Which of the following is NOT a type of architectural fee structure?

The chosen answer indicates that "Hourly Rate" is not a type of architectural fee structure. In reality, though, the Hourly Rate is indeed a recognized method of billing in architectural practice.

The correct understanding lies in that all options listed are common types of architectural fee structures, including Fixed Fee (lump sum), Time Based, and Percentage Base.

A Fixed Fee involves charging a set price for a particular project regardless of the time or resources expended. This method is often used when the scope of work is clearly defined.

Time Based fees, as the name suggests, are based on the amount of time spent on the project, where clients are billed for the hours worked, which allows for flexibility depending on the extent of work required.

Percentage Base fees are calculated as a percentage of the total construction cost, making it common in larger projects where the overall cost can vary.

Therefore, the assertion that "Hourly Rate" is not a fee structure is inaccurate, as it is a legitimate billing method used by many architects. The question likely aims to test knowledge of architectural economics and practice.