Install a Door Peephole in 5 Steps

A white door with a door knocker and peephole on it.
  • 2-3 hours
  • Beginner
  • 10-80
What You'll Need
Measuring tape
Chalk or a pencil
Drill and drill bit
Safety goggles and gloves

A peephole allows you to see who is outside of your door without opening it. In the past, a peephole was simply a small hole in the door that might allow water or bugs to get into the home. Modern peepholes mount into the door and can magnify the image of what's outside. So, there will be no more need to run to the window and peer through the blinds before going to your entryway.

Step 1- Selecting a Peephole

The most inexpensive type of opening is a metal tube with clear glass on either end. When installed, it allows you to look out. One of the biggest benefits of this option is that the person on the other side cannot see in.

Another variety is a wide angle door viewer. This type allows you to not only see directly outside of the door but also below the level and several feet to either side. This makes it easier to spot someone who may be trying to hide or to see what a visitor has in his hands. A wide angle peephole is generally better than a standard model, but it can cost a little more.

Step 2 - Finding the Right Height

The most important factor to consider when installing your new opening to the outside is how high you want it to be mounted. This can vary among households, but the average height is between 4 and 5½ feet from the ground. Anyone who would open the door should be able to comfortably look through the new peephole. So, while you want to consider the height of those currently in your household, you also want to take into consideration future homeowners in the event you will be renting or selling later.

Step 3 - Marking the Position

Use a measuring tape to measure up to the desired height and make a mark using chalk or a pencil. Measure the width of the door and make a mark at the center point. You want the marks to intersect as this will be where the peephole will be installed.

Marking the peephole position.

Step 4 - Preparing to Install

Next, you will need to drill a hole that goes completely through the door. Use the instructions to determine the required size of the drill bit that you will need. Whether you have a wooden or metal entryway, you want to ensure that there are no splinters or metal shards exposed. You can do this with a sanding pad. This will make it easier to put in the peephole and prevent injury.

Remember to wear proper safety gear during this step. You will need goggles for drilling and gloves for dealing with splinters and shards.

Step 5 - Mounting the Peep Hole

Apply a thin layer of silicone around the inside portion of where the peephole will go and slide each of the two pieces through each side of the door. Pay special attention to which direction you place the two parts to ensure that the device is installed correctly and works properly. If it is installed backward, the person on the outside will be able to see in instead of you seeing out.

Allow the adhesive to dry in place for several hours before testing it. This will ensure that you don’t accidentally knock it loose.

You are now able to easily see who is knocking on the other side of the door. The new peephole can also make your entryway more aesthetically pleasing.