It is unlawful for any person to:

1. 1. Manufacture manufactured homes or factory-built buildings in this state or for delivery or sale in this state unless such person is licensed as a manufacturer by the department.
2. 2. Engage in the business of installing manufactured homes, mobile homes or accessory structures unless such person is licensed as an installer by the department.
3. 3. Engage in the business of a salesperson of manufactured homes, mobile homes or factory-built buildings unless the person is licensed as a salesperson by the department.
4. 4. Engage in the business of contracting to sell any new or used unit regulated by this article or otherwise act in the capacity of a dealer or broker unless such person is licensed as a dealer or broker by the department.
5. 5. Make alterations to or reconstruct any manufactured homes or factory-built buildings unless such person is licensed or certified.