We didn't build out, but we finished about 1,000 sq ft in the basement about a year ago. We went from 1800 ft to 2800 of living space. That's where my sewing room is now as well as a family room and library. We're in our 60's, my husband is still working, and we felt we could afford it. We're very happy with how it turned out. We hired a contractor and the project was about $65,000. When we got our new home value from the tax assessor, it didn't add a lot to our home value but we think it will make our house more marketable when we move. I think if you can afford it and you know you'll enjoy the extra space, go for it. I also think it won't take long to get really tired of that big frame taking up so much room in your living room! This craziness is what happens to us quilters, although you seem to have hopped on the quilt train pretty quickly! It's great to have an understanding husband.