The Door Viewer Is a Drill Job: Pick the Height, Drill the Door, and Test It From Inside

Dad may not want a camera on the front of the house, and he may not want a chain on the door, but he will often accept a door viewer because it changes nothing about how he lives. He can see who is on the step and decide whether to open up. The job is a drill job that goes wrong in predictable places, so do it in order.

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Check the door before you drill

Knock on the door at the spot you plan to use. A solid slab sounds dense. A hollow core door sounds like a drum and may need a different mounting method or a different door. Open the door and look at the back for anything that would sit behind the hole. Confirm the kit's barrel length covers the door thickness you actually measured, not the number on the box. If the door is steel or fire rated, read the maker's instructions before drilling, because the maker may specify where and how to cut.

Mark the height and drill

Pick the height by the person who answers the door most often. Have Dad stand where he normally stands, look at the door, and mark the center at his eye level. Tape the template to the outside face so the bit does not skate. Drill the pilot hole from the outside with the bit square to the surface and steady pressure. Step up to the full-size bit only after the pilot goes straight through. If the wood starts to splinter on the exit side, back the bit out before it tears.

Set the viewer and test from inside

Insert the barrel from the outside, then thread the inside cap until it seats snug without crushing the door. Clean the lens and check the view. Have someone stand on the step and move slowly from the edge to the center while you watch from inside. Look for a blind spot near the hinge side. If you cannot see a person standing right at the door, the height or angle is wrong, and it is better to fix it now than after the first delivery.

Log the install

Write one line in the house notes: who installed the viewer, the height used, and where the template is kept. The next person who needs to adjust it will not have to guess. Next move: have someone stand on the step while you watch from the inside, then mark on the floor the exact spot where you stand to see the step clearly.