What is an example of a non-recurring variable expense?

A non-recurring variable expense is an expenditure that occurs irregularly and is not part of the routine operational costs. The addition of a new structure to a building is a significant investment and does not happen regularly, distinguishing it from routine expenses. This type of expense can vary in amount based on the specific project or need at the time but does not form part of fixed operating costs or ongoing obligations.

In contrast, regular maintenance fees, supply purchases for the office, and monthly utility bills are recurrent expenses that typically occur on a scheduled basis. Maintenance fees are often planned within a budget and recur periodically, supply purchases happen routinely as needs arise, and utility bills are paid monthly, reflecting ongoing operational usage. Therefore, they do not fit the definition of a non-recurring variable expense, making the addition to the building the correct example.