When an adult son wants a keypad deadbolt on his father's side door, the first move is usually to compare keypads. That is the wrong place to start. The keypad is the part you can see, but the total is set by what the door already is and what the lock has to connect to. Read these four things before you ask anyone for a number.
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The door and the frame
Check whether the side door is solid wood, hollow core, or steel. A thin or hollow door may need reinforcement before it can take a deadbolt body without splitting. Ask the installer whether the existing bore holes can be used or whether new holes must be drilled. If the current holes line up with the new lock, the job is shorter. If they do not, the installer has to drill, patch, and retest, which adds labor and sometimes a second visit.
The power source
Most keypad deadbolts run on batteries. Ask which battery type the lock uses, where the compartment sits, and how the lock warns you when power is low. Ask whether it has an external contact for emergency power and whether the warning is audible from inside the house. If there is no outlet near the door, a hardwired option is not the default. It is a different job that may need an electrician, and that changes the bill.
The codes and the hub
A keypad holds codes, and someone has to set them up. Ask whether the installer sets the first code, how many codes the lock holds, and whether codes can be changed without taking the lock apart. Some models need a phone app or a separate hub, which adds a purchase and a recurring step. Decide who gets a code, who holds the master code, and who is told when a code changes. Settle those household choices before the installer arrives.
The labor and the callback
Ask for each cost on its own line: the lock, the labor, any drilling or hardware, and any trip or after-hours charge. Ask whether a callback is included if the lock sticks or a code fails in the first weeks. A single bundled number is hard to compare against another quote, because you cannot see which assumptions it rests on.
What to check before you compare
Write down five facts: the door material, whether the bore holes already exist, the battery type, whether a hub is needed, and whether a callback is included. Send those five facts to every installer and ask each one for a quote built on them. Quotes built on different assumptions cannot be compared fairly.
Next move: Walk out to the side door tonight, open it, and write down the door material, the hole pattern if you can see it, and the nearest outlet. Send those three facts to two installers and ask for a written quote built on them.