And no, I wouldn't rent it out. Not interested in having other people in my face. The upper level in that first one would be ideal for my office and electronics/computer area and although with sewer/water connection still be far cheaper than paying for office space somewhere.
Here's a much bigger one.
This traditional-style carriage house plan features a large 2-bedroom apartment above a 3-car garage. The ground level includes 3 single car bays and a large foyer with a bathroom. Upstairs, you
www.architecturaldesigns.com
Again, wouldn't rent it out. Instead to avoid capital gains taxes would likely move into it and then refinish our existing house which has an upper and lower driveway into a two suite house. Renovation costs and taxes plus fixed costs for utilities would be easily covered by the lower suite rent and the upper would cover the carriage house shop. The second bedroom a sewing room for my wife with the Murphy bed moved over from the old house for the occasional guest. The study becomes a walk in closet and the washroom an ensuite since there's a second one on the main floor entry foyer.
And a nice big shop for me and my toys.... I mean tools...
But all just dreaming for now. I think a small space for an elevator that can handle a wheel chair in case one of us in the future might need that and the stairs to the suite are too much.