Is it an accessory dwelling unit or a primary residence? It depends on the needs of your client, but this new garage plan with an apartment above can fit many different situations.
On the exterior, modern farmhouse style (see more farmhouse designs at Houseplans.com) is easy to match with an existing farmhouse design or for a later build.
The ground level holds the three-car garage. This spacious area can be used for parking cars, storing lawn equipment, or simply for extra storage. Note the two different ways to access the entry for the living space upstairs.
Here's the really versatile part. The two-bedroom apartment on the upper level presents a contemporary open layout with the kitchen flowing into the dining area. On the left side, each bedroom includes a generous closet. The hall bathroom feels modern with a large shower.