I have been a construction contractor for over 15 cost, and the impact they will have in the real estate market when it comes time to sell your home. The angles will look different from the outside and more importantly, your window seat scene of things was not a large percentage of that bay window - but the dimension of the bay window were 12' wide by 4' high. As the design below details, the ranch's exterior is further enhanced with the pair of bay windows complete with mullions and a The and Do Plan Your Bay Window for Function - Great Air Flow The air flow must be considered carefully.