Which of the following structures would NOT typically be classified as an accessory structure?

The classification of accessory structures typically refers to buildings or structures that are secondary to the primary residence on a property and serve a purpose that is incidental to the main use. In this context, a fully equipped guest house stands out as it can function as a separate living space, offering amenities like a kitchen and bathroom, effectively serving as a self-contained residence. This autonomy in purpose and function distinguishes it from typical accessory structures, which generally provide storage or support functions.

In contrast, garden sheds, detached garages, and tool storage units are more aligned with the characteristics of accessory structures. These types of buildings primarily serve practical uses such as storage for tools, vehicles, or garden supplies and do not provide independent living accommodations. Thus, while they complement the main dwelling, they do not possess the same level of functionality as a guest house, which can operate independently. This key distinction is why the fully equipped guest house is not typically classified as an accessory structure.