I bought this old house with a basement thinking I'd use the entire basement for my sewing room as it also included a full bathroom. Of course the furnace and storage rooms took away some of the space and then so did the laundry but not really that much. Anyway I then had a small kitchenette installed using the old sink from the kitchen so I could starch my fabrics and hang them up on a rod I installed between the rafters. Little by little I enlarged some items such as the cutting table, quilt machine and frame, added more shelving for fabrics and supplies and finally a design wall. Now its too small for all I have here but its all mine and I tend to live down here from time to time.
I have a 26" machine with 12' frame, down to 1 embroidery machine and 1 serger, 1 regular machine, most all the walls are full with rulers, threads, etc. shelving for fabrics along 2 outer walls and 1 inner wall. I tend to use the quilt frame for my drop off when not in use. Have shelving under the cutting table that went from 3 x 6 to 4 x 8 using 2 bottom halves of a couple bookcases so storage for books and patterns, shelving underneath to keep my scraps and fat quarters.