Which of the following trades requires a general building contractor to have additional specialty licensing?

A general building contractor in Nevada is required to have a specialty license for specific trades that fall outside the scope of general building. Both electrical work and plumbing are regulated specialties that necessitate additional licensing due to their technical nature and the safety implications involved.

Electrical work requires knowledge of complex systems, wiring standards, and safety regulations, while plumbing involves understanding of water systems, waste management, and building codes. Specialty licenses ensure that contractors possess the necessary expertise and qualifications to perform these tasks safely and legally.

Structural work, while also crucial to building integrity, typically falls under the purview of the general building contractor's license. However, if aspects of structural work involve specialized installations or materials, additional licensing may be required depending on the specifics of the project.

Thus, since both electrical and plumbing work demand further qualifications, the correct answer is indeed that all of the mentioned trades require a general building contractor to have additional specialty licensing.