Which of the following actions does NOT require a contractor's license?

Operating a landscaping service does not require a contractor's license because many landscaping activities fall under the definition of maintenance or gardening rather than construction. General landscaping tasks such as planting, maintaining gardens, and caring for lawns are typically considered maintenance activities, which do not necessitate a contractor's license.

In contrast, other options like building a custom home and installing a fence involve construction activities that require licenses due to their complexity and the need to adhere to specific building codes and regulations. Maintenance work on existing structures can sometimes fall into a gray area, but if it involves significant alterations or repairs, it may also require a license. Thus, landscaping services remain distinct in that they largely engage in non-structural, maintenance-oriented tasks, allowing them to operate without needing a contractor's license.