A keypad lock removes the hunt for keys at dusk, but it adds a code that every adult in the home must know and must be able to use in the dark. The install itself is a matter of measuring, swapping, and testing in the right order. Skip a step, and the door may stick, the code may go unknown, or the inside of the door may stop opening cleanly. Follow the steps below and the afternoon stays calm.

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Before You Open the Box

Confirm that the door is an ordinary residential door and not a fire door, a door in a multi-unit building, or a door on a required escape route. If it is any of those, check with your local building or fire office before you change the lock. Then measure three things. Measure the door thickness. Measure the backset, which is the distance from the edge of the door to the center of the existing lock hole. Measure the bore, which is the round hole the lock body sits in. Match the kit to those numbers, and read the manual's thickness range before buying.

Remove the Old Lock Carefully

Photograph the existing lock and the strike plate on the frame before you touch anything. Remove the old lock and keep its screws and parts in a labeled bag. Keep the old lock until the new one has passed every test, because it is your fallback if the new unit has a fault. Check that the door latches and swings freely with the old hardware removed, and fix any rubbing before the new lock goes in.

Set the Latch and the Keypad

Install the latch through the door edge following the manual's template. Set the outside keypad and the inside turn piece according to the instructions, and make sure both sit flat against the door. If the model is wired, run the cable through the door before you fasten the parts, and keep the cable clear of the latch. Put the battery in the outside compartment where the manual says, and make sure the cover seats properly against the weather. Only seal a gap if the manual asks for it, because a sealant in the wrong place can trap moisture.

Program the Codes

Set the administrator code first, then add a separate user code for each adult who lives in the home, if the model allows it. A temporary code for a visitor or a home aide can be set to expire, and that is the cleanest way to handle visitors. The household decides who gets a code, and the code list belongs with the household. Write the codes on a card, seal it in an envelope, and store it somewhere the adults know. Do not put the code on the door, the frame, or a sticky note anywhere near the entry.

Test From Both Sides

Lock the door from the outside with a code, then open it from inside with the turn piece, which should open with one motion and no code. Test with the door closed and then with a light touch on the handle. Enter a wrong code on purpose and read the manual for the lockout behavior, so the first wrong attempt on a cold evening does not come as a surprise. Test the lock again after dark with the lights off, because that is the condition the lock will face.

Plan for a Power or Battery Failure

Read the manual to learn what the lock does during a battery failure, and whether a standard key still opens it from outside. Keep a standard key in a place the adults know, and change the batteries on a schedule rather than waiting for the warning. Confirm that the inside of the door opens without a code in every condition, since that is the way out for anyone inside.

For the order to handle the whole house at dusk, read Start Here: Dusk to Morning, in Order. For the questions to ask before buying any home safety product, see the Sources page.

A Keypad Lock Takes One Afternoon When the Steps Run in Order. Follow the Install From Measure to First Test.