Smart Locks for Renters: Keep the Landlord's Key, Lose Yours (2026)

Renting is the case smart-lock marketing forgets: you can’t rekey the door, the landlord’s key must keep working, and whatever you install has to come off without a trace at move-out. Retrofit locks solve all three by replacing only the inside thumbturn. Our library has four paths, with facts from the same audited records behind the compatibility checker, catches included.

The three true retrofits

• August WiFi (4th gen) ($199.99), the classic. Full Alexa/Google/Apple/SmartThings support, WiFi built in, exterior untouched. Its record’s catch is maintenance, not fit: ~3-month battery life (the #1 owner complaint) and cloud dependence for remote control. Corrected 2026-08-07: this page carried a lower price until we re-checked August’s own store. At the real price the August is no longer the cheapest of the three here. The Aqara is. If you picked the August on cost, it’s worth a second look.
• SwitchBot Lock Ultra Vision Pro Combo ($279.99), the biometric one: face + palm + fingerprint, ~12-month rechargeable pack, layered dead-battery backups. Read the name carefully, because it is a bundle rather than a lock: the price covers the Lock Ultra, the Vision Pro keypad and the Hub Mini Matter together. That matters both ways. The hub everything beyond Bluetooth range depends on is already included here, while the bare lock costs considerably less and leaves you budgeting for one. We corrected this entry on 2026-08-08, because the price it previously carried matched none of the seven configurations SwitchBot actually sells.
• Aqara U200 ($169.99), the fullest compatibility table of the three (full marks in all five ecosystems, Apple Home Key included) plus a fingerprint keypad. Two catches from its record: it has no Wi-Fi, so every ecosystem connects through a Thread border router. And retrofit fit depends on your existing deadbolt’s geometry, so measure before buying.

The invisible fourth option

The Level Lock Pro ($349) replaces the entire deadbolt but looks like nothing happened: the mechanism lives inside the door, keyway intact, full five-ecosystem support, local-first via Thread. For renters it’s the “comfortable with a hardware swap” option: reversible, but with actual reinstallation at move-out, and its record flags that remote access needs a Thread border router or Level’s bridge.

Renter reality checks

The dead-battery story is your friend here. Because the exterior keyway survives on all four, a dead battery means “use the key,” never a lockout: the failure mode that haunts key-free replacement locks (per-model details in the dead-battery guide). Move-out is a screwdriver job on the three true retrofits, so keep the original thumbturn parts. And the lease conversation is easier than it sounds: nothing about the landlord’s key changes. For the full category table, including the owner-grade replacement locks these were the alternative to, see the smart lock directory, or run your ecosystems through the checker first.