Home Garage Door How to Measure an 8×7 Garage Door Rough Opening

How to Measure an 8×7 Garage Door Rough Opening

A garage door rough opening is the initial space left in the wall during construction to accommodate the installation of […]

A garage door rough opening is the initial space left in the wall during construction to accommodate the installation of a garage door.

It is crucial to get the dimensions of this opening right to ensure a seamless and functional fit for the door. In this guide, we will explore the importance of measuring and framing an 8×7 garage door rough opening accurately.

Whether you plan to take the DIY route or hire a professional contractor, these guidelines will help you achieve a successful installation and long-term maintenance of your garage door.

What is a Garage Door Rough Opening?

Before diving into the details of measuring and framing, let’s understand what a garage door rough opening is.

When constructing or renovating a garage, a space larger than the actual garage door size is left in the wall.

This space, known as the rough opening, provides room for the necessary framing around the door and ensures proper operation of the garage door.

Why is it Important to Measure and Frame an 8×7 Garage Door Rough Opening Correctly?


Accurate measurements and framing are vital for several reasons. Firstly, it guarantees a snug and secure fit for the garage door, preventing any unwanted gaps that could compromise the security and insulation of the garage.

Secondly, precise framing allows for smooth door operation, reducing wear and tear on the door components.

Finally, a well-framed rough opening ensures the longevity of your garage door system, saving you from potentially costly repairs or replacements in the future.

Measuring the Rough Opening

Before you begin the framing process, measuring the rough opening correctly is of utmost importance. Here are the steps to ensure accurate measurements:

Step 1: Gather the Necessary Tools and Materials

To measure the rough opening, you will need a tape measure and a level for precise measurements and straight framing.

Step 2: Measure the Width and Height of the Existing Garage Door Opening

Begin by measuring the width and height of your existing garage door opening. For an 8×7 garage door, this should be 8 feet wide and 7 feet tall.

Step 3: Calculate the Rough Opening Dimensions

To determine the rough opening dimensions, add 3 inches to the width (8′ + 3″ = 8’3″) and 1.5 inches to the height (7′ + 1.5″ = 7’1.5″).

Framing the Rough Opening

Now that you have the accurate measurements, it’s time to frame the rough opening. Proper framing is essential for the stability and functionality of the garage door. Here’s how to go about it:

Step 1: Gather the Necessary Tools and Materials

For framing, you will need 2×4 lumber, a level, nails, a hammer, a saw, shims, and a header for structural support.

Step 2: Install the Header

The header is a critical component that distributes the door’s weight evenly across the opening. It should be 9 inches wider than the door (8 feet + 9 inches = 9’3″). Install the header at least 6 inches above the top of the door. Use a level to ensure it is perfectly horizontal and secure it in place.

Step 3: Install the Joists

The joists provide additional support for the header and the overall framing. Install them at 16-inch intervals, starting from the ends of the header.

Step 4: Level the Framing

Use shims to level the framing and ensure the rough opening is perfectly square and plumb. This step is crucial to prevent any issues during the garage door installation.


Accurate measurement and framing of an 8×7 garage door rough opening are essential for a smooth installation and long-term functionality of your garage door.

Whether you choose to tackle this project as a DIY enthusiast or seek the expertise of a professional contractor, following these guidelines will help you achieve the best results.

Remember, when it comes to your garage door, precision and attention to detail will pay off in the long run, ensuring the security, convenience, and value of your home.


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Furqan Abril

Furqan Abril

As an author and expert in garage door systems, I am excited to share my knowledge and experiences with you. Whether you're a homeowner, a garage door enthusiast, or a professional in the industry, this web will serve as your comprehensive guide to understanding, maintaining, and enhancing your garage door.

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