I'm estimating 18x24 or so. It is the bonus room above our 2 car garage. My dh re-did it for me this past July, after our youngest dd graduated from high school. It is the perfect size; my dream sewing room! I never want to move again! I have an area with a couch and chair for visitors and just simply relaxing. I have a spot for 7 machines and a quilting table. I also have a cutting table that is the perfect height for me (it used to be our kitchen bar). And there is a walk in closet for all of my sewing/xstitch/soapmaking supplies!
Janelle