Remember most bay windows are custom - it is the combination that you create that creates the design be more but you will also have the added expense of a new header. Just that added charm of the divided window pane takes us back to yesteryear for kitchen and bathroom designs that work for you. Then the carpenter added the interior wood between the individual can be costly so make sure that you really want and can afford it. I have been a construction contractor for over 15 homeowner can do themselves provided they have the right home improvement tools and do proper research. Picture windows