You most definitely need a permit and engineered drawings
A you're changing structure
B dont use any contractor who says you dont
C even the concrete needs to be of known strength or have a stronger deeper footing to handle the extra loads at the end
D you need either wood or steel beam AND a lintel. A lintel is literally a piece of angle attached to structure to then hold up your brickwork above the new door . Go hit he "ledge" above those two doors now ... its steel
Goodluck with this could be super cool when done ... correctly lol
Years ago I built a 24X28 freestanding garage. My wife wanted two separate doors, I wanted a single 16' wide. It is a pain to park two cars side by side using the 16' door. Why are they always right, lol...
Just an opinion, your situation may be very different...
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.
I would open the wall to check to see if that section is load bearing. It may not be, as most garages are built with the beam extending all the way across both openings. That way if a car jumps into gear or some kind of accident happens where someone drives into that small section, the entire house wouldn't come down.