A registered company shall not subcontract structural fumigation work without what?

The correct choice focuses on the requirement for a registered company to obtain written consent from the consumer before subcontracting structural fumigation work. This is essential to ensure transparency and to protect the rights of the consumer. The consumer needs to be informed about which party is actually performing the fumigation, as this work involves significant health and safety concerns due to the nature of the chemicals used.

The written consent requirement serves to maintain accountability and ensures that the consumer has a clear understanding and agreement regarding who will be undertaking the critical task of fumigation. This practice aligns with regulatory standards intended to safeguard consumers and uphold the integrity of pest control services.

In contrast, verbal agreements, authorization from the state licensing board, or approvals from trained technicians do not adequately address the consumer's rights and consent in subcontracting arrangements. Verbal agreements can lead to misunderstandings and lack of formal documentation, while state board authorization does not directly involve consumer consent. Likewise, while having trained technicians is important for ensuring that the work is performed safely and effectively, it does not replace the necessity of obtaining explicit written permission from the consumer for subcontracting the work.