Identify Your Door & Lock

Before choosing a smart lock, work out what the door and existing lock require it to do. A familiar label such as “deadbolt” or “multipoint” is only a starting point: the exact model, door preparation, clearances, key function, and locking sequence can change the result.

Start with the action your lock performs. Then use the relevant guides to measure the door, check a North American deadbolt, or identify a cylinder profile. If your door has several locking points, use the dedicated multipoint identification and measurement checklist.

Choose the guide that matches your question

• What does the lock turn, pull, or lift? Identify a Door Lock by the Action It Performs
• Which measurements should I record before shopping? Measure a Door for Smart-Lock Compatibility
• Do I have a US or Canadian deadbolt replacement or retrofit case? Measure a North American Deadbolt
• What cylinder profile is installed, and how do I record its dimensions? Identify a Euro, UK Oval, Scandinavian, or Other Cylinder
• Do swing, panels, or handle sequence affect my door? Check Door Swing, Handing, Panels, and Locking Sequence
• Does the door use several lock points along its edge? Identify and Measure a Multipoint Lock
• Is the door or mechanism still unknown? Make a Compatibility Checklist When the Door Is Unknown

Keep the result specific

Measurements from one smart-lock manual do not define a universal standard. Record the country and exact model or variant you are checking, then compare every relevant field with that product’s current instructions. A physical-fit check also says nothing by itself about Matter, Wi-Fi, Bluetooth, hubs, or the features available in a particular smart-home platform.

If you cannot identify the mechanism or operation safely, leave it unknown and ask the door or lock manufacturer, a locksmith, or a qualified installer to identify it before you buy or modify hardware.