Standard Garage Door Sizes

The size of the garage door is an important consideration, whether building a new home or installing a new garage. While there are a few standard garage door sizes, the ever-growing world of custom home building and designing a garage to fit SUVs, boats, trucks, motorcycles and more for a range of possibilities.

The width and height of a standard garage door can vary depending on where you live, but they are usually set sizes, such as a single-car garage door at 8 feet wide by 7 feet tall or 9 feet wide by 7 feet tall.

Double garage doors measure 16 feet by 7 feet, yet you can find the standard garage door size varies on bespoke buildings where custom garage door sizes are needed.

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In our guide, you can learn all there is regarding your garage door height and garage door width, as there is more to it than the hole in your wall. (Learn About Shed Organization)

By the end, you’ll see how to measure and what’s needed for energy efficiency and whether two single garage doors are better than one single garage door that spans the width of your garage.

What Is The Standard 2 Car Garage Door Size?

Common garage door sizes are available in various sizes and styles, but most home builders tend to use standard garage door sizes. Here, you can find the average garage door size for a two-car garage and other door widths that may be appropriate.

Standard Door Size For a Two Car Garage?

  • Depending on the size of the garage, two-car garage doors might be 12, 14, 16, or 18 feet wide. 16-foot doors are best suited to garages that are 18 feet wide to 24 feet wide.

Standard Height of Residential Garage Doors?

  • The standard door height is 7 feet; however, it can vary from 6’6” to 8 feet. For doors taller than 8 feet, manufacturers normally charge an extra fee.

Standard Single Car Garage Door Size

  • The most common width for a single-car garage door is 9 feet. However, older can have 8-foot-wide garage doors, and you can find garages with 10-foot-wide doors.

Three-Car Garage Standard Door Sizes

  • Depending on the structure of a home, three-car garages can be installed differently. Contemporary homes can have one single, 8 or 9-foot-wide door and one double 16-foot-wide door. (Read Standard Tool Sizes)
  • Other homes have three 8 or 9-foot-wide doors. If you considered a single door spanning the entire width of your three-car garage, this would be too heavy to operate.


How to Measure for Residential Garage Doors

A residential garage door measurement isn’t just the door’s measurements but ensuring the garage can fit a garage door opener in open and closed positions.

  1. Start measuring the width and height of the door opening in inches with a tape measure. The door will be around the same size as this, referred to as the “rough opening.”
  2. Next, measure the “side room” on both sides of the opening. Most vertical track systems with torsion springs or other hardware require 3 3/4-in. per side, however other systems may require as much as 5 1/2-in. per side. 
  3. The distance between the top of the door opening and your garage ceiling is the headroom. Garage door openers need clearance of an additional three inches. Standard systems need 10 inches of head room, while some require 12 inches.
  4. You will need to go to the closest inch in height, as it is one dimension, which could vary on your garage doors.
  5. The distance between the garage door opening and the garage’s back wall or the backroom needs the equivalent to the door height plus 18 inches, and possibly more should an automatic garage door opener be used.

Various Door Sizes and Use for garage Doors

Depending on your home, single garage doors can be suitable for a golf cart or large enough to house a large tractor. (Read Light Socket Sizes)

You’ll often find a standard single-car garage door that is 8 to 9 feet wide and 7 to 8 feet high for most homes. Although 9 x 7 garage doors are becoming more common for new construction, door widths of 10 feet are becoming the standard.

The garage door dimensions of an attached garage door are usually the same as those of detached garage space.

Here are a few things to consider when considering a new garage door to cover your interior space.

  • In 16 x 7 garage doors, a central pillar or column often separates a pair of single 8-foot garage door bays. Many home builders look at this as a design choice and the price impact on a homeowner rather than a structural requirement.
  • Two single doors may be more visually appealing than one double door.
  • Two single doors cost the same as one double door; however, two single doors require two garage door openers, whereas a double door requires one opener, saving money.
  • Custom garage doors with a door height of 10 feet or more are required for large vehicles such as trucks, recreational vehicles, and vehicles with tall roof racks. They can also be tailored to fit garages with unusual dimensions that don’t conform to standard garage door dimensions.
  • A person increases the thickness of a garage door by adding insulation to the back. Steel garage doors are the most cost-effective and can have panels as thin as 1/8 inch, but they provide little insulation.
  • On the inside of the steel panels, insulated doors contain 1/4 to 1/2-inch foam insulation. Two panels with 1 to 1 1/2-inch-thick layers of foam sandwiched between them make up well-insulated doors.

What Sizes Do Overhead Garage Doors Come In?

Standard sizes for door widths for overhead garage doors are 8′, 9′ 10′, 12′, 15′, 16′, 18′ and 20′.

A single door:

The most common door width for a 12 x 22 foot detached or attached garage is between 8 and 9 feet. The height is usually 7 to 8 feet.

For those who wish to park a recreational vehicle, the height can be increased to 12 feet (RV). The ideal shed garage door size is 8 x 14 feet. So, the garage door is 6’6″ x 6’6″.

A double door:

The most common garage door width is 16 feet for an 18 x 24 foot attached or detached garage. It’s about 7 or 8 feet in height. The RV door may open to 10 feet.


If your 16-foot garage door cannot open, two cars can be trapped inside. It would be nearly impossible to happen with two single garage doors.

A double garage door allows in more cold air than a single door in cold climates, lowering the garage space temperature faster.


2 single doors cost about the same as 1 double garage door, yet you need two electric openers on either single door.

Standard Garage Door Sizes (2)

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