Which of the following is NOT a requirement for an establishment attached to a residence?

An additional restroom in the residence is not a requirement for an establishment attached to a residence. The regulations for salons and similar establishments typically emphasize the need for certain structural and accessibility standards, such as having a wall separating the salon from the residential area to ensure privacy and compliance with safety codes. An outside entrance is also commonly mandated to allow clients access without going through the residential part of the home, further distinguishing the business area from the personal living space. Having all equipment within the establishment is essential to maintain proper hygiene and operational standards, as it ensures that the business complies with sanitation practices. Therefore, while having appropriate facilities is important, the presence of an additional restroom specifically within the residence is not a mandated requirement, allowing the establishment to operate without imposing alterations to the personal living area beyond what is necessary for operational compliance.