What is the proper size for a cupola?
This is a design question that defies a simple and straightforward answer. The answer depends on a number of variables. Aesthetic appeal in terms of the cupola’s proportional relationship with its surroundings is of course extremely important. One should also consider: what supports the cupola, how much it weighs, its intended purpose (i.e. as lookout, lantern, ventilation, or simply ornament), and any height or code restrictions that govern its construction. How it will be built and located in its final position can also affect the answer to this question. Several of the sites listed above offer general advice in this regard, especially the ones who sell prefabricated cupolas. But from what I have seen, their advice is based almost solely on basic rules of proportion and little else. For a more complete answer, especially on a big cupola, you may need to enlist the help of a professional in the building industry, such as an architect, structural engineer, or contractor.
