: Measure the distance to the rear of the garage. It should be the door height plus 18 inches (or 50 inches if adding an opener).
: Available through major retailers like The Home Depot , where you can buy the door directly and either DIY the install or hire their contractors. 2. Measuring Your Garage (Critical Step) buy garage doors direct
Buying garage doors "direct" typically means purchasing from a factory-direct provider or a major retailer that bypasses traditional local dealer markups. This can save you money, but it requires you to handle more of the logistics, such as accurate measuring and arranging installation. : Measure the distance to the rear of the garage