---
title: How to Install a Peep Sight
description: "On this page[Introduction](#)[Before You Begin](#)[Prerequisites](#)[What You Need To Know](#)[Tools](#)[Materials](#)[Installation Steps](#)[Step 1. Mark the Drill Point](#)[Step 2. Drill the Pilot Hole](#)[Step 3. Drill the Main Hole](#)[Step 4. Install the Peephole (Peep Sight)](#)[Pro Tips](#)[Common Mistakes](#)[QC / Punch Checklist](#)[Related Guides](#) [Hardware](/learn-category/hardware/) Skill Level:…"
url: "https://letsbuildstuff.co/learn/install-peep-sight/"
updated: "2026-09-25"
category: Hardware
tags:
  - Core Guide
  - Level 2
---

# How to Install a Peep Sight

On this page[Introduction](#)[Before You Begin](#)[Prerequisites](#)[What You Need To Know](#)[Tools](#)[Materials](#)[Installation Steps](#)[Step 1. Mark the Drill Point](#)[Step 2. Drill the Pilot Hole](#)[Step 3. Drill the Main Hole](#)[Step 4. Install the Peephole (Peep Sight)](#)[Pro Tips](#)[Common Mistakes](#)[QC / Punch Checklist](#)[Related Guides](#)

[Hardware](/learn-category/hardware/) Skill Level: [Intermediate (Level 2)](/learn/difficulty-levels/#level-2) · Estimated Time: 15-20 Minutes Per Unit

## Introduction

Installing a peep sight in an apartment door is a straightforward task that enhances security and privacy for the occupants. This job typically falls towards the end of a new-construction or remodel workflow, after the door has been hung and painted following guidance like [Masonite's interior door installation guide](https://www.masonite.com/discover-and-learn/how-to-install-interior-doors/). The single most important concept to master here is precision. A well-centered, cleanly drilled hole ensures that the peep sight functions correctly and looks professional. The difference between a pro and an amateur installation is the alignment and finish of the hole, which should be free from splinters or uneven edges.

## Before You Begin

Before you install a peep sight, confirm that the following prerequisites are complete.

### Prerequisites

- Door is hung and painted
- Hardware ([locks, handles](https://letsbuildstuff.co/learn/install-a-lockset/)) installation is complete

### What You Need To Know

When you install a peep sight, understanding these core techniques will save you time and prevent callbacks.

- Ensure the hole is drilled at the height called out on the plans. There is no standard peep sight height
- Use a drill bit that matches the diameter of the peep sight's [barrel](/glossary/hardware/#butt-hinge-leaf-knuckle-barrel-pin) for a snug fit
- Drill from both sides to prevent splintering

## Tools

- Drill - for creating the hole in the door
- Drill bit set - to match the peep sight barrel diameter
- Measuring tape - to ensure correct height placement
- Level - to verify vertical alignment

## Materials

- Peep sight - standard size for residential doors, available at hardware suppliers
- Masking tape - to mark drill points and prevent splintering

## Installation Steps

### Step 1. Mark the Drill Point

Check the plans for the peep sight height and mark the drill point on the door's exterior side. Use a level to ensure the mark is vertically aligned.

- Apply masking tape over the mark to minimize splintering

### Step 2. Drill the Pilot Hole

Using a small drill bit, create a [pilot hole](/glossary/materials/#trim-head-screw-pilot-hole) through the door at the marked point. This helps guide the larger bit and ensures accuracy.

### Step 3. Drill the Main Hole

Switch to a drill bit that matches the peep sight's barrel diameter. Drill halfway through the door from the exterior side, then finish from the interior to prevent splintering.

### Step 4. Install the Peephole (Peep Sight)

Insert the peep sight barrel through the hole and screw the interior and exterior pieces together until snug.

## Pro Tips

**Pro Tip:** Drilling from both sides of the door prevents splintering, ensuring a clean finish on both surfaces.

**Pro Tip:** Use a piece of scrap wood behind the drill exit point to further reduce splintering.

## Common Mistakes

- **Mistake:** Misaligned hole - results from not using a level or incorrect height measurement
- **Mistake:** Splintered edges - occurs if drilling is done in one pass from only one side

## QC / Punch Checklist

- Peep sight is centered and aligned at the correct height
- Edges around the peep sight are smooth with no splintering
- Peep sight is securely fastened and does not wobble

## Related Guides

- [How to Install a Door Bump](https://letsbuildstuff.co/learn/install-door-bump/)
- [How to Install Privacy Pocket Door Hardware](https://letsbuildstuff.co/learn/install-privacy-pocket-door-hardware/)

Written by **David Hospodka**, Sun’s Up Construction

David Hospodka learned finish carpentry from his father, alongside his brother Joel, and worked his way through college trimming houses. He then spent about ten years as a railroad bridge engineer, handling design, construction, maintenance and project management. He came back to finish carpentry full time in 2017.

[About Let’s Build Stuff](https://letsbuildstuff.co/about/)