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Best Smart Locks for Apartments: No Drilling

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Three retrofit smart locks that keep the building's key and your deposit: August, SwitchBot and Yale compared.

Best Smart Locks for Apartments: No Drilling
Before you buy: the deployment details that decide fit.
Model Power Protocol Hub Subscription Local control
August Wi-Fi Smart Lock Battery Wi-Fi + Bluetooth No No Hybrid
SwitchBot Lock Pro Battery Bluetooth + Matter via hub Optional hub No Hybrid
Yale Approach Lock Battery Bluetooth + Wi-Fi bridge Included bridge No Hybrid

Local keeps working without the vendor cloud. Hybrid controls locally but uses the cloud for remote access. Cloud needs an account and internet for remote use.

Section 1: Which smart locks let renters keep the existing key? (Introduction)

The best smart locks for apartments are retrofit models that keep the building’s outside key and replace only the interior thumb-turn. August Wi-Fi, SwitchBot Lock Pro and Yale Approach are the three worth comparing, and none requires drilling or a new outside key.

A smart lock for a house is a project. A smart lock for an apartment is a negotiation. The door belongs to the building, the exterior keyway is often controlled by the landlord, and the fire code may treat the door as part of the means of escape. Replacing the deadbolt is the wrong first move for most renters.

The right category is the retrofit lock. It mounts on the inside of the door, over the existing deadbolt, and turns the thumbturn with a motor. The exterior key and the building’s master key still work. You do not drill, you do not change the cylinder, and you can remove it when you leave.

That constraint narrows the market to a handful of products. The three below are the ones worth comparing for an apartment: August Wi-Fi, SwitchBot Lock Pro and Yale Approach. Each keeps the outside key. Each can be removed. None is a substitute for a landlord conversation if the door is a fire door or the building has rules about hardware.

This guide is for renters, but it also fits anyone who does not want to touch the door. If you own a house and the deadbolt is standard, a full replacement gives more features for the same money. For an apartment, the retrofit is the only sane default.

Section 2: Will a retrofit smart lock fit my apartment door?

It fits a door with a standard deadbolt thumbturn you can remove; a deadbolt built into a handleset or a mortise lock is the case where it does not.

A retrofit lock replaces the interior thumbturn with a motorized unit. The exterior trim and keyway stay. That is the whole idea, and it is why the category exists.

Three things have to be true before you buy:

The deadbolt has a thumbturn you can remove. Most apartment deadbolts do. Some are integrated into a handleset or a mortise lock, and those are not candidates. Take a photo of the inside plate and the door edge before ordering.

The door closes and locks smoothly by hand. A motor cannot fix a door that is out of alignment. If the bolt rubs the strike plate, fix that first. A smart lock on a binding door will drain batteries and fail at the worst time.

The landlord or building allows it. A retrofit is less invasive than a replacement, but a fire door, a heritage door or a building with a master-key system may have rules. Ask. The answer is usually yes for an interior-mounted retrofit; the point is to ask before the fee.

The exterior key is the safety net. If the battery dies, the motor jams or the app loses its account, the key still works. Do not buy a retrofit that requires you to replace the exterior cylinder; that is a different product and a different permission.

In a building with a master-key system, the exterior cylinder is part of the building’s access control. Replacing it can lock out maintenance staff and violate the lease. A retrofit that leaves the cylinder untouched avoids that problem entirely. That is the main reason this category exists for renters.

One more rule: keep the original thumbturn and screws in a bag. When you move out, put the old hardware back. The next tenant and the landlord will thank you, and the deposit is safer.

Section 3: How do August, SwitchBot and Yale retrofit locks compare?

The August is the most polished at $199.99, the SwitchBot is the cheapest entry at $119.99 but needs a hub for remote access, and the Yale at $129.99 is the keypad pick with a Wi-Fi bridge in the bundle.

Model Price Power Remote access Best for
August Wi-Fi Smart Lock $199.99 4 AA batteries Built-in Wi-Fi Apple and Google households
SwitchBot Lock Pro $119.99 Battery Hub required Budget retrofit
Yale Approach Lock $129.99 4 AA batteries Included Wi-Fi bridge Keypad entry

August Wi-Fi Smart Lock

The August is the most polished retrofit at $199.99. It replaces the interior thumbturn, keeps the outside key, and connects over Wi-Fi without a separate bridge. It works with Apple Home, Google Home, Alexa and the August app. Battery life is up to three months, which is shorter than the others, and the motor is audible. The price is the highest here, but it is the simplest for a household that wants one app and no hub.

SwitchBot Lock Pro

The SwitchBot is the budget pick at $119.99. It mounts over the existing deadbolt and keeps the key. Bluetooth control is local; remote access and Matter need a SwitchBot Hub, sold separately. The keypad and fingerprint reader are also add-ons, so the $119.99 is the starting point, not the finished system. For a renter who only needs phone control at the door, it is the cheapest way in.

Yale Approach Lock

The Yale Approach is a retrofit at $129.99 with a keypad option and an included Wi-Fi bridge in the bundle. It keeps the outside key and works with the Yale app, Apple Home, Google Home and Alexa. The keypad is the reason to choose it: a code for a guest or a cleaner without handing over a phone. Check which bundle includes the keypad and the bridge; the base lock may not.

Prices are typical U.S. retail, checked October 2026. They move with bundles and sales, and the accessories change the real cost.

Section 4: Which retrofit lock fits your budget and access needs?

Buy the August if: you want the shortest setup, you use Apple Home or Google Home, and you are willing to pay for the polish. It is the best fit for a household that wants the lock to disappear into the app.

Buy the SwitchBot if: the budget is tight, you only need Bluetooth at the door, and you are willing to add a hub later. It is the best first smart lock for a renter who is not sure how much they will use remote access.

Buy the Yale if: you need a keypad code for guests, a cleaner or a dog walker. The code is the feature that makes a smart lock useful to people who do not have the app. The included bridge makes remote access simpler than the SwitchBot route.

Skip all three if: your building forbids interior hardware, your door has an integrated handleset, or you need a lock that works with a building-wide access system. In those cases, a keypad safe or a lockbox is the better spend, and it does not touch the door.

One more case: a door with a deadbolt above a handle, where the interior thumbturn is recessed. Some retrofits do not fit a recessed trim. Measure the space between the thumbturn and the door edge before ordering.

Section 5: How do you install a retrofit lock, and does it work offline?

Installation is a screwdriver job, and the lock keeps working offline only if the code lives on the lock rather than in the cloud.

Photograph the existing hardware. Take a photo of the interior plate, the door edge and the strike plate before you remove anything. The original screws are easy to lose.

Check the backset. The backset is the distance from the door edge to the center of the deadbolt. Most U.S. doors are 2-3/8 or 2-3/4 inches. The retrofit needs to fit the existing thumbturn, not the backset, but the adapter plates vary. The product page lists compatibility.

Do not over-tighten. A retrofit clamps onto the thumbturn. Over-tightening can bind the mechanism or crack the interior trim. Follow the torque in the instructions, which is usually “snug, then stop”.

Calibrate the lock. Most apps ask the lock to learn the locked and unlocked positions. Run the calibration with the door open, then close the door and test. If the bolt rubs the strike, adjust the strike plate before blaming the lock.

Check the door closer. Many apartment doors have a self-closing arm. The closer can pull the door before the bolt extends, which makes the lock bind. If the door slams or drifts, adjust the closer or ask maintenance. A retrofit cannot fix a door that moves on its own, and no app setting will compensate for a bad closer. That is a five-minute check with the door open.

Run the offline test. Lock and unlock with the key, the thumbturn, the app and a code. Then unplug the router and repeat. The key and the thumbturn must work. The app should fail gracefully. A code that only exists in the cloud may fail; a code stored on the lock should work. That difference matters in a building with unreliable internet, and it is the first thing to test after installation.

Check the battery type. Use the cells the manufacturer specifies. Mixing old and new batteries, or using rechargeable cells with a lower voltage, causes intermittent failures that look like app bugs.

Section 6: Is a retrofit smart lock worth it for your apartment? (Conclusion)

What a retrofit lock does and does not protect

A retrofit lock does not make an apartment door more secure. It makes it more convenient. The deadbolt, the strike plate and the frame still decide whether someone can kick the door in. In a rental, you usually cannot change those. Be honest about that before spending $200.

The security gains are real but narrow: a code can be revoked without changing the building key, an activity log shows when the door was opened, and auto-lock can prevent a door left open. Those are useful. They are not a substitute for a solid door and a landlord who maintains it.

Renters insurance may offer a discount for a smart lock, but do not buy one for the discount. The amounts are small and the eligibility varies by insurer and state. Ask your agent with the model number in hand, and keep the receipt. If the discount does not appear, the lock still has to make sense on its own.

Three-year costs

The three-year cost is the hardware plus batteries. None of these requires a subscription. August and Yale include remote access in the lock; SwitchBot needs a hub for it. Add the hub and a keypad to the SwitchBot and the price gap narrows quickly.

The verdict: August for the simplest Apple or Google household, SwitchBot for the lowest entry price, Yale for the keypad. All three keep the building’s key and leave the door as they found it, which is the only kind of smart lock a renter should buy. If the landlord says no, respect it; a lock is not worth the deposit.

Where to buy

Research-based picks, checked October 2026. We have not tested these units ourselves.

As an Amazon Associate, we earn from qualifying purchases. Prices are typical U.S. retail, checked October 2026, and change often. Each link opens an Amazon search for the exact model.

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