A few things.
a standard two car garage door is 16 x 7. Going wider is doable, just remember that all the materials for the engineering on these garage doors are based around 16', going wider means more weight, more stress on the hardware and materials. Tread lightly, use trusted and old companies for the manufacture.
Using an engineered beam or steel is the only way too go across the head. It's super easy, and reasonable, for an structural engineer to do, which then makes the permitting and installing (spec) a piece of cake.
Hope this helps, mike
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Mike
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