Keypad Deadbolt (Smart Locks)

Strip out the radios and you are left with this. A number pad on the outside, a motor or a simple clutch on the inside, and a small memory holding perhaps 10 to 250 codes. Nothing pairs, nothing signs in, and nothing needs Wi-Fi, a hub or an account. Battery life climbs accordingly, often 12 months or more on four AA cells, because the only current drawn is the bolt turning and the pad waking under a finger.

A Smart Deadbolt looks nearly identical from the street and adds remote locking, logs and phone keys, at the cost of a battery budget and a company that has to keep supporting it. A Retrofit Deadbolt Adapter gives you the phone control without a code pad outside. Choose this style when the value you want is the missing key, not the connected home.

Anyone who has cut a fifth spare key should look hard at it. It fits a side or garage door, a holiday house with no reliable internet, and any household that would rather not put a door on a cloud account. Older keypads with a mechanical clutch will also let you in when the electronics fail entirely. Its limit is clear. You cannot check the door from work, and you cannot see who came in unless the model stores a log you read at the keypad.

Prefer a pad that scrambles the digit layout or asks for random extra presses, since both defeat the wear pattern that gives a fixed code away. Codes of 6 digits raise the guess space to a million, and a lockout after 3 to 5 wrong tries makes brute force pointless. Confirm the ANSI/BHMA grade and a 1 inch bolt, and check whether the keypad is rated for the cold your door actually sees.

Wipe the keypad monthly with a dry cloth so no four buttons stand out. Rotate codes at least once a year and after any contractor visit. If the model keeps a master code on a card in the box, store that card away from the door, because it is a spare key in paper form.