When it comes to deciding on the size of your cupola, there are a few things you'll need to take into account. The most important factor is the overall width of your barn - the larger the barn, the bigger the cupola can be. You'll also want to consider how much ventilation you need, as well as what kind of weather conditions you typically experience.
Generally speaking, a good rule of thumb is that your cupola should be one-third the width of your barn. So, if your barn is 30 feet wide, your cupola should be 10 feet wide. Of course, you can always go smaller or larger depending on your specific needs and preferences.
Another thing to keep in mind is that the height of your cupola will affect its overall look and appearance. If you want a more substantial and stately look, go for a taller cupola. On the other hand, if you're aiming for a more understated look, a shorter cupola may be better suited for you.
Ultimately, it's important to choose a size that looks proportional to your barn and provides adequate ventilation without being too big or small for the space. By taking all these factors into consideration, you can be sure to find the perfect sized cupola for your home!