
The retrofit answer to the apartment problem: it mounts over your existing deadbolt's thumb turn, so the building's hardware and your physical keys stay intact and the whole unit unscrews when you move. PCMag rates it 4.5 Outstanding (Best Retrofit), CNET calls it the retrofit benchmark, and CNET's buying guide says retrofit locks like this 'can sometimes be a better fit for apartments, where the building owners might not allow you to replace the entire lock.'
| # | Product | Recommended By | Best For | Price |
|---|---|---|---|---|
| 1 | August Wi-Fi Smart Lock | 2/3 reviewers | leases that forbid swapping the deadbolt | $146-229 |
| 2 | Yale Approach Lock with Wi-Fi + Keypad | 1/3 reviewers | renters who want a keypad without touching the exterior lock | $170-180 |
| 3 | Schlage Encode Smart WiFi Lever | 2/3 reviewers | apartment doors with a knob or lever and no deadbolt | $246-259 |
| 4 | Yale Assure Lock 2 (Wi-Fi + Keypad) | 3/3 reviewers | full-replacement installs where the lease allows it | $195-240 |
| 5 | Eufy Smart Lock C34 | 1/3 reviewers | the cheapest hub-free smart upgrade for a first apartment | $100-140 |

PCMag's Best Retrofit (4.5 Outstanding) and CNET's retrofit pick - auto-locking, DoorSense open/close alerts and guest passes with deadlines, all while keeping the landlord's lock hardware. CNET's honest trade-offs for apartment life: the interior unit is still bulky on a thin apartment door, no full Matter yet, and its testing clocked rechargeable battery life at up to 3 months.
Best for: leases that forbid swapping the deadbolt - $146-229

Wirecutter's top adapter pick, sold at $180 through Yale: four cam adapters fit almost any single-cylinder deadbolt, installation took its tester 'a couple of minutes', and the shallow rounded design is the best-looking retrofit tested. The DoorSense module matters in walk-ups - it stops auto-lock firing while the front door stands propped. No Apple Home, which Wirecutter notes as its one real gap.
Best for: renters who want a keypad without touching the exterior lock - $170-180

The pick for the many apartment entry doors that have only a single bore: Wirecutter's doorknob-replacement top pick ($259, 'nearly identical' to its deadbolt winner) and CNET's best handle ($246, Grade 1/AAA). Inside passage-mode buttons beat app-only toggling - Wirecutter's tester tells of being locked out of a kid's room by a rival's auto-lock. No Apple support on the lever, and it is among the priciest formats.
Best for: apartment doors with a knob or lever and no deadbolt - $246-259

The unanimous recommendation (CNET best overall 9/10, Wirecutter runner-up, PCMag's affordable HomeKit option 4.0) with a keyway so battery or Wi-Fi failure never strands you in a building where nobody has a spare key. Apartment caveats from the benches: PCMag lists weak Wi-Fi battery life and a short low-battery warning, and Wirecutter's tester fought flush alignment across three installs.
Best for: full-replacement installs where the lease allows it - $195-240

Wirecutter's budget pick: 'simple, reliable... it just works', one of the quietest tested (real consideration through thin apartment doors), built-in Wi-Fi with no hub, Matter support, listed at $140 and regularly under $100. The fine print for renters: BHMA Grade 3 is residential-minimum hardware and the interior housing is huskier than most.
Best for: the cheapest hub-free smart upgrade for a first apartment - $100-140
We compared 5 products. August Wi-Fi Smart Lock won overall โ the rest are strong in narrower niches:

The retrofit answer to the apartment problem: it mounts over your existing deadbolt's thumb turn, so the building's hardware and your physical keys stay intact and the whole unit unscrews when you move. PCMag rates it 4.5 Outstanding (Best Retrofit), CNET calls it the retrofit benchmark, and CNET's buying guide says retrofit locks like this 'can sometimes be a better fit for apartments, where the building owners might not allow you to replace the entire lock.'
$146-229
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