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Standard garage door sizes for single doors range from 8 feet wide by 7 feet tall to 9 feet wide by 7 feet tall. An oversized single garage door would be 10 feet wide by 7 feet wide. The standard size for double garage doors is 16 feet wide by 7 feet high. However, some custom double garage doors can be as wide as 20 feet.

A garage counts toward the official square footage of a house if it is considered livable space. For a garage to qualify, it typically needs to be attached to the home and have permanent finishings like proper insulation, finished walls, and ceilings. It must also be livable year-round, which requires adequate heating, cooling, and ventilation. The exact legal requirements for what constitutes living space can vary by location.

If you open your garage manually, you don’t need sensors. If you have an automatic garage door opener, sensors are required by law. The federal law UL 325 mandates that all residential garage door openers in the U.S. must include sensors. Designed to prevent accidents and reduce the risk of entrapment, the sensors should be able to reverse the motion of the garage door within two seconds of detecting an obstruction. The sensors are there to keep you, your family, and your belongings safe from a door that might otherwise come down too hard or too fast.

An average two-car garage size is about 580 square feet. A common dimension for a two-car garage is 24-feet deep by 24-feet wide, as measured by the interior width. However, the manufacturing of larger vehicle sizes means many homeowners want to build bigger garages. It’s not uncommon for a two-car garage to be 30-feet by 30-feet.