This is actually a very simple conversion. It's all in the paint and garage doors. I have been thinking of doing something more quaint, but this is simple and stylish Converted Garage Living Room Sitting Area - on HGTV
part windows, part garage door, all awesome - could make a cool back wall for our future sun room addition off the master bedroom . open up the back wall to create true indoor/outdoor space facing the garden :)
Architectural Designs Exclusive Bungalow House Plan gives you a master-on-main and a bedroom (or two if you use the sitting room as a bedroom) upstairs. Plus a bonus room over the garage. Over square feet of living space. More photos online.