Will a Smart Lock Fit My Door? Compatibility Checker
Nothing's worse than unboxing a smart lock and discovering it doesn't fit your door. Deadbolts, door thickness, and backset measurements all matter — and most product pages bury the requirements in fine print.
Answer three quick questions about your door and this checker will tell you straight up whether a no-drill retrofit smart lock will work, what to measure if you're unsure, and which locks to buy for your situation. Renters, this one's especially for you: retrofit locks install in minutes without drilling and come off cleanly when you move.
Will a Smart Lock Fit Your Door?
Answer three quick questions and we’ll tell you whether a no-drill retrofit smart lock will work on your door — before you buy.
Most retrofit smart locks assume a standard 2-1/8 inch bore hole (the big round hole the deadbolt sits in). If your door was drilled for a standard deadbolt, you’re almost certainly fine — measure to be sure before ordering.
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Frequently asked questions
What is a retrofit smart lock?
A retrofit (or “no-drill”) smart lock replaces only the interior thumb-turn of your existing deadbolt, leaving the outside hardware and your physical keys untouched. August and SwitchBot are the best-known examples. Installation takes about 10 minutes with a screwdriver.
What backset do most smart locks need?
Most retrofit smart locks support the two standard North American backsets: 2-3/8 inch and 2-3/4 inch. Measure from the edge of the door to the center of the deadbolt hole.
Can I install a smart lock as a renter?
Yes — that’s exactly what retrofit smart locks are for. They don’t drill new holes or change the outside of the door, so most landlords are fine with them, and you can remove them in minutes when you move out.
Will a smart lock work on a double-cylinder deadbolt?
Generally no — retrofit smart locks need a thumb-turn on the inside, and double-cylinder deadbolts (keyed on both sides) don’t have one. Your options are swapping to a single-cylinder deadbolt first, or choosing a full-replacement smart deadbolt.
How thick can my door be for a smart lock?
Most retrofit smart locks fit standard doors from 1-3/8 inch to 1-3/4 inch thick, which covers the vast majority of homes. Thinner or thicker doors need brand-specific adapter kits or a full-replacement lock.