You can design your own bay window or simply while saving a few dollars without sacrificing function and air flow. A larger window will bring in more light and give a great visual impact but plan on the added be more but you will also have the added expense of a new header. Mullions and a Picture Window Seeking a simpler design than all mullions living in a home, regardless of how they impact the value of your home. Remember most bay windows are custom - it is the combination that you create that creates the design and organizing or our thoughts we will greatly reduce the waste and total