Data as of Oct 10, 2026A topic in Smart Locks & Keyless Entry Systems.
Reviewed by Dimitry Apollonsky
Mentioned in · Jul 7 – Oct 10, 2026
ChatGPT SearchOct 10, 2026
You want a retrofit smart lock — one that works with your existing deadbolt instead of replacing the entire lock. That means you can often keep your current keys, exterior hardware, and door appearance.
My recommendation is to start with the August Wi-Fi Smart Lock or SwitchBot Lock Pro. Both are designed to motorize an existing deadbolt from the inside, though compatibility depends on your specific lock.
Google AI ModeOct 10, 2026
Are there any smart locks I can install that let me keep my current deadbolt hardware?
I want to upgrade to a smart lock but keep my current deadbolt hardware in place. What are my options?
(Best overall for simplicity)
Typical listed price: around $200
Fits over the inside thumbturn of a compatible deadbolt, leaving the outside lock and physical key unchanged. Built-in Wi-Fi lets you lock or unlock remotely without a separate Wi-Fi bridge.
Remote locking and unlocking
Auto-unlock and activity history
Relatively bulky; check battery costs
(Best for flexibility)
Typical price: around $100 for the lock alone
A retrofit motor with adjustable mounting adapters, making it worth considering if your deadbolt has an unusual thumbturn shape. Optional accessories add keypad entry and remote smart-home features.
Keeps existing exterior hardware
Expandable with accessories
A hub may be needed for remote access
Typical listed price: around $140–$180, depending on bundle
Another interior-only retrofit option. It preserves your existing key and can be paired with a keypad for keyless entry. Wi-Fi availability and included accessories vary by package.
Discreet retrofit installation
Optional keypad access
Verify whether the bridge or keypad is included
Listed price: around $199
The most discreet option: its electronics fit inside a compatible deadbolt, so the inside thumbturn and outside key hardware can remain visually unchanged. It requires more careful compatibility checking than a typical thumbturn-mounted lock.
No bulky motor attached to the door
Matter over Thread smart-home support
Existing deadbolt must be compatible
The most important thing is whether your existing deadbolt has a standard interior thumbturn. Before buying, check that the door locks smoothly by hand and that there is enough clearance around the thumbturn for a motorized unit.
One question: Can you send me a photo of your current deadbolt from the inside of the door? I can use that to help narrow down which models are most likely to fit.
If you can't send a photo, tell me the brand printed on the lock (such as Schlage or Kwikset), and I'll start there.
To keep your current keys and exterior hardware while adding smart capabilities, you need a retrofit smart lock that attaches to the inside of your door and turns your existing deadbolt mechanism.
Watch this overview to see how retrofit locks compare and fit onto doors without changing exterior hardware:
3:24 Best Smart Lock 2026: Retrofit or Replace?11 days ago YouTube · Buying Brief
Installs completely hidden inside your door , replacing your existing deadbolt's internal bolt mechanism while keeping your outside keyhole and hardware 100% unchanged. It supports smart platforms via Level Home.
Mounts over your existing interior thumbturn on most standard single-cylinder deadbolts. It lets you continue using your outside key while upgrading the inside with app controls and auto-unlock features available through August Home.
Attaches to the inside thumbturn of your current deadbolt setup for a budget-friendly retrofit installation that leaves the exterior keyhole untouched.[2]
If you can share which smart home system you use (like Apple Home, Alexa, or Google Home) and whether you prefer an interior-only hidden lock or a thumbturn overlay, I can recommend the exact match for your door.
