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What Are the Standard Garage Door Sizes

How to Measure a Garage Door
A diagram indicates how to measure a garage door.

Measuring a residential garage door is more than determining the dimensions of the door, but making sure the garage can accommodate a garage door opener and the door in both open and closed positions. 

  • Begin by using a tape measure to determine the width and height of the door opening in inches. The size of the door will be approximately the same as this, sometimes called the "rough opening."
  • Next, measure the “sideroom,” or space available on the left and right sides of the opening. Most vertical track systems with torsion springs or other hardware require 3 3/4-in. on each side, although some systems can require up to 5 1/2-in. per side. 
  • Measure the head room, the distance between the top of the door opening (or door jamb header) and the ceiling of the garage. Standard systems require 10 inches of headroom, while some require 12 inches, while garage door openers often require an additional three inches of clearance. 
  • Measure the backroom, the distance from the garage door opening to the back wall of the garage. A garage will need backroom that equals the door height plus 18 inches, and possibly more based on the installation of an automatic garage door opener. 


Tip: Use a step ladder to more easily measure the ceiling height.   


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What Are the Standard Garage Door Sizes?
A house with a standard-size garage door.

Single garage doors can be small enough for golf carts or large enough for tractors, depending on your home or community, For most homes, the standard single-car garage door is 8 to 9 feet wide and 7 to 8 feet high. New construction frequently offers 9 x 7 garage doors but increasingly offers door widths of 10 feet. These garage door dimensions tend to be the same for an attached as a detached garage.

What Are the Standard Double Garage Door Sizes?
A home with a double-size garage door.

Many homeowners have two cars and need garage space to shelter them both. The standard size for double garage doors is 16 feet wide and 7 to 8 feet high. 

  • Many 16 x 7 garage doors will be designed with a pair of single 8-foot garage door bays, separated by a central post or column. Many home builders do not consider this a structural necessity, but a style and price choice for the homeowner. 
  • One double door can be more visually prominent than two single doors. 
  • Two single doors and one double door have comparable prices, but two single doors each need a garage door opener, while a double door requires only one opener, offering some cost savings. 
Custom Garage Doors
A home with a custom garage door.

Custom garage doors can offer door height of 10 feet or more to accommodate large vehicles such as certain kinds of trucks, recreational vehicles or vehicles with tall roof racks. They can also be made to fit garages of unusual dimensions that may not accommodate standard garage door sizes.

Standard Garage Door Thickness
A person adds insulation to the back of a garage door, increasing its thickness.

The thickness of residential garage doors can dictate the cost of a door as well as how well it is insulated. Not all garages need insulation, so compare price against how you plan to use your garage. 

  • Steel garage doors can have panels of as little as 1/8 inches and be the most cost-effective, but offer little insulation. 
  • Insulated doors have 1/4 to 1/2-in. foam insulation on the inside of the steel panels. 
  • Well-insulated doors have two panels with 1 to 1 1/2-in. thick layers of foam sandwiched between them. 


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A new garage door can enhance your home's appearance, so learning garage door standard sizes can help you make an informed decision. 


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