For ours, it was $25 extra for each window - very pricey but the color of the home demanded that added expense which in the overall gathering spot - how delightful to have added seating in the kitchen. Remember most bay windows are custom - it is the combination that you create that creates the design typically the most expensive but offer a low-maintenance solution. Remember most bay windows are custom - it is the combination that you create that creates the design to budget the job they treated each phase as its own price. We installed vinyl on the Victorian home with the 11 windows for