What is the term for the warehouse where barrel aging occurs?

The term for the warehouse where barrel aging occurs is commonly known as a Rick House. This terminology is particularly associated with the whiskey industry, especially bourbon production.

Rick Houses are specifically designed with a structure that allows for the storage of barrels in a manner that optimizes the aging process. The barrels are typically stacked on wooden ricks, which can be several stories high, facilitating airflow and temperature variations that are essential for the interaction between the spirit, wood, and the environment. These conditions contribute to the development of flavors and characteristics in the bourbon as it matures over time.

The other options do not accurately reflect the specific terminology most widely used in the industry. A Barrel House might refer to a similar concept, but it is not as widely recognized as a Rick House in the context of bourbon aging. A Cask Warehouse or Storage Barn are not commonly used terms in the industry for describing the facility designated for aging barrels of whiskey. Hence, Rick House is the most accepted and recognized term among bourbon enthusiasts and professionals for this particular type of structure.