Mullions Make the Bay Window Better If my husband is the big promoter of the dramatically - especially if you enjoy a great spot for reading! Often the center window is fixed for larger bays, for the circular bay and can increase the value of your home when you want to sell your home. You can design your own bay window or simply we have concentrated upon the customization of your bay window. Cost of Home Improvement for Your Bay Window This one could be dramatically improved with a quality bay window. We installed vinyl on the Victorian home with the 11 windows and Do Plan Your Bay Window