the Wi-Fi signal. ADUs on the rear of a lot are often at the edge of the main house’s network. Test signal strength at the door before buying, or plan to add a Wi-Fi extender. A lock that can’t hold a reliable connection loses most of its smart functionality.
Tenant experience considerations
A smart lock is only a good landlord choice if your tenants can use it without frustration. A few things to think through before you install.
Tenants cannot be forced to use keyless-only access. Every lock you install on a rental should have a physical key cylinder. This isn’t just a legal recommendation, it’s a practical one. Not every tenant is comfortable relying on a battery-powered device as their only means of entry. The physical key is the backup they need, and under California’s habitability standards, accessible entry to the unit is a landlord obligation.
Be clear about who manages the codes. If you want to control code issuance, say so in the lease. If you’re willing to let a tenant add their own codes for family members, set that expectation in writing too. Ambiguity leads to disputes.
What happens when the Wi-Fi is off. The lock still works. The keypad and physical key operate independently of internet connectivity. What stops working during an outage is remote access and code management from your phone. The tenant can always enter with their code or physical key. This is worth explaining upfront so a tenant doesn’t panic during the next power or internet outage.
Battery responsibility. Set this in the lease. Our recommendation: the landlord replaces batteries at every turnover and is responsible for a mid-tenancy failure if the tenant notifies you in advance. Most good smart locks give 30 to 60 days of low-battery warnings before they stop working, so there’s plenty of lead time. A lock rekey at turnover paired with a fresh battery swap is a clean reset protocol.
Maintenance and battery policy
A good maintenance policy for a smart lock rental has three parts.
First, check the lock physically during every property inspection. A smart lock that’s slightly misaligned doesn’t fail visibly, it just drains batteries faster and eventually burns out the motor. A locksmith can adjust the strike plate in 15 minutes. Catching that early is far cheaper than a motor replacement.
Second, change the batteries at every turnover, not on a calendar schedule. Battery life varies with temperature (cold weather shortens it), usage frequency, and alignment. Starting a new tenant with a fresh battery set means at least 6 to 12 months before the next one is needed.
Third, log the install date and the lock model somewhere in your property records. Smart locks have firmware updates. The major brands (Schlage, Yale, Kwikset) push them automatically over Wi-Fi. Cheaper or less-supported locks stop getting updates after a few years. Knowing what you have and when you installed it lets you plan for replacement before the lock becomes a liability.
Frequently asked questions
Can a landlord install a smart lock in California?
Yes. California law requires operable deadbolts on rental units. Smart locks with a physical key cylinder meet that requirement. You can install a smart lock on a rental unit as long as the tenant retains a working physical key. A keypad-only lock with no key override is harder to justify under habitability law and creates a practical problem if batteries die.
Can a landlord change the door code on a current tenant?
No. Changing the access code on an occupied unit, without the tenant’s knowledge and consent, is an illegal lockout under California law. It doesn’t matter whether the lock is a smart lock, a traditional deadbolt, or anything else. The only time you can change access credentials is after the tenancy has ended and possession has been returned. If there’s a dispute about whether the tenancy has ended, you need a court order, not a code change. Consult an attorney.
Who pays for smart lock batteries in a rental?
This is a lease negotiation, not a statutory rule. The most common approach is for the landlord to replace batteries at turnover and for the tenant to replace them during the tenancy if a failure occurs. Some landlords include battery replacement as a landlord responsibility throughout, which is the more tenant-friendly policy. Whatever you decide, put it in writing in the lease so there’s no dispute later.
What if a tenant wants to add their own code for a family member?
That’s worth addressing in the lease. If you control the lock through an app, you can decide whether to grant the tenant sub-user access to add their own codes. If you don’t want to share that capability, say so upfront. Tenants can’t independently modify a smart lock’s code database the way they might copy a physical key, so the issue doesn’t arise without your involvement unless you explicitly give them access to the account.
What happens to the smart lock when a tenant moves out and I haven’t changed the code yet?
Until you change the code, the outgoing tenant’s credentials still work. Treat code rotation at turnover the same way you’d treat key collection: do it before the new tenant moves in. Most smart locks let you delete individual codes without affecting others, so you can clear the previous tenant’s code while keeping your own management code active. Don’t hand the unit to a new tenant without doing this first.
Is a smart lock more secure than a traditional deadbolt for a rental?
It depends on the lock grade, not the technology. A Grade 1 smart deadbolt (Schlage Encode, Yale Assure Lock 2) is as secure as a Grade 1 traditional deadbolt. The smart features add convenience; they don’t fundamentally change the physical security. If security is the primary concern, focus on Grade 1 hardware and a properly installed strike plate. Our post on choosing a Grade 1 deadbolt covers the hardware side in detail.
If you’re managing San Diego County rentals and want help choosing and installing the right smart lock for your property type, call us at (858) 925-5546. We’ll walk you through the options, install it correctly, and make sure the battery life and alignment are right before we leave.