: Ensure there is at least 3-3/4 inches on each side for the vertical tracks.

: 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)

: Specializes in commercial and residential metal roll-up doors sold factory-direct to the public.

While many manufacturers use a dealer network, several offer direct purchasing or clear "buy direct" options through specialized channels:

: 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).

: Measure the rough opening (the inside of the door frame).