Which of the following actions can lead to the revocation of a Home Improvement license?

Advertising without a license is a serious violation in the home improvement industry. In Maryland, home improvement salespersons are required to have a valid license not only to conduct business but also to represent their services through any form of advertising. This regulation is in place to protect consumers by ensuring that they are engaging with legitimate, qualified professionals. Failing to adhere to licensing laws can lead to disciplinary actions, including the revocation of the salesperson's license.

The other actions mentioned, although relevant to the home improvement industry, do not necessarily violate regulations in the same manner. For instance, completing work ahead of schedule is typically seen as a positive attribute, providing a good customer experience. Providing warranties for services is also a standard practice that enhances trust and reliability. Using subcontractors for specialized work is common and accepted, as many projects require expertise beyond the primary contractor's scope. Therefore, these actions do not compromise the integrity or legality of the business in the same way that unlicensed advertising does.