2 car garage with second story apartment plan no. by Behm Design x garage apartment has full second story above and external stairway. The plans include the upper 2 BR plan as well as an open floor plan as alternate.
Architectural Designs Carriage House Plan gives you parking for 3 cars on the main floor and a fully-functioning apartment with almost sq. on the second floor. Only I'd make at least 1 of the garage bays living space too.