I think I'll call a realtor - the one that sold us this house and just ask her. I really like the idea of a detached garage. Call me funny but I find them more charming than an attached one however I do see appreciate being able to just pull in so you don't get wet when it's raining...
I think we would be able to keep one window in that room - a sunroom wouldn't work at all. They want to be able to play video games in there and have it a bit more soundproof. Our development has an all brick clause in our covenants too :( No sun rooms allowed here unless they are somehow bricky. Everything has to be approved here.
I'm going to take a tape measure outside and see what I can come up with...