Which of the following is not a ground for disciplinary action against a licensee?

Issuing a promissory note for the home improvement is not considered a ground for disciplinary action against a licensee. This is because the act of issuing a promissory note typically involves the financial arrangements made for paying for a service or product and does not directly relate to the conduct or ethical responsibilities of a home improvement salesperson.

In contrast, failing to complete work on time, misrepresenting the cost of materials, and violating building codes all reflect failures in professional standards and ethics. These actions can jeopardize the safety and satisfaction of clients, leading to justified disciplinary measures. By recognizing issuing a promissory note as a transactional aspect rather than a matter of ethics or professional conduct, it establishes a clear distinction from other serious infractions that warrant disciplinary action.